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Joining Galileo FNAV and FNAV telemetry decoders in a single GNURadio block

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This commit is contained in:
Javier Arribas 2018-08-27 18:05:19 +02:00
parent a7d28c20c1
commit 6d74370860
12 changed files with 828 additions and 1183 deletions
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2
src/algorithms/telemetry_decoder/adapters/galileo_e1b_telemetry_decoder.cc
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@ -55,7 +55,7 @@ GalileoE1BTelemetryDecoder::GalileoE1BTelemetryDecoder(ConfigurationInterface* c
dump_ = configuration->property(role + ".dump", false);
dump_filename_ = configuration->property(role + ".dump_filename", default_dump_filename);
// make telemetry decoder object
telemetry_decoder_ = galileo_e1b_make_telemetry_decoder_cc(satellite_, dump_); // TODO fix me
telemetry_decoder_ = galileo_make_telemetry_decoder_cc(satellite_, 1, dump_); //unified galileo decoder set to INAV (frame_type=1)
DLOG(INFO) << "telemetry_decoder(" << telemetry_decoder_->unique_id() << ")";
channel_ = 0;
if (in_streams_ > 1)

5
src/algorithms/telemetry_decoder/adapters/galileo_e1b_telemetry_decoder.h
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@ -36,7 +36,7 @@
#include "telemetry_decoder_interface.h"
#include "galileo_e1b_telemetry_decoder_cc.h"
#include "galileo_telemetry_decoder_cc.h"
#include "gnss_satellite.h"
#include <string>
@ -76,7 +76,6 @@ public:
void set_satellite(const Gnss_Satellite& satellite) override;
inline void set_channel(int channel) override { telemetry_decoder_->set_channel(channel); }
inline void reset() override
{
return;
@ -88,7 +87,7 @@ public:
}
private:
galileo_e1b_telemetry_decoder_cc_sptr telemetry_decoder_;
galileo_telemetry_decoder_cc_sptr telemetry_decoder_;
Gnss_Satellite satellite_;
int channel_;
bool dump_;

2
src/algorithms/telemetry_decoder/adapters/galileo_e5a_telemetry_decoder.cc
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@ -58,7 +58,7 @@ GalileoE5aTelemetryDecoder::GalileoE5aTelemetryDecoder(ConfigurationInterface* c
dump_ = configuration->property(role + ".dump", false);
dump_filename_ = configuration->property(role + ".dump_filename", default_dump_filename);
// make telemetry decoder object
telemetry_decoder_ = galileo_e5a_make_telemetry_decoder_cc(satellite_, dump_); // TODO fix me
telemetry_decoder_ = galileo_make_telemetry_decoder_cc(satellite_, 2, dump_); //unified galileo decoder set to FNAV (frame_type=2)
DLOG(INFO) << "telemetry_decoder(" << telemetry_decoder_->unique_id() << ")";
channel_ = 0;
if (in_streams_ > 1)

5
src/algorithms/telemetry_decoder/adapters/galileo_e5a_telemetry_decoder.h
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@ -37,7 +37,7 @@
#ifndef GNSS_SDR_GALILEO_E5A_TELEMETRY_DECODER_H_
#define GNSS_SDR_GALILEO_E5A_TELEMETRY_DECODER_H_
#include "galileo_e5a_telemetry_decoder_cc.h"
#include "galileo_telemetry_decoder_cc.h"
#include "telemetry_decoder_interface.h"
#include <string>
@ -76,7 +76,6 @@ public:
void set_satellite(const Gnss_Satellite& satellite) override;
inline void set_channel(int channel) override { telemetry_decoder_->set_channel(channel); }
inline void reset() override
{
return;
@ -88,7 +87,7 @@ public:
}
private:
galileo_e5a_telemetry_decoder_cc_sptr telemetry_decoder_;
galileo_telemetry_decoder_cc_sptr telemetry_decoder_;
Gnss_Satellite satellite_;
int channel_;
bool dump_;

3
src/algorithms/telemetry_decoder/gnuradio_blocks/CMakeLists.txt
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@ -20,11 +20,10 @@ set(TELEMETRY_DECODER_GR_BLOCKS_SOURCES
gps_l1_ca_telemetry_decoder_cc.cc
gps_l2c_telemetry_decoder_cc.cc
gps_l5_telemetry_decoder_cc.cc
galileo_e1b_telemetry_decoder_cc.cc
sbas_l1_telemetry_decoder_cc.cc
galileo_e5a_telemetry_decoder_cc.cc
glonass_l1_ca_telemetry_decoder_cc.cc
glonass_l2_ca_telemetry_decoder_cc.cc
galileo_telemetry_decoder_cc.cc
)
include_directories(

501
src/algorithms/telemetry_decoder/gnuradio_blocks/galileo_e1b_telemetry_decoder_cc.cc
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@ -1,501 +0,0 @@
/*!
* \file galileo_e1b_telemetry_decoder_cc.cc
* \brief Implementation of a Galileo INAV message demodulator block
* \author Mara Branzanti 2013. mara.branzanti(at)gmail.com
* \author Javier Arribas 2013. jarribas(at)cttc.es
*
* -------------------------------------------------------------------------
*
* Copyright (C) 2010-2018 (see AUTHORS file for a list of contributors)
*
* GNSS-SDR is a software defined Global Navigation
* Satellite Systems receiver
*
* This file is part of GNSS-SDR.
*
* GNSS-SDR is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GNSS-SDR is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNSS-SDR. If not, see <https://www.gnu.org/licenses/>.
*
* -------------------------------------------------------------------------
*/
#include "galileo_e1b_telemetry_decoder_cc.h"
#include "control_message_factory.h"
#include "convolutional.h"
#include "gnss_synchro.h"
#include <boost/lexical_cast.hpp>
#include <gnuradio/io_signature.h>
#include <glog/logging.h>
#include <volk_gnsssdr/volk_gnsssdr.h>
#include <iostream>
#define CRC_ERROR_LIMIT 6
using google::LogMessage;
galileo_e1b_telemetry_decoder_cc_sptr
galileo_e1b_make_telemetry_decoder_cc(const Gnss_Satellite &satellite, bool dump)
{
return galileo_e1b_telemetry_decoder_cc_sptr(new galileo_e1b_telemetry_decoder_cc(satellite, dump));
}
void galileo_e1b_telemetry_decoder_cc::viterbi_decoder(double *page_part_symbols, int32_t *page_part_bits)
{
Viterbi(page_part_bits, out0, state0, out1, state1,
page_part_symbols, KK, nn, DataLength);
}
void galileo_e1b_telemetry_decoder_cc::deinterleaver(int32_t rows, int32_t cols, double *in, double *out)
{
for (int32_t r = 0; r < rows; r++)
{
for (int32_t c = 0; c < cols; c++)
{
out[c * rows + r] = in[r * cols + c];
}
}
}
galileo_e1b_telemetry_decoder_cc::galileo_e1b_telemetry_decoder_cc(
const Gnss_Satellite &satellite,
bool dump) : gr::block("galileo_e1b_telemetry_decoder_cc", gr::io_signature::make(1, 1, sizeof(Gnss_Synchro)),
gr::io_signature::make(1, 1, sizeof(Gnss_Synchro)))
{
// Ephemeris data port out
this->message_port_register_out(pmt::mp("telemetry"));
// initialize internal vars
d_dump = dump;
d_satellite = Gnss_Satellite(satellite.get_system(), satellite.get_PRN());
LOG(INFO) << "Initializing GALILEO E1B TELEMETRY PROCESSING";
d_samples_per_symbol = (Galileo_E1_CODE_CHIP_RATE_HZ / Galileo_E1_B_CODE_LENGTH_CHIPS) / Galileo_E1_B_SYMBOL_RATE_BPS;
// set the preamble
uint16_t preambles_bits[GALILEO_INAV_PREAMBLE_LENGTH_BITS] = GALILEO_INAV_PREAMBLE;
d_symbols_per_preamble = GALILEO_INAV_PREAMBLE_LENGTH_BITS * d_samples_per_symbol;
memcpy(static_cast<uint16_t *>(this->d_preambles_bits), static_cast<uint16_t *>(preambles_bits), GALILEO_INAV_PREAMBLE_LENGTH_BITS * sizeof(uint16_t));
// preamble bits to sampled symbols
d_preambles_symbols = static_cast<int32_t *>(volk_gnsssdr_malloc(d_symbols_per_preamble * sizeof(int32_t), volk_gnsssdr_get_alignment()));
int32_t n = 0;
for (int32_t i = 0; i < GALILEO_INAV_PREAMBLE_LENGTH_BITS; i++)
{
for (uint32_t j = 0; j < d_samples_per_symbol; j++)
{
if (d_preambles_bits[i] == 1)
{
d_preambles_symbols[n] = 1;
}
else
{
d_preambles_symbols[n] = -1;
}
n++;
}
}
d_sample_counter = 0ULL;
d_stat = 0;
d_preamble_index = 0ULL;
d_flag_frame_sync = false;
d_flag_parity = false;
d_TOW_at_current_symbol_ms = 0;
d_TOW_at_Preamble_ms = 0;
delta_t = 0;
d_CRC_error_counter = 0;
flag_even_word_arrived = 0;
d_flag_preamble = false;
d_channel = 0;
flag_TOW_set = false;
// vars for Viterbi decoder
int32_t max_states = 1 << mm; // 2^mm
g_encoder[0] = 121; // Polynomial G1
g_encoder[1] = 91; // Polynomial G2
out0 = static_cast<int32_t *>(volk_gnsssdr_malloc(max_states * sizeof(int32_t), volk_gnsssdr_get_alignment()));
out1 = static_cast<int32_t *>(volk_gnsssdr_malloc(max_states * sizeof(int32_t), volk_gnsssdr_get_alignment()));
state0 = static_cast<int32_t *>(volk_gnsssdr_malloc(max_states * sizeof(int32_t), volk_gnsssdr_get_alignment()));
state1 = static_cast<int32_t *>(volk_gnsssdr_malloc(max_states * sizeof(int32_t), volk_gnsssdr_get_alignment()));
// create appropriate transition matrices
nsc_transit(out0, state0, 0, g_encoder, KK, nn);
nsc_transit(out1, state1, 1, g_encoder, KK, nn);
}
galileo_e1b_telemetry_decoder_cc::~galileo_e1b_telemetry_decoder_cc()
{
volk_gnsssdr_free(d_preambles_symbols);
volk_gnsssdr_free(out0);
volk_gnsssdr_free(out1);
volk_gnsssdr_free(state0);
volk_gnsssdr_free(state1);
if (d_dump_file.is_open() == true)
{
try
{
d_dump_file.close();
}
catch (const std::exception &ex)
{
LOG(WARNING) << "Exception in destructor closing the dump file " << ex.what();
}
}
}
void galileo_e1b_telemetry_decoder_cc::decode_word(double *page_part_symbols, int32_t frame_length)
{
// 1. De-interleave
double *page_part_symbols_deint = static_cast<double *>(volk_gnsssdr_malloc(frame_length * sizeof(double), volk_gnsssdr_get_alignment()));
deinterleaver(GALILEO_INAV_INTERLEAVER_ROWS, GALILEO_INAV_INTERLEAVER_COLS, page_part_symbols, page_part_symbols_deint);
// 2. Viterbi decoder
// 2.1 Take into account the NOT gate in G2 polynomial (Galileo ICD Figure 13, FEC encoder)
// 2.2 Take into account the possible inversion of the polarity due to PLL lock at 180º
for (int32_t i = 0; i < frame_length; i++)
{
if ((i + 1) % 2 == 0)
{
page_part_symbols_deint[i] = -page_part_symbols_deint[i];
}
}
int32_t *page_part_bits = static_cast<int32_t *>(volk_gnsssdr_malloc((frame_length / 2) * sizeof(int32_t), volk_gnsssdr_get_alignment()));
viterbi_decoder(page_part_symbols_deint, page_part_bits);
volk_gnsssdr_free(page_part_symbols_deint);
// 3. Call the Galileo page decoder
std::string page_String;
for (int32_t i = 0; i < (frame_length / 2); i++)
{
if (page_part_bits[i] > 0)
{
page_String.push_back('1');
}
else
{
page_String.push_back('0');
}
}
if (page_part_bits[0] == 1)
{
// DECODE COMPLETE WORD (even + odd) and TEST CRC
d_nav.split_page(page_String, flag_even_word_arrived);
if (d_nav.flag_CRC_test == true)
{
LOG(INFO) << "Galileo E1 CRC correct in channel " << d_channel << " from satellite " << d_satellite;
//std::cout << "Galileo E1 CRC correct on channel " << d_channel << " from satellite " << d_satellite << std::endl;
}
else
{
std::cout << "Galileo E1 CRC error in channel " << d_channel << " from satellite " << d_satellite << std::endl;
LOG(INFO) << "Galileo E1 CRC error in channel " << d_channel << " from satellite " << d_satellite;
}
flag_even_word_arrived = 0;
}
else
{
// STORE HALF WORD (even page)
d_nav.split_page(page_String.c_str(), flag_even_word_arrived);
flag_even_word_arrived = 1;
}
volk_gnsssdr_free(page_part_bits);
// 4. Push the new navigation data to the queues
if (d_nav.have_new_ephemeris() == true)
{
// get object for this SV (mandatory)
std::shared_ptr<Galileo_Ephemeris> tmp_obj = std::make_shared<Galileo_Ephemeris>(d_nav.get_ephemeris());
std::cout << "New Galileo E1 I/NAV message received in channel " << d_channel << ": ephemeris from satellite " << d_satellite << std::endl;
this->message_port_pub(pmt::mp("telemetry"), pmt::make_any(tmp_obj));
}
if (d_nav.have_new_iono_and_GST() == true)
{
// get object for this SV (mandatory)
std::shared_ptr<Galileo_Iono> tmp_obj = std::make_shared<Galileo_Iono>(d_nav.get_iono());
std::cout << "New Galileo E1 I/NAV message received in channel " << d_channel << ": iono/GST model parameters from satellite " << d_satellite << std::endl;
this->message_port_pub(pmt::mp("telemetry"), pmt::make_any(tmp_obj));
}
if (d_nav.have_new_utc_model() == true)
{
// get object for this SV (mandatory)
std::shared_ptr<Galileo_Utc_Model> tmp_obj = std::make_shared<Galileo_Utc_Model>(d_nav.get_utc_model());
std::cout << "New Galileo E1 I/NAV message received in channel " << d_channel << ": UTC model parameters from satellite " << d_satellite << std::endl;
this->message_port_pub(pmt::mp("telemetry"), pmt::make_any(tmp_obj));
}
if (d_nav.have_new_almanac() == true)
{
std::shared_ptr<Galileo_Almanac> tmp_obj = std::make_shared<Galileo_Almanac>(d_nav.get_almanac());
this->message_port_pub(pmt::mp("telemetry"), pmt::make_any(tmp_obj));
//debug
std::cout << "Galileo E1 I/NAV almanac received in channel " << d_channel << " from satellite " << d_satellite << std::endl;
DLOG(INFO) << "GPS_to_Galileo time conversion:";
DLOG(INFO) << "A0G=" << tmp_obj->A_0G_10;
DLOG(INFO) << "A1G=" << tmp_obj->A_1G_10;
DLOG(INFO) << "T0G=" << tmp_obj->t_0G_10;
DLOG(INFO) << "WN_0G_10=" << tmp_obj->WN_0G_10;
DLOG(INFO) << "Current parameters:";
DLOG(INFO) << "d_TOW_at_current_symbol_ms=" << d_TOW_at_current_symbol_ms;
DLOG(INFO) << "d_nav.WN_0=" << d_nav.WN_0;
delta_t = tmp_obj->A_0G_10 + tmp_obj->A_1G_10 * (static_cast<double>(d_TOW_at_current_symbol_ms) / 1000.0 - tmp_obj->t_0G_10 + 604800 * (fmod((d_nav.WN_0 - tmp_obj->WN_0G_10), 64)));
DLOG(INFO) << "delta_t=" << delta_t << "[s]";
}
}
void galileo_e1b_telemetry_decoder_cc::set_satellite(const Gnss_Satellite &satellite)
{
d_satellite = Gnss_Satellite(satellite.get_system(), satellite.get_PRN());
DLOG(INFO) << "Setting decoder Finite State Machine to satellite " << d_satellite;
DLOG(INFO) << "Navigation Satellite set to " << d_satellite;
}
void galileo_e1b_telemetry_decoder_cc::set_channel(int32_t channel)
{
d_channel = channel;
LOG(INFO) << "Navigation channel set to " << channel;
// ############# ENABLE DATA FILE LOG #################
if (d_dump == true)
{
if (d_dump_file.is_open() == false)
{
try
{
d_dump_filename = "telemetry";
d_dump_filename.append(boost::lexical_cast<std::string>(d_channel));
d_dump_filename.append(".dat");
d_dump_file.exceptions(std::ifstream::failbit | std::ifstream::badbit);
d_dump_file.open(d_dump_filename.c_str(), std::ios::out | std::ios::binary);
LOG(INFO) << "Telemetry decoder dump enabled on channel " << d_channel << " Log file: " << d_dump_filename.c_str();
}
catch (const std::ifstream::failure &e)
{
LOG(WARNING) << "channel " << d_channel << " Exception opening trk dump file " << e.what();
}
}
}
}
int galileo_e1b_telemetry_decoder_cc::general_work(int noutput_items __attribute__((unused)), gr_vector_int &ninput_items __attribute__((unused)),
gr_vector_const_void_star &input_items, gr_vector_void_star &output_items)
{
int32_t corr_value = 0;
int32_t preamble_diff = 0;
Gnss_Synchro **out = reinterpret_cast<Gnss_Synchro **>(&output_items[0]); // Get the output buffer pointer
const Gnss_Synchro **in = reinterpret_cast<const Gnss_Synchro **>(&input_items[0]); // Get the input buffer pointer
Gnss_Synchro current_symbol; // structure to save the synchronization information and send the output object to the next block
// 1. Copy the current tracking output
current_symbol = in[0][0];
d_symbol_history.push_back(current_symbol); // add new symbol to the symbol queue
d_sample_counter++; // count for the processed samples
consume_each(1);
d_flag_preamble = false;
uint32_t required_symbols = static_cast<uint32_t>(GALILEO_INAV_PAGE_SYMBOLS) + static_cast<uint32_t>(d_symbols_per_preamble);
if (d_symbol_history.size() > required_symbols)
{
// TODO Optimize me!
// ******* preamble correlation ********
for (int32_t i = 0; i < d_symbols_per_preamble; i++)
{
if (d_symbol_history.at(i).Prompt_I < 0) // symbols clipping
{
corr_value -= d_preambles_symbols[i];
}
else
{
corr_value += d_preambles_symbols[i];
}
}
}
// ******* frame sync ******************
if (d_stat == 0) // no preamble information
{
if (abs(corr_value) >= d_symbols_per_preamble)
{
d_preamble_index = d_sample_counter; // record the preamble sample stamp
LOG(INFO) << "Preamble detection for Galileo satellite " << this->d_satellite;
d_stat = 1; // enter into frame pre-detection status
}
}
else if (d_stat == 1) // possible preamble lock
{
if (abs(corr_value) >= d_symbols_per_preamble)
{
// check preamble separation
preamble_diff = static_cast<int32_t>(d_sample_counter - d_preamble_index);
if (abs(preamble_diff - GALILEO_INAV_PREAMBLE_PERIOD_SYMBOLS) == 0)
{
// try to decode frame
LOG(INFO) << "Starting page decoder for Galileo satellite " << this->d_satellite;
d_preamble_index = d_sample_counter; // record the preamble sample stamp
d_stat = 2;
}
else
{
if (preamble_diff > GALILEO_INAV_PREAMBLE_PERIOD_SYMBOLS)
{
d_stat = 0; // start again
}
}
}
}
else if (d_stat == 2)
{
if (d_sample_counter == d_preamble_index + static_cast<uint64_t>(GALILEO_INAV_PREAMBLE_PERIOD_SYMBOLS))
{
// NEW Galileo page part is received
// 0. fetch the symbols into an array
int32_t frame_length = GALILEO_INAV_PAGE_PART_SYMBOLS - d_symbols_per_preamble;
double *page_part_symbols = static_cast<double *>(volk_gnsssdr_malloc(frame_length * sizeof(double), volk_gnsssdr_get_alignment()));
for (int32_t i = 0; i < frame_length; i++)
{
if (corr_value > 0)
{
page_part_symbols[i] = d_symbol_history.at(i + d_symbols_per_preamble).Prompt_I; // because last symbol of the preamble is just received now!
}
else
{
page_part_symbols[i] = -d_symbol_history.at(i + d_symbols_per_preamble).Prompt_I; // because last symbol of the preamble is just received now!
}
}
// call the decoder
decode_word(page_part_symbols, frame_length);
if (d_nav.flag_CRC_test == true)
{
d_CRC_error_counter = 0;
d_flag_preamble = true; // valid preamble indicator (initialized to false every work())
d_preamble_index = d_sample_counter; // record the preamble sample stamp (t_P)
if (!d_flag_frame_sync)
{
d_flag_frame_sync = true;
DLOG(INFO) << " Frame sync SAT " << this->d_satellite << " with preamble start at "
<< d_symbol_history.at(0).Tracking_sample_counter << " [samples]";
}
}
else
{
d_CRC_error_counter++;
d_preamble_index = d_sample_counter; // record the preamble sample stamp
if (d_CRC_error_counter > CRC_ERROR_LIMIT)
{
LOG(INFO) << "Lost of frame sync SAT " << this->d_satellite;
d_flag_frame_sync = false;
d_stat = 0;
d_TOW_at_current_symbol_ms = 0;
d_TOW_at_Preamble_ms = 0;
d_nav.flag_TOW_set = false;
}
}
volk_gnsssdr_free(page_part_symbols);
}
}
// UPDATE GNSS SYNCHRO DATA
// 2. Add the telemetry decoder information
if (this->d_flag_preamble == true and d_nav.flag_TOW_set == true)
// update TOW at the preamble instant
{
if (d_nav.flag_TOW_5 == true) // page 5 arrived and decoded, so we are in the odd page (since Tow refers to the even page, we have to add 1 sec)
{
// TOW_5 refers to the even preamble, but when we decode it we are in the odd part, so 1 second later plus the decoding delay
d_TOW_at_Preamble_ms = static_cast<uint32_t>(d_nav.TOW_5 * 1000.0);
d_TOW_at_current_symbol_ms = d_TOW_at_Preamble_ms + static_cast<uint32_t>(GALILEO_INAV_PAGE_PART_MS + (required_symbols + 1) * GALILEO_E1_CODE_PERIOD_MS);
d_nav.flag_TOW_5 = false;
}
else if (d_nav.flag_TOW_6 == true) // page 6 arrived and decoded, so we are in the odd page (since Tow refers to the even page, we have to add 1 sec)
{
// TOW_6 refers to the even preamble, but when we decode it we are in the odd part, so 1 second later plus the decoding delay
d_TOW_at_Preamble_ms = static_cast<uint32_t>(d_nav.TOW_6 * 1000.0);
d_TOW_at_current_symbol_ms = d_TOW_at_Preamble_ms + static_cast<uint32_t>(GALILEO_INAV_PAGE_PART_MS + (required_symbols + 1) * GALILEO_E1_CODE_PERIOD_MS);
d_nav.flag_TOW_6 = false;
}
else
{
// this page has no timing information
d_TOW_at_current_symbol_ms += static_cast<uint32_t>(GALILEO_E1_CODE_PERIOD_MS); // + GALILEO_INAV_PAGE_PART_SYMBOLS*GALILEO_E1_CODE_PERIOD;
}
}
else // if there is not a new preamble, we define the TOW of the current symbol
{
if (d_nav.flag_TOW_set == true)
{
d_TOW_at_current_symbol_ms += static_cast<uint32_t>(GALILEO_E1_CODE_PERIOD_MS);
}
}
// remove used symbols from history
// todo: Use circular buffer here
if (d_symbol_history.size() > required_symbols)
{
d_symbol_history.pop_front();
}
if (d_nav.flag_TOW_set)
{
if (d_nav.flag_GGTO_1 == true and d_nav.flag_GGTO_2 == true and d_nav.flag_GGTO_3 == true and d_nav.flag_GGTO_4 == true) // all GGTO parameters arrived
{
delta_t = d_nav.A_0G_10 + d_nav.A_1G_10 * (static_cast<double>(d_TOW_at_current_symbol_ms) / 1000.0 - d_nav.t_0G_10 + 604800.0 * (fmod((d_nav.WN_0 - d_nav.WN_0G_10), 64.0)));
}
current_symbol.Flag_valid_word = d_nav.flag_TOW_set;
current_symbol.TOW_at_current_symbol_ms = d_TOW_at_current_symbol_ms;
// todo: Galileo to GPS time conversion should be moved to observable block.
// current_symbol.TOW_at_current_symbol_ms -= delta_t; //Galileo to GPS TOW
if (d_dump == true)
{
// MULTIPLEXED FILE RECORDING - Record results to file
try
{
double tmp_double;
uint64_t tmp_ulong_int;
tmp_double = static_cast<double>(d_TOW_at_current_symbol_ms) / 1000.0;
d_dump_file.write(reinterpret_cast<char *>(&tmp_double), sizeof(double));
tmp_ulong_int = current_symbol.Tracking_sample_counter;
d_dump_file.write(reinterpret_cast<char *>(&tmp_ulong_int), sizeof(uint64_t));
tmp_double = static_cast<double>(d_TOW_at_Preamble_ms) / 1000.0;
d_dump_file.write(reinterpret_cast<char *>(&tmp_double), sizeof(double));
}
catch (const std::ifstream::failure &e)
{
LOG(WARNING) << "Exception writing observables dump file " << e.what();
}
}
// 3. Make the output (copy the object contents to the GNURadio reserved memory)
*out[0] = current_symbol;
return 1;
}
else
{
return 0;
}
}

513
src/algorithms/telemetry_decoder/gnuradio_blocks/galileo_e5a_telemetry_decoder_cc.cc
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@ -1,513 +0,0 @@
/*!
* \file galileo_e5a_telemetry_decoder_cc.cc
* \brief Implementation of a Galileo FNAV message demodulator block
* \author Marc Sales, 2014. marcsales92(at)gmail.com
* Javier Arribas, 2017. jarribas(at)cttc.es
* \based on work from:
* <ul>
* <li> Javier Arribas, 2011. jarribas(at)cttc.es
* </ul>
*
*
* -------------------------------------------------------------------------
*
* Copyright (C) 2010-2018 (see AUTHORS file for a list of contributors)
*
* GNSS-SDR is a software defined Global Navigation
* Satellite Systems receiver
*
* This file is part of GNSS-SDR.
*
* GNSS-SDR is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GNSS-SDR is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNSS-SDR. If not, see <https://www.gnu.org/licenses/>.
*
* -------------------------------------------------------------------------
*/
#include "galileo_e5a_telemetry_decoder_cc.h"
#include "control_message_factory.h"
#include "convolutional.h"
#include "display.h"
#include <boost/lexical_cast.hpp>
#include <gnuradio/io_signature.h>
#include <glog/logging.h>
#include <volk_gnsssdr/volk_gnsssdr.h>
#include <cmath>
#include <iostream>
#define GALILEO_E5a_CRC_ERROR_LIMIT 6
using google::LogMessage;
galileo_e5a_telemetry_decoder_cc_sptr
galileo_e5a_make_telemetry_decoder_cc(const Gnss_Satellite &satellite, bool dump)
{
return galileo_e5a_telemetry_decoder_cc_sptr(new galileo_e5a_telemetry_decoder_cc(satellite, dump));
}
void galileo_e5a_telemetry_decoder_cc::viterbi_decoder(double *page_part_symbols, int32_t *page_part_bits)
{
Viterbi(page_part_bits, out0, state0, out1, state1,
page_part_symbols, KK, nn, DataLength);
}
void galileo_e5a_telemetry_decoder_cc::deinterleaver(int32_t rows, int32_t cols, double *in, double *out)
{
for (int32_t r = 0; r < rows; r++)
{
for (int32_t c = 0; c < cols; c++)
{
out[c * rows + r] = in[r * cols + c];
}
}
}
void galileo_e5a_telemetry_decoder_cc::decode_word(double *page_symbols, int32_t frame_length)
{
// 1. De-interleave
double *page_symbols_deint = static_cast<double *>(volk_gnsssdr_malloc(frame_length * sizeof(double), volk_gnsssdr_get_alignment()));
deinterleaver(GALILEO_FNAV_INTERLEAVER_ROWS, GALILEO_FNAV_INTERLEAVER_COLS, page_symbols, page_symbols_deint);
// 2. Viterbi decoder
// 2.1 Take into account the NOT gate in G2 polynomial (Galileo ICD Figure 13, FEC encoder)
// 2.2 Take into account the possible inversion of the polarity due to PLL lock at 180<38>
for (int32_t i = 0; i < frame_length; i++)
{
if ((i + 1) % 2 == 0)
{
page_symbols_deint[i] = -page_symbols_deint[i];
}
}
int32_t *page_bits = static_cast<int32_t *>(volk_gnsssdr_malloc((frame_length / 2) * sizeof(int32_t), volk_gnsssdr_get_alignment()));
viterbi_decoder(page_symbols_deint, page_bits);
volk_gnsssdr_free(page_symbols_deint);
// 3. Call the Galileo page decoder
std::string page_String;
for (int32_t i = 0; i < frame_length; i++)
{
if (page_bits[i] > 0)
{
page_String.push_back('1');
}
else
{
page_String.push_back('0');
}
}
volk_gnsssdr_free(page_bits);
// DECODE COMPLETE WORD (even + odd) and TEST CRC
d_nav.split_page(page_String);
if (d_nav.flag_CRC_test == true)
{
LOG(INFO) << "Galileo E5a CRC correct in channel " << d_channel << " from satellite " << d_satellite;
}
else
{
std::cout << "Galileo E5a CRC error in channel " << d_channel << " from satellite " << d_satellite << std::endl;
LOG(INFO) << "Galileo E5a CRC error in channel " << d_channel << " from satellite " << d_satellite;
}
// 4. Push the new navigation data to the queues
if (d_nav.have_new_ephemeris() == true)
{
std::shared_ptr<Galileo_Ephemeris> tmp_obj = std::make_shared<Galileo_Ephemeris>(d_nav.get_ephemeris());
std::cout << TEXT_MAGENTA << "New Galileo E5a F/NAV message received in channel " << d_channel << ": ephemeris from satellite " << d_satellite << TEXT_RESET << std::endl;
this->message_port_pub(pmt::mp("telemetry"), pmt::make_any(tmp_obj));
}
if (d_nav.have_new_iono_and_GST() == true)
{
std::shared_ptr<Galileo_Iono> tmp_obj = std::make_shared<Galileo_Iono>(d_nav.get_iono());
std::cout << TEXT_MAGENTA << "New Galileo E5a F/NAV message received in channel " << d_channel << ": iono/GST model parameters from satellite " << d_satellite << TEXT_RESET << std::endl;
this->message_port_pub(pmt::mp("telemetry"), pmt::make_any(tmp_obj));
}
if (d_nav.have_new_utc_model() == true)
{
std::shared_ptr<Galileo_Utc_Model> tmp_obj = std::make_shared<Galileo_Utc_Model>(d_nav.get_utc_model());
std::cout << TEXT_MAGENTA << "New Galileo E5a F/NAV message received in channel " << d_channel << ": UTC model parameters from satellite " << d_satellite << TEXT_RESET << std::endl;
this->message_port_pub(pmt::mp("telemetry"), pmt::make_any(tmp_obj));
}
}
galileo_e5a_telemetry_decoder_cc::galileo_e5a_telemetry_decoder_cc(
const Gnss_Satellite &satellite, bool dump) : gr::block("galileo_e5a_telemetry_decoder_cc",
gr::io_signature::make(1, 1, sizeof(Gnss_Synchro)),
gr::io_signature::make(1, 1, sizeof(Gnss_Synchro)))
{
// Ephemeris data port out
this->message_port_register_out(pmt::mp("telemetry"));
// initialize internal vars
d_dump = dump;
d_satellite = Gnss_Satellite(satellite.get_system(), satellite.get_PRN());
// set the preamble
for (int32_t i = 0; i < GALILEO_FNAV_PREAMBLE_LENGTH_BITS; i++)
{
if (GALILEO_FNAV_PREAMBLE.at(i) == '0')
{
d_preambles_bits[i] = 1;
}
else
{
d_preambles_bits[i] = -1;
}
}
for (int32_t i = 0; i < GALILEO_FNAV_PREAMBLE_LENGTH_BITS; i++)
{
for (int32_t k = 0; k < GALILEO_FNAV_CODES_PER_SYMBOL; k++)
{
d_preamble_samples[(i * GALILEO_FNAV_CODES_PER_SYMBOL) + k] = d_preambles_bits[i];
}
}
d_sample_counter = 0ULL;
d_stat = 0;
corr_value = 0;
d_flag_preamble = false;
d_preamble_index = 0ULL;
d_flag_frame_sync = false;
d_TOW_at_current_symbol_ms = 0;
d_TOW_at_Preamble_ms = 0;
flag_TOW_set = false;
d_CRC_error_counter = 0;
d_channel = 0;
delta_t = 0.0;
d_symbol_counter = 0;
d_prompt_acum = 0.0;
flag_bit_start = true;
new_symbol = false;
required_symbols = GALILEO_FNAV_SYMBOLS_PER_PAGE + GALILEO_FNAV_PREAMBLE_LENGTH_BITS;
// vars for Viterbi decoder
int32_t max_states = 1 << mm; // 2^mm
g_encoder[0] = 121; // Polynomial G1
g_encoder[1] = 91; // Polynomial G2
out0 = static_cast<int32_t *>(volk_gnsssdr_malloc(max_states * sizeof(int32_t), volk_gnsssdr_get_alignment()));
out1 = static_cast<int32_t *>(volk_gnsssdr_malloc(max_states * sizeof(int32_t), volk_gnsssdr_get_alignment()));
state0 = static_cast<int32_t *>(volk_gnsssdr_malloc(max_states * sizeof(int32_t), volk_gnsssdr_get_alignment()));
state1 = static_cast<int32_t *>(volk_gnsssdr_malloc(max_states * sizeof(int32_t), volk_gnsssdr_get_alignment()));
// create appropriate transition matrices
nsc_transit(out0, state0, 0, g_encoder, KK, nn);
nsc_transit(out1, state1, 1, g_encoder, KK, nn);
}
galileo_e5a_telemetry_decoder_cc::~galileo_e5a_telemetry_decoder_cc()
{
volk_gnsssdr_free(out0);
volk_gnsssdr_free(out1);
volk_gnsssdr_free(state0);
volk_gnsssdr_free(state1);
if (d_dump_file.is_open() == true)
{
try
{
d_dump_file.close();
}
catch (const std::exception &ex)
{
LOG(WARNING) << "Exception in destructor closing the dump file " << ex.what();
}
}
}
void galileo_e5a_telemetry_decoder_cc::set_satellite(const Gnss_Satellite &satellite)
{
d_satellite = Gnss_Satellite(satellite.get_system(), satellite.get_PRN());
DLOG(INFO) << "Setting decoder Finite State Machine to satellite " << d_satellite;
DLOG(INFO) << "Navigation Satellite set to " << d_satellite;
}
void galileo_e5a_telemetry_decoder_cc::set_channel(int32_t channel)
{
d_channel = channel;
LOG(INFO) << "Navigation channel set to " << channel;
// Enable data file logging
if (d_dump == true)
{
if (d_dump_file.is_open() == false)
{
try
{
d_dump_filename = "telemetry";
d_dump_filename.append(boost::lexical_cast<std::string>(d_channel));
d_dump_filename.append(".dat");
d_dump_file.exceptions(std::ifstream::failbit | std::ifstream::badbit);
d_dump_file.open(d_dump_filename.c_str(), std::ios::out | std::ios::binary);
LOG(INFO) << "Telemetry decoder dump enabled on channel " << d_channel << " Log file: " << d_dump_filename.c_str();
}
catch (const std::ifstream::failure &e)
{
LOG(WARNING) << "channel " << d_channel << " Exception opening trk dump file " << e.what();
}
}
}
}
int galileo_e5a_telemetry_decoder_cc::general_work(int noutput_items __attribute__((unused)), gr_vector_int &ninput_items __attribute__((unused)),
gr_vector_const_void_star &input_items, gr_vector_void_star &output_items)
{
int32_t preamble_diff = 0;
Gnss_Synchro *out = reinterpret_cast<Gnss_Synchro *>(output_items[0]); // Get the output buffer pointer
const Gnss_Synchro *in = reinterpret_cast<const Gnss_Synchro *>(input_items[0]); // Get the input buffer pointer
// 1. Copy the current tracking output
Gnss_Synchro current_sample = in[0];
d_symbol_counter++;
if (flag_bit_start)
{
d_prompt_acum += current_sample.Prompt_I;
if (d_symbol_counter == GALILEO_FNAV_CODES_PER_SYMBOL)
{
current_sample.Prompt_I = d_prompt_acum / static_cast<double>(GALILEO_FNAV_CODES_PER_SYMBOL);
d_symbol_history.push_back(current_sample); // add new symbol to the symbol queue
d_prompt_acum = 0.0;
d_symbol_counter = 0;
new_symbol = true;
}
}
else
{
if (current_sample.Prompt_I < 0.0)
{
d_preamble_init.push_back(1);
}
else
{
d_preamble_init.push_back(-1);
}
if (d_preamble_init.size() == GALILEO_FNAV_CODES_PER_PREAMBLE)
{
std::deque<int32_t>::iterator iter;
int32_t k = 0;
corr_value = 0;
for (iter = d_preamble_init.begin(); iter != d_preamble_init.end(); iter++)
{
corr_value += *iter * d_preamble_samples[k];
k++;
}
if (abs(corr_value) == GALILEO_FNAV_CODES_PER_PREAMBLE)
{
d_symbol_counter = 0;
flag_bit_start = true;
corr_value = 0;
d_preamble_init.clear();
d_symbol_history.clear();
LOG(INFO) << "Bit start sync for Galileo E5a satellite " << d_satellite;
}
else
{
d_preamble_init.pop_front();
}
}
}
d_sample_counter++; // count for the processed samples
consume_each(1);
d_flag_preamble = false;
if ((d_symbol_history.size() > required_symbols) && new_symbol)
{
// ****************** Preamble orrelation ******************
corr_value = 0;
for (int32_t i = 0; i < GALILEO_FNAV_PREAMBLE_LENGTH_BITS; i++)
{
if (d_symbol_history.at(i).Prompt_I < 0.0) // symbols clipping
{
corr_value -= d_preambles_bits[i];
}
else
{
corr_value += d_preambles_bits[i];
}
}
}
// ****************** Frame sync ******************
if ((d_stat == 0) && new_symbol) // no preamble information
{
if (abs(corr_value) == GALILEO_FNAV_PREAMBLE_LENGTH_BITS)
{
d_preamble_index = d_sample_counter; // record the preamble sample stamp
LOG(INFO) << "Preamble detection for Galileo E5a satellite " << d_satellite;
d_stat = 1; // enter into frame pre-detection status
}
}
else if ((d_stat == 1) && new_symbol) // possible preamble lock
{
if (abs(corr_value) == GALILEO_FNAV_PREAMBLE_LENGTH_BITS)
{
// check preamble separation
preamble_diff = static_cast<int32_t>(d_sample_counter - d_preamble_index);
if (preamble_diff == GALILEO_FNAV_CODES_PER_PAGE)
{
// try to decode frame
LOG(INFO) << "Starting page decoder for Galileo E5a satellite " << d_satellite;
d_preamble_index = d_sample_counter; // record the preamble sample stamp
d_stat = 2;
}
else if (preamble_diff > GALILEO_FNAV_CODES_PER_PAGE)
{
d_stat = 0; // start again
flag_bit_start = false;
LOG(INFO) << "Preamble diff = " << preamble_diff;
}
}
}
else if ((d_stat == 2) && new_symbol)
{
if (d_sample_counter == (d_preamble_index + static_cast<uint64_t>(GALILEO_FNAV_CODES_PER_PAGE)))
{
// NEW Galileo page part is received
// 0. fetch the symbols into an array
int32_t frame_length = GALILEO_FNAV_SYMBOLS_PER_PAGE - GALILEO_FNAV_PREAMBLE_LENGTH_BITS;
double corr_sign = 0.0;
if (corr_value > 0)
{
corr_sign = -1.0;
}
else
{
corr_sign = 1.0;
}
for (int32_t i = 0; i < frame_length; i++)
{
page_symbols[i] = corr_sign * d_symbol_history.at(i + GALILEO_FNAV_PREAMBLE_LENGTH_BITS).Prompt_I; // because last symbol of the preamble is just received now!
}
// call the decoder
decode_word(page_symbols, frame_length);
if (d_nav.flag_CRC_test == true)
{
d_CRC_error_counter = 0;
d_flag_preamble = true; // valid preamble indicator (initialized to false every work())
d_preamble_index = d_sample_counter; // record the preamble sample stamp (t_P)
if (!d_flag_frame_sync)
{
d_flag_frame_sync = true;
DLOG(INFO) << " Frame sync SAT " << this->d_satellite << " with preamble start at "
<< d_symbol_history.at(0).Tracking_sample_counter << " [samples]";
}
}
else
{
d_CRC_error_counter++;
d_preamble_index = d_sample_counter; // record the preamble sample stamp
if (d_CRC_error_counter > GALILEO_E5A_CRC_ERROR_LIMIT)
{
LOG(INFO) << "Lost of frame sync SAT " << this->d_satellite;
d_flag_frame_sync = false;
d_stat = 0;
flag_bit_start = false;
d_nav.flag_TOW_set = false;
d_TOW_at_current_symbol_ms = 0;
d_TOW_at_Preamble_ms = 0;
}
}
}
}
new_symbol = false;
// UPDATE GNSS SYNCHRO DATA
// Add the telemetry decoder information
if (d_flag_preamble and d_nav.flag_TOW_set)
// update TOW at the preamble instant
// We expect a preamble each 10 seconds (FNAV page period)
{
if (d_nav.flag_TOW_1 == true)
{
d_TOW_at_Preamble_ms = static_cast<uint32_t>(d_nav.FNAV_TOW_1 * 1000.0);
d_TOW_at_current_symbol_ms = d_TOW_at_Preamble_ms + static_cast<uint32_t>((GALILEO_FNAV_CODES_PER_PAGE + GALILEO_FNAV_CODES_PER_PREAMBLE) * GALILEO_E5a_CODE_PERIOD_MS);
d_nav.flag_TOW_1 = false;
}
else if (d_nav.flag_TOW_2 == true)
{
d_TOW_at_Preamble_ms = static_cast<uint32_t>(d_nav.FNAV_TOW_2 * 1000.0);
d_TOW_at_current_symbol_ms = d_TOW_at_Preamble_ms + static_cast<uint32_t>((GALILEO_FNAV_CODES_PER_PAGE + GALILEO_FNAV_CODES_PER_PREAMBLE) * GALILEO_E5a_CODE_PERIOD_MS);
d_nav.flag_TOW_2 = false;
}
else if (d_nav.flag_TOW_3 == true)
{
d_TOW_at_Preamble_ms = static_cast<uint32_t>(d_nav.FNAV_TOW_3 * 1000.0);
d_TOW_at_current_symbol_ms = d_TOW_at_Preamble_ms + static_cast<uint32_t>((GALILEO_FNAV_CODES_PER_PAGE + GALILEO_FNAV_CODES_PER_PREAMBLE) * GALILEO_E5a_CODE_PERIOD_MS);
d_nav.flag_TOW_3 = false;
}
else if (d_nav.flag_TOW_4 == true)
{
d_TOW_at_Preamble_ms = static_cast<uint32_t>(d_nav.FNAV_TOW_4 * 1000.0);
d_TOW_at_current_symbol_ms = d_TOW_at_Preamble_ms + static_cast<uint32_t>((GALILEO_FNAV_CODES_PER_PAGE + GALILEO_FNAV_CODES_PER_PREAMBLE) * GALILEO_E5a_CODE_PERIOD_MS);
d_nav.flag_TOW_4 = false;
}
else
{
d_TOW_at_current_symbol_ms += static_cast<uint32_t>(GALILEO_E5a_CODE_PERIOD_MS);
}
}
else // if there is not a new preamble, we define the TOW of the current symbol
{
if (d_nav.flag_TOW_set == true)
{
d_TOW_at_current_symbol_ms += static_cast<uint32_t>(GALILEO_E5a_CODE_PERIOD_MS);
}
}
// remove used symbols from history
// todo: Use circular buffer here
while (d_symbol_history.size() > required_symbols)
{
d_symbol_history.pop_front();
}
if (d_nav.flag_TOW_set)
{
current_sample.Flag_valid_word = true;
current_sample.TOW_at_current_symbol_ms = d_TOW_at_current_symbol_ms;
if (d_dump)
{
// MULTIPLEXED FILE RECORDING - Record results to file
try
{
double tmp_double;
uint64_t tmp_ulong_int;
tmp_double = static_cast<double>(d_TOW_at_current_symbol_ms) / 1000.0;
d_dump_file.write(reinterpret_cast<char *>(&tmp_double), sizeof(double));
tmp_ulong_int = current_sample.Tracking_sample_counter;
d_dump_file.write(reinterpret_cast<char *>(&tmp_ulong_int), sizeof(uint64_t));
tmp_double = static_cast<double>(d_TOW_at_Preamble_ms) / 1000.0;
d_dump_file.write(reinterpret_cast<char *>(&tmp_double), sizeof(double));
}
catch (const std::ifstream::failure &e)
{
LOG(WARNING) << "Exception writing Galileo E5a Telemetry Decoder dump file " << e.what();
}
}
// 3. Make the output
out[0] = current_sample;
return 1;
}
else
{
return 0;
}
}

127
src/algorithms/telemetry_decoder/gnuradio_blocks/galileo_e5a_telemetry_decoder_cc.h
View File

@ -1,127 +0,0 @@
/*!
* \file galileo_e5a_telemetry_decoder_cc.cc
* \brief Implementation of a Galileo FNAV message demodulator block
* \author Marc Sales, 2014. marcsales92(at)gmail.com
* Javier Arribas, 2017. jarribas(at)cttc.es
* \based on work from:
* <ul>
* <li> Javier Arribas, 2011. jarribas(at)cttc.es
* </ul>
*
*
* -------------------------------------------------------------------------
*
* Copyright (C) 2010-2018 (see AUTHORS file for a list of contributors)
*
* GNSS-SDR is a software defined Global Navigation
* Satellite Systems receiver
*
* This file is part of GNSS-SDR.
*
* GNSS-SDR is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GNSS-SDR is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNSS-SDR. If not, see <https://www.gnu.org/licenses/>.
*
* -------------------------------------------------------------------------
*/
#ifndef GNSS_SDR_GALILEO_E5A_TELEMETRY_DECODER_CC_H_
#define GNSS_SDR_GALILEO_E5A_TELEMETRY_DECODER_CC_H_
#include "Galileo_E5a.h"
#include "gnss_satellite.h"
#include "galileo_fnav_message.h"
#include "galileo_ephemeris.h"
#include "galileo_almanac.h"
#include "galileo_iono.h"
#include "galileo_utc_model.h"
#include "gnss_synchro.h"
#include <gnuradio/block.h>
#include <deque>
#include <fstream>
#include <string>
class galileo_e5a_telemetry_decoder_cc;
typedef boost::shared_ptr<galileo_e5a_telemetry_decoder_cc> galileo_e5a_telemetry_decoder_cc_sptr;
galileo_e5a_telemetry_decoder_cc_sptr galileo_e5a_make_telemetry_decoder_cc(const Gnss_Satellite &satellite, bool dump);
/*!
* \brief This class implements a block that decodes the FNAV data defined in Galileo ICD
*
*/
class galileo_e5a_telemetry_decoder_cc : public gr::block
{
public:
~galileo_e5a_telemetry_decoder_cc();
void set_satellite(const Gnss_Satellite &satellite); //!< Set satellite PRN
void set_channel(int32_t channel); //!< Set receiver's channel
/*!
* \brief This is where all signal processing takes place
*/
int general_work(int noutput_items, gr_vector_int &ninput_items,
gr_vector_const_void_star &input_items, gr_vector_void_star &output_items);
private:
friend galileo_e5a_telemetry_decoder_cc_sptr
galileo_e5a_make_telemetry_decoder_cc(const Gnss_Satellite &satellite, bool dump);
galileo_e5a_telemetry_decoder_cc(const Gnss_Satellite &satellite, bool dump);
void viterbi_decoder(double *page_part_symbols, int32_t *page_part_bits);
void deinterleaver(int32_t rows, int32_t cols, double *in, double *out);
void decode_word(double *page_symbols, int32_t frame_length);
int32_t d_preambles_bits[GALILEO_FNAV_PREAMBLE_LENGTH_BITS];
int32_t d_preamble_samples[GALILEO_FNAV_CODES_PER_PREAMBLE];
std::deque<int> d_preamble_init;
int32_t d_stat;
int32_t d_CRC_error_counter;
int32_t d_channel;
int32_t d_symbol_counter;
int32_t corr_value;
uint32_t required_symbols;
uint64_t d_sample_counter;
uint64_t d_preamble_index;
bool d_flag_frame_sync;
bool d_flag_preamble;
bool d_dump;
bool flag_TOW_set;
bool flag_bit_start;
bool new_symbol;
double d_prompt_acum;
double page_symbols[GALILEO_FNAV_SYMBOLS_PER_PAGE - GALILEO_FNAV_PREAMBLE_LENGTH_BITS];
uint32_t d_TOW_at_Preamble_ms;
uint32_t d_TOW_at_current_symbol_ms;
double delta_t; //GPS-GALILEO time offset
std::string d_dump_filename;
std::ofstream d_dump_file;
std::deque<Gnss_Synchro> d_symbol_history;
Gnss_Satellite d_satellite;
// navigation message vars
Galileo_Fnav_Message d_nav;
// vars for Viterbi decoder
int32_t *out0, *out1, *state0, *state1;
int32_t g_encoder[2];
const int32_t nn = 2; // Coding rate 1/n
const int32_t KK = 7; // Constraint Length
int32_t mm = KK - 1;
const int32_t CodeLength = 488;
int32_t DataLength = (CodeLength / nn) - mm;
};
#endif /* GNSS_SDR_GALILEO_E5A_TELEMETRY_DECODER_CC_H_ */

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/*!
* \file galileo_telemetry_decoder_cc.cc
* \brief Implementation of a Galileo unified INAV and FNAV message demodulator block
* \author Javier Arribas 2018. jarribas(at)cttc.es
*
* -------------------------------------------------------------------------
*
* Copyright (C) 2010-2018 (see AUTHORS file for a list of contributors)
*
* GNSS-SDR is a software defined Global Navigation
* Satellite Systems receiver
*
* This file is part of GNSS-SDR.
*
* GNSS-SDR is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GNSS-SDR is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNSS-SDR. If not, see <https://www.gnu.org/licenses/>.
*
* -------------------------------------------------------------------------
*/
#include "galileo_telemetry_decoder_cc.h"
#include "control_message_factory.h"
#include "convolutional.h"
#include "display.h"
#include "gnss_synchro.h"
#include <boost/lexical_cast.hpp>
#include <gnuradio/io_signature.h>
#include <glog/logging.h>
#include <volk_gnsssdr/volk_gnsssdr.h>
#include <iostream>
#define CRC_ERROR_LIMIT 6
using google::LogMessage;
galileo_telemetry_decoder_cc_sptr
galileo_make_telemetry_decoder_cc(const Gnss_Satellite &satellite, int frame_type, bool dump)
{
return galileo_telemetry_decoder_cc_sptr(new galileo_telemetry_decoder_cc(satellite, frame_type, dump));
}
void galileo_telemetry_decoder_cc::viterbi_decoder(double *page_part_symbols, int32_t *page_part_bits)
{
Viterbi(page_part_bits, out0, state0, out1, state1,
page_part_symbols, KK, nn, DataLength);
}
void galileo_telemetry_decoder_cc::deinterleaver(int32_t rows, int32_t cols, double *in, double *out)
{
for (int32_t r = 0; r < rows; r++)
{
for (int32_t c = 0; c < cols; c++)
{
out[c * rows + r] = in[r * cols + c];
}
}
}
galileo_telemetry_decoder_cc::galileo_telemetry_decoder_cc(
const Gnss_Satellite &satellite, int frame_type,
bool dump) : gr::block("galileo_telemetry_decoder_cc", gr::io_signature::make(1, 1, sizeof(Gnss_Synchro)),
gr::io_signature::make(1, 1, sizeof(Gnss_Synchro)))
{
// Ephemeris data port out
this->message_port_register_out(pmt::mp("telemetry"));
// initialize internal vars
d_dump = dump;
d_satellite = Gnss_Satellite(satellite.get_system(), satellite.get_PRN());
d_frame_type = frame_type;
LOG(INFO) << "Initializing GALILEO UNIFIED TELEMETRY DECODER";
switch (d_frame_type)
{
case 1: //INAV
{
d_PRN_code_period_ms = static_cast<uint32_t>(GALILEO_E1_CODE_PERIOD_MS);
d_samples_per_symbol = Galileo_E1_B_SAMPLES_PER_SYMBOL;
d_bits_per_preamble = GALILEO_INAV_PREAMBLE_LENGTH_BITS;
// set the preamble
d_samples_per_preamble = GALILEO_INAV_PREAMBLE_LENGTH_BITS * d_samples_per_symbol;
d_preamble_period_symbols = GALILEO_INAV_PREAMBLE_PERIOD_SYMBOLS;
d_required_symbols = static_cast<uint32_t>(GALILEO_INAV_PAGE_SYMBOLS) + d_samples_per_preamble;
// preamble bits to sampled symbols
d_preamble_samples = static_cast<int32_t *>(volk_gnsssdr_malloc(d_samples_per_preamble * sizeof(int32_t), volk_gnsssdr_get_alignment()));
d_frame_length_symbols = GALILEO_INAV_PAGE_PART_SYMBOLS - GALILEO_INAV_PREAMBLE_LENGTH_BITS;
CodeLength = GALILEO_INAV_PAGE_PART_SYMBOLS - GALILEO_INAV_PREAMBLE_LENGTH_BITS;
DataLength = (CodeLength / nn) - mm;
break;
}
case 2: //FNAV
{
d_PRN_code_period_ms = static_cast<uint32_t>(GALILEO_E5a_CODE_PERIOD_MS);
d_samples_per_symbol = GALILEO_FNAV_CODES_PER_SYMBOL;
d_bits_per_preamble = GALILEO_FNAV_PREAMBLE_LENGTH_BITS;
// set the preamble
d_samples_per_preamble = GALILEO_FNAV_PREAMBLE_LENGTH_BITS * d_samples_per_symbol;
d_preamble_period_symbols = GALILEO_FNAV_CODES_PER_PAGE;
d_required_symbols = static_cast<uint32_t>(GALILEO_FNAV_SYMBOLS_PER_PAGE) * d_samples_per_symbol + d_samples_per_preamble;
// preamble bits to sampled symbols
d_preamble_samples = static_cast<int32_t *>(volk_gnsssdr_malloc(d_samples_per_preamble * sizeof(int32_t), volk_gnsssdr_get_alignment()));
d_secondary_code_samples = static_cast<int32_t *>(volk_gnsssdr_malloc(Galileo_E5a_I_SECONDARY_CODE_LENGTH * sizeof(int32_t), volk_gnsssdr_get_alignment()));
d_frame_length_symbols = GALILEO_FNAV_SYMBOLS_PER_PAGE - GALILEO_FNAV_PREAMBLE_LENGTH_BITS;
CodeLength = GALILEO_FNAV_SYMBOLS_PER_PAGE - GALILEO_FNAV_PREAMBLE_LENGTH_BITS;
DataLength = (CodeLength / nn) - mm;
for (int32_t i = 0; i < Galileo_E5a_I_SECONDARY_CODE_LENGTH; i++)
{
if (Galileo_E5a_I_SECONDARY_CODE.at(i) == '1')
{
d_secondary_code_samples[i] = 1;
}
else
{
d_secondary_code_samples[i] = -1;
}
}
break;
}
default:
std::cout << "Galileo unified telemetry decoder error: Unknown frame type " << std::endl;
}
d_page_part_symbols = static_cast<double *>(volk_gnsssdr_malloc(d_frame_length_symbols * sizeof(double), volk_gnsssdr_get_alignment()));
int32_t n = 0;
for (int32_t i = 0; i < d_bits_per_preamble; i++)
{
switch (d_frame_type)
{
case 1: //INAV
{
if (GALILEO_INAV_PREAMBLE.at(i) == '1')
{
for (uint32_t j = 0; j < d_samples_per_symbol; j++)
{
d_preamble_samples[n] = 1;
n++;
}
}
else
{
for (uint32_t j = 0; j < d_samples_per_symbol; j++)
{
d_preamble_samples[n] = -1;
n++;
}
}
break;
}
case 2: //FNAV for E5a-I
{
// Galileo E5a data channel (E5a-I) still has a secondary code
int m = 0;
if (GALILEO_FNAV_PREAMBLE.at(i) == '1')
{
for (uint32_t j = 0; j < d_samples_per_symbol; j++)
{
d_preamble_samples[n] = d_secondary_code_samples[m];
n++;
m++;
m = m % Galileo_E5a_I_SECONDARY_CODE_LENGTH;
}
}
else
{
for (uint32_t j = 0; j < d_samples_per_symbol; j++)
{
d_preamble_samples[n] = -d_secondary_code_samples[m];
n++;
m++;
m = m % Galileo_E5a_I_SECONDARY_CODE_LENGTH;
}
}
break;
}
}
}
d_sample_counter = 0ULL;
d_stat = 0;
d_preamble_index = 0ULL;
d_flag_frame_sync = false;
d_flag_parity = false;
d_TOW_at_current_symbol_ms = 0;
d_TOW_at_Preamble_ms = 0;
delta_t = 0;
d_CRC_error_counter = 0;
flag_even_word_arrived = 0;
d_flag_preamble = false;
d_channel = 0;
flag_TOW_set = false;
// vars for Viterbi decoder
int32_t max_states = 1 << mm; // 2^mm
g_encoder[0] = 121; // Polynomial G1
g_encoder[1] = 91; // Polynomial G2
out0 = static_cast<int32_t *>(volk_gnsssdr_malloc(max_states * sizeof(int32_t), volk_gnsssdr_get_alignment()));
out1 = static_cast<int32_t *>(volk_gnsssdr_malloc(max_states * sizeof(int32_t), volk_gnsssdr_get_alignment()));
state0 = static_cast<int32_t *>(volk_gnsssdr_malloc(max_states * sizeof(int32_t), volk_gnsssdr_get_alignment()));
state1 = static_cast<int32_t *>(volk_gnsssdr_malloc(max_states * sizeof(int32_t), volk_gnsssdr_get_alignment()));
// create appropriate transition matrices
nsc_transit(out0, state0, 0, g_encoder, KK, nn);
nsc_transit(out1, state1, 1, g_encoder, KK, nn);
}
galileo_telemetry_decoder_cc::~galileo_telemetry_decoder_cc()
{
volk_gnsssdr_free(d_preamble_samples);
if (d_frame_type == 2)
{
volk_gnsssdr_free(d_secondary_code_samples);
}
volk_gnsssdr_free(d_page_part_symbols);
volk_gnsssdr_free(out0);
volk_gnsssdr_free(out1);
volk_gnsssdr_free(state0);
volk_gnsssdr_free(state1);
if (d_dump_file.is_open() == true)
{
try
{
d_dump_file.close();
}
catch (const std::exception &ex)
{
LOG(WARNING) << "Exception in destructor closing the dump file " << ex.what();
}
}
}
void galileo_telemetry_decoder_cc::decode_INAV_word(double *page_part_symbols, int32_t frame_length)
{
// 1. De-interleave
double *page_part_symbols_deint = static_cast<double *>(volk_gnsssdr_malloc(frame_length * sizeof(double), volk_gnsssdr_get_alignment()));
deinterleaver(GALILEO_INAV_INTERLEAVER_ROWS, GALILEO_INAV_INTERLEAVER_COLS, page_part_symbols, page_part_symbols_deint);
// 2. Viterbi decoder
// 2.1 Take into account the NOT gate in G2 polynomial (Galileo ICD Figure 13, FEC encoder)
// 2.2 Take into account the possible inversion of the polarity due to PLL lock at 180º
for (int32_t i = 0; i < frame_length; i++)
{
if ((i + 1) % 2 == 0)
{
page_part_symbols_deint[i] = -page_part_symbols_deint[i];
}
}
int32_t *page_part_bits = static_cast<int32_t *>(volk_gnsssdr_malloc((frame_length / 2) * sizeof(int32_t), volk_gnsssdr_get_alignment()));
viterbi_decoder(page_part_symbols_deint, page_part_bits);
volk_gnsssdr_free(page_part_symbols_deint);
// 3. Call the Galileo page decoder
std::string page_String;
for (int32_t i = 0; i < (frame_length / 2); i++)
{
if (page_part_bits[i] > 0)
{
page_String.push_back('1');
}
else
{
page_String.push_back('0');
}
}
if (page_part_bits[0] == 1)
{
// DECODE COMPLETE WORD (even + odd) and TEST CRC
d_inav_nav.split_page(page_String, flag_even_word_arrived);
if (d_inav_nav.flag_CRC_test == true)
{
LOG(INFO) << "Galileo E1 CRC correct in channel " << d_channel << " from satellite " << d_satellite;
}
else
{
LOG(INFO) << "Galileo E1 CRC error in channel " << d_channel << " from satellite " << d_satellite;
}
flag_even_word_arrived = 0;
}
else
{
// STORE HALF WORD (even page)
d_inav_nav.split_page(page_String.c_str(), flag_even_word_arrived);
flag_even_word_arrived = 1;
}
volk_gnsssdr_free(page_part_bits);
// 4. Push the new navigation data to the queues
if (d_inav_nav.have_new_ephemeris() == true)
{
// get object for this SV (mandatory)
std::shared_ptr<Galileo_Ephemeris> tmp_obj = std::make_shared<Galileo_Ephemeris>(d_inav_nav.get_ephemeris());
std::cout << "New Galileo E1 I/NAV message received in channel " << d_channel << ": ephemeris from satellite " << d_satellite << std::endl;
this->message_port_pub(pmt::mp("telemetry"), pmt::make_any(tmp_obj));
}
if (d_inav_nav.have_new_iono_and_GST() == true)
{
// get object for this SV (mandatory)
std::shared_ptr<Galileo_Iono> tmp_obj = std::make_shared<Galileo_Iono>(d_inav_nav.get_iono());
std::cout << "New Galileo E1 I/NAV message received in channel " << d_channel << ": iono/GST model parameters from satellite " << d_satellite << std::endl;
this->message_port_pub(pmt::mp("telemetry"), pmt::make_any(tmp_obj));
}
if (d_inav_nav.have_new_utc_model() == true)
{
// get object for this SV (mandatory)
std::shared_ptr<Galileo_Utc_Model> tmp_obj = std::make_shared<Galileo_Utc_Model>(d_inav_nav.get_utc_model());
std::cout << "New Galileo E1 I/NAV message received in channel " << d_channel << ": UTC model parameters from satellite " << d_satellite << std::endl;
this->message_port_pub(pmt::mp("telemetry"), pmt::make_any(tmp_obj));
}
if (d_inav_nav.have_new_almanac() == true)
{
std::shared_ptr<Galileo_Almanac> tmp_obj = std::make_shared<Galileo_Almanac>(d_inav_nav.get_almanac());
this->message_port_pub(pmt::mp("telemetry"), pmt::make_any(tmp_obj));
//debug
std::cout << "Galileo E1 I/NAV almanac received in channel " << d_channel << " from satellite " << d_satellite << std::endl;
DLOG(INFO) << "GPS_to_Galileo time conversion:";
DLOG(INFO) << "A0G=" << tmp_obj->A_0G_10;
DLOG(INFO) << "A1G=" << tmp_obj->A_1G_10;
DLOG(INFO) << "T0G=" << tmp_obj->t_0G_10;
DLOG(INFO) << "WN_0G_10=" << tmp_obj->WN_0G_10;
DLOG(INFO) << "Current parameters:";
DLOG(INFO) << "d_TOW_at_current_symbol_ms=" << d_TOW_at_current_symbol_ms;
DLOG(INFO) << "d_nav.WN_0=" << d_inav_nav.WN_0;
delta_t = tmp_obj->A_0G_10 + tmp_obj->A_1G_10 * (static_cast<double>(d_TOW_at_current_symbol_ms) / 1000.0 - tmp_obj->t_0G_10 + 604800 * (fmod((d_inav_nav.WN_0 - tmp_obj->WN_0G_10), 64)));
DLOG(INFO) << "delta_t=" << delta_t << "[s]";
}
}
void galileo_telemetry_decoder_cc::decode_FNAV_word(double *page_symbols, int32_t frame_length)
{
// 1. De-interleave
double *page_symbols_deint = static_cast<double *>(volk_gnsssdr_malloc(frame_length * sizeof(double), volk_gnsssdr_get_alignment()));
deinterleaver(GALILEO_FNAV_INTERLEAVER_ROWS, GALILEO_FNAV_INTERLEAVER_COLS, page_symbols, page_symbols_deint);
// 2. Viterbi decoder
// 2.1 Take into account the NOT gate in G2 polynomial (Galileo ICD Figure 13, FEC encoder)
// 2.2 Take into account the possible inversion of the polarity due to PLL lock at 180<38>
for (int32_t i = 0; i < frame_length; i++)
{
if ((i + 1) % 2 == 0)
{
page_symbols_deint[i] = -page_symbols_deint[i];
}
}
int32_t *page_bits = static_cast<int32_t *>(volk_gnsssdr_malloc((frame_length / 2) * sizeof(int32_t), volk_gnsssdr_get_alignment()));
viterbi_decoder(page_symbols_deint, page_bits);
volk_gnsssdr_free(page_symbols_deint);
// 3. Call the Galileo page decoder
std::string page_String;
for (int32_t i = 0; i < frame_length; i++)
{
if (page_bits[i] > 0)
{
page_String.push_back('1');
}
else
{
page_String.push_back('0');
}
}
volk_gnsssdr_free(page_bits);
// DECODE COMPLETE WORD (even + odd) and TEST CRC
d_fnav_nav.split_page(page_String);
if (d_fnav_nav.flag_CRC_test == true)
{
LOG(INFO) << "Galileo E5a CRC correct in channel " << d_channel << " from satellite " << d_satellite;
}
else
{
LOG(INFO) << "Galileo E5a CRC error in channel " << d_channel << " from satellite " << d_satellite;
}
// 4. Push the new navigation data to the queues
if (d_fnav_nav.have_new_ephemeris() == true)
{
std::shared_ptr<Galileo_Ephemeris> tmp_obj = std::make_shared<Galileo_Ephemeris>(d_fnav_nav.get_ephemeris());
std::cout << TEXT_MAGENTA << "New Galileo E5a F/NAV message received in channel " << d_channel << ": ephemeris from satellite " << d_satellite << TEXT_RESET << std::endl;
this->message_port_pub(pmt::mp("telemetry"), pmt::make_any(tmp_obj));
}
if (d_fnav_nav.have_new_iono_and_GST() == true)
{
std::shared_ptr<Galileo_Iono> tmp_obj = std::make_shared<Galileo_Iono>(d_fnav_nav.get_iono());
std::cout << TEXT_MAGENTA << "New Galileo E5a F/NAV message received in channel " << d_channel << ": iono/GST model parameters from satellite " << d_satellite << TEXT_RESET << std::endl;
this->message_port_pub(pmt::mp("telemetry"), pmt::make_any(tmp_obj));
}
if (d_fnav_nav.have_new_utc_model() == true)
{
std::shared_ptr<Galileo_Utc_Model> tmp_obj = std::make_shared<Galileo_Utc_Model>(d_fnav_nav.get_utc_model());
std::cout << TEXT_MAGENTA << "New Galileo E5a F/NAV message received in channel " << d_channel << ": UTC model parameters from satellite " << d_satellite << TEXT_RESET << std::endl;
this->message_port_pub(pmt::mp("telemetry"), pmt::make_any(tmp_obj));
}
}
void galileo_telemetry_decoder_cc::set_satellite(const Gnss_Satellite &satellite)
{
d_satellite = Gnss_Satellite(satellite.get_system(), satellite.get_PRN());
DLOG(INFO) << "Setting decoder Finite State Machine to satellite " << d_satellite;
DLOG(INFO) << "Navigation Satellite set to " << d_satellite;
}
void galileo_telemetry_decoder_cc::set_channel(int32_t channel)
{
d_channel = channel;
LOG(INFO) << "Navigation channel set to " << channel;
// ############# ENABLE DATA FILE LOG #################
if (d_dump == true)
{
if (d_dump_file.is_open() == false)
{
try
{
d_dump_filename = "telemetry";
d_dump_filename.append(boost::lexical_cast<std::string>(d_channel));
d_dump_filename.append(".dat");
d_dump_file.exceptions(std::ifstream::failbit | std::ifstream::badbit);
d_dump_file.open(d_dump_filename.c_str(), std::ios::out | std::ios::binary);
LOG(INFO) << "Telemetry decoder dump enabled on channel " << d_channel << " Log file: " << d_dump_filename.c_str();
}
catch (const std::ifstream::failure &e)
{
LOG(WARNING) << "channel " << d_channel << " Exception opening trk dump file " << e.what();
}
}
}
}
int galileo_telemetry_decoder_cc::general_work(int noutput_items __attribute__((unused)), gr_vector_int &ninput_items __attribute__((unused)),
gr_vector_const_void_star &input_items, gr_vector_void_star &output_items)
{
int32_t corr_value = 0;
int32_t preamble_diff = 0;
Gnss_Synchro **out = reinterpret_cast<Gnss_Synchro **>(&output_items[0]); // Get the output buffer pointer
const Gnss_Synchro **in = reinterpret_cast<const Gnss_Synchro **>(&input_items[0]); // Get the input buffer pointer
Gnss_Synchro current_symbol; // structure to save the synchronization information and send the output object to the next block
// 1. Copy the current tracking output
current_symbol = in[0][0];
// add new symbol to the symbol queue
d_symbol_history.push_back(current_symbol.Prompt_I);
d_sample_counter++; // count for the processed samples
consume_each(1);
d_flag_preamble = false;
if (d_symbol_history.size() > d_required_symbols)
{
// TODO Optimize me!
// ******* preamble correlation ********
for (int32_t i = 0; i < d_samples_per_preamble; i++)
{
if (d_symbol_history.at(i) < 0.0) // symbols clipping
{
corr_value -= d_preamble_samples[i];
}
else
{
corr_value += d_preamble_samples[i];
}
}
}
// ******* frame sync ******************
switch (d_stat)
{
case 0: // no preamble information
{
if (abs(corr_value) >= d_samples_per_preamble)
{
d_preamble_index = d_sample_counter; // record the preamble sample stamp
LOG(INFO) << "Preamble detection for Galileo satellite " << this->d_satellite;
d_stat = 1; // enter into frame pre-detection status
}
break;
}
case 1: // possible preamble lock
{
if (abs(corr_value) >= d_samples_per_preamble)
{
// check preamble separation
preamble_diff = static_cast<int32_t>(d_sample_counter - d_preamble_index);
if (abs(preamble_diff - d_preamble_period_symbols) == 0)
{
// try to decode frame
LOG(INFO) << "Starting page decoder for Galileo satellite " << this->d_satellite;
d_preamble_index = d_sample_counter; // record the preamble sample stamp
d_stat = 2;
}
else
{
if (preamble_diff > d_preamble_period_symbols)
{
d_stat = 0; // start again
}
}
}
break;
}
case 2: //preamble acquired
{
if (d_sample_counter == d_preamble_index + static_cast<uint64_t>(d_preamble_period_symbols))
{
// call the decoder
switch (d_frame_type)
{
case 1: //INAV
// NEW Galileo page part is received
// 0. fetch the symbols into an array
if (corr_value > 0) //normal PLL lock
{
for (uint32_t i = 0; i < d_frame_length_symbols; i++)
{
d_page_part_symbols[i] = d_symbol_history.at(i + d_samples_per_preamble); // because last symbol of the preamble is just received now!
}
}
else //180 deg. inverted carrier phase PLL lock
{
for (uint32_t i = 0; i < d_frame_length_symbols; i++)
{
d_page_part_symbols[i] = d_symbol_history.at(i + d_samples_per_preamble); // because last symbol of the preamble is just received now!
}
}
decode_INAV_word(d_page_part_symbols, d_frame_length_symbols);
break;
case 2: //FNAV
// NEW Galileo page part is received
// 0. fetch the symbols into an array
if (corr_value > 0) //normal PLL lock
{
int k = 0;
for (uint32_t i = 0; i < d_frame_length_symbols; i++)
{
d_page_part_symbols[i] = 0;
for (uint32_t m = 0; m < d_samples_per_symbol; m++)
{
d_page_part_symbols[i] += static_cast<float>(d_secondary_code_samples[k]) * d_symbol_history.at(i * d_samples_per_symbol + d_samples_per_preamble + m); // because last symbol of the preamble is just received now!
k++;
k = k % Galileo_E5a_I_SECONDARY_CODE_LENGTH;
}
}
}
else //180 deg. inverted carrier phase PLL lock
{
int k = 0;
for (uint32_t i = 0; i < d_frame_length_symbols; i++)
{
d_page_part_symbols[i] = 0;
for (uint32_t m = 0; m < d_samples_per_symbol; m++) //integrate samples into symbols
{
d_page_part_symbols[i] -= static_cast<float>(d_secondary_code_samples[k]) * d_symbol_history.at(i * d_samples_per_symbol + d_samples_per_preamble + m); // because last symbol of the preamble is just received now!
k++;
k = k % Galileo_E5a_I_SECONDARY_CODE_LENGTH;
}
}
}
decode_FNAV_word(d_page_part_symbols, d_frame_length_symbols);
break;
default:
return -1;
break;
}
if (d_inav_nav.flag_CRC_test == true or d_fnav_nav.flag_CRC_test == true)
{
d_CRC_error_counter = 0;
d_flag_preamble = true; // valid preamble indicator (initialized to false every work())
d_preamble_index = d_sample_counter; // record the preamble sample stamp (t_P)
if (!d_flag_frame_sync)
{
d_flag_frame_sync = true;
DLOG(INFO) << " Frame sync SAT " << this->d_satellite;
}
}
else
{
d_CRC_error_counter++;
d_preamble_index = d_sample_counter; // record the preamble sample stamp
if (d_CRC_error_counter > CRC_ERROR_LIMIT)
{
LOG(INFO) << "Lost of frame sync SAT " << this->d_satellite;
d_flag_frame_sync = false;
d_stat = 0;
d_TOW_at_current_symbol_ms = 0;
d_TOW_at_Preamble_ms = 0;
d_fnav_nav.flag_TOW_set = false;
d_inav_nav.flag_TOW_set = false;
}
}
}
break;
}
}
// UPDATE GNSS SYNCHRO DATA
// 2. Add the telemetry decoder information
if (this->d_flag_preamble == true)
// update TOW at the preamble instant
{
switch (d_frame_type)
{
case 1: //INAV
{
if (d_inav_nav.flag_TOW_set == true)
{
if (d_inav_nav.flag_TOW_5 == true) // page 5 arrived and decoded, so we are in the odd page (since Tow refers to the even page, we have to add 1 sec)
{
// TOW_5 refers to the even preamble, but when we decode it we are in the odd part, so 1 second later plus the decoding delay
d_TOW_at_Preamble_ms = static_cast<uint32_t>(d_inav_nav.TOW_5 * 1000.0);
d_TOW_at_current_symbol_ms = d_TOW_at_Preamble_ms + static_cast<uint32_t>(GALILEO_INAV_PAGE_PART_MS + (d_required_symbols + 1) * GALILEO_E1_CODE_PERIOD_MS);
d_inav_nav.flag_TOW_5 = false;
}
else if (d_inav_nav.flag_TOW_6 == true) // page 6 arrived and decoded, so we are in the odd page (since Tow refers to the even page, we have to add 1 sec)
{
// TOW_6 refers to the even preamble, but when we decode it we are in the odd part, so 1 second later plus the decoding delay
d_TOW_at_Preamble_ms = static_cast<uint32_t>(d_inav_nav.TOW_6 * 1000.0);
d_TOW_at_current_symbol_ms = d_TOW_at_Preamble_ms + static_cast<uint32_t>(GALILEO_INAV_PAGE_PART_MS + (d_required_symbols + 1) * GALILEO_E1_CODE_PERIOD_MS);
d_inav_nav.flag_TOW_6 = false;
}
else
{
// this page has no timing information
d_TOW_at_current_symbol_ms += static_cast<uint32_t>(GALILEO_E1_CODE_PERIOD_MS); // + GALILEO_INAV_PAGE_PART_SYMBOLS*GALILEO_E1_CODE_PERIOD;
}
}
break;
}
case 2: //FNAV
{
if (d_fnav_nav.flag_TOW_set == true)
{
if (d_fnav_nav.flag_TOW_1 == true)
{
d_TOW_at_Preamble_ms = static_cast<uint32_t>(d_fnav_nav.FNAV_TOW_1 * 1000.0);
d_TOW_at_current_symbol_ms = d_TOW_at_Preamble_ms + static_cast<uint32_t>((d_required_symbols + 1) * GALILEO_E5a_CODE_PERIOD_MS);
//d_TOW_at_current_symbol_ms = d_TOW_at_Preamble_ms + static_cast<uint32_t>((GALILEO_FNAV_CODES_PER_PAGE + GALILEO_FNAV_CODES_PER_PREAMBLE) * GALILEO_E5a_CODE_PERIOD_MS);
d_fnav_nav.flag_TOW_1 = false;
}
else if (d_fnav_nav.flag_TOW_2 == true)
{
d_TOW_at_Preamble_ms = static_cast<uint32_t>(d_fnav_nav.FNAV_TOW_2 * 1000.0);
//d_TOW_at_current_symbol_ms = d_TOW_at_Preamble_ms + static_cast<uint32_t>((GALILEO_FNAV_CODES_PER_PAGE + GALILEO_FNAV_CODES_PER_PREAMBLE) * GALILEO_E5a_CODE_PERIOD_MS);
d_TOW_at_current_symbol_ms = d_TOW_at_Preamble_ms + static_cast<uint32_t>((d_required_symbols + 1) * GALILEO_E5a_CODE_PERIOD_MS);
d_fnav_nav.flag_TOW_2 = false;
}
else if (d_fnav_nav.flag_TOW_3 == true)
{
d_TOW_at_Preamble_ms = static_cast<uint32_t>(d_fnav_nav.FNAV_TOW_3 * 1000.0);
//d_TOW_at_current_symbol_ms = d_TOW_at_Preamble_ms + static_cast<uint32_t>((GALILEO_FNAV_CODES_PER_PAGE + GALILEO_FNAV_CODES_PER_PREAMBLE) * GALILEO_E5a_CODE_PERIOD_MS);
d_TOW_at_current_symbol_ms = d_TOW_at_Preamble_ms + static_cast<uint32_t>((d_required_symbols + 1) * GALILEO_E5a_CODE_PERIOD_MS);
d_fnav_nav.flag_TOW_3 = false;
}
else if (d_fnav_nav.flag_TOW_4 == true)
{
d_TOW_at_Preamble_ms = static_cast<uint32_t>(d_fnav_nav.FNAV_TOW_4 * 1000.0);
//d_TOW_at_current_symbol_ms = d_TOW_at_Preamble_ms + static_cast<uint32_t>((GALILEO_FNAV_CODES_PER_PAGE + GALILEO_FNAV_CODES_PER_PREAMBLE) * GALILEO_E5a_CODE_PERIOD_MS);
d_TOW_at_current_symbol_ms = d_TOW_at_Preamble_ms + static_cast<uint32_t>((d_required_symbols + 1) * GALILEO_E5a_CODE_PERIOD_MS);
d_fnav_nav.flag_TOW_4 = false;
}
else
{
d_TOW_at_current_symbol_ms += static_cast<uint32_t>(GALILEO_E5a_CODE_PERIOD_MS);
}
break;
}
}
}
}
else // if there is not a new preamble, we define the TOW of the current symbol
{
switch (d_frame_type)
{
case 1: //INAV
{
if (d_inav_nav.flag_TOW_set == true)
{
d_TOW_at_current_symbol_ms += d_PRN_code_period_ms;
}
break;
}
case 2: //FNAV
{
if (d_fnav_nav.flag_TOW_set == true)
{
d_TOW_at_current_symbol_ms += d_PRN_code_period_ms;
}
break;
}
}
}
// remove used symbols from history
// todo: Use circular buffer here
if (d_symbol_history.size() > d_required_symbols)
{
d_symbol_history.pop_front();
}
switch (d_frame_type)
{
case 1: //INAV
{
if (d_inav_nav.flag_TOW_set)
{
if (d_inav_nav.flag_GGTO_1 == true and d_inav_nav.flag_GGTO_2 == true and d_inav_nav.flag_GGTO_3 == true and d_inav_nav.flag_GGTO_4 == true) // all GGTO parameters arrived
{
delta_t = d_inav_nav.A_0G_10 + d_inav_nav.A_1G_10 * (static_cast<double>(d_TOW_at_current_symbol_ms) / 1000.0 - d_inav_nav.t_0G_10 + 604800.0 * (fmod((d_inav_nav.WN_0 - d_inav_nav.WN_0G_10), 64.0)));
}
current_symbol.Flag_valid_word = true;
}
break;
}
case 2: //FNAV
{
if (d_fnav_nav.flag_TOW_set)
{
current_symbol.Flag_valid_word = true;
}
break;
}
}
if (d_inav_nav.flag_TOW_set or d_fnav_nav.flag_TOW_set)
{
current_symbol.TOW_at_current_symbol_ms = d_TOW_at_current_symbol_ms;
// todo: Galileo to GPS time conversion should be moved to observable block.
// current_symbol.TOW_at_current_symbol_ms -= delta_t; //Galileo to GPS TOW
if (d_dump == true)
{
// MULTIPLEXED FILE RECORDING - Record results to file
try
{
double tmp_double;
uint64_t tmp_ulong_int;
tmp_double = static_cast<double>(d_TOW_at_current_symbol_ms) / 1000.0;
d_dump_file.write(reinterpret_cast<char *>(&tmp_double), sizeof(double));
tmp_ulong_int = current_symbol.Tracking_sample_counter;
d_dump_file.write(reinterpret_cast<char *>(&tmp_ulong_int), sizeof(uint64_t));
tmp_double = static_cast<double>(d_TOW_at_Preamble_ms) / 1000.0;
d_dump_file.write(reinterpret_cast<char *>(&tmp_double), sizeof(double));
}
catch (const std::ifstream::failure &e)
{
LOG(WARNING) << "Exception writing observables dump file " << e.what();
}
}
// 3. Make the output (copy the object contents to the GNURadio reserved memory)
*out[0] = current_symbol;
return 1;
}
else
{
return 0;
}
}

58
src/algorithms/telemetry_decoder/gnuradio_blocks/galileo_e1b_telemetry_decoder_cc.h → src/algorithms/telemetry_decoder/gnuradio_blocks/galileo_telemetry_decoder_cc.h
View File

@ -1,8 +1,7 @@
/*!
* \file galileo_e1b_telemetry_decoder_cc.h
* \brief Interface of a Galileo INAV message demodulator block
* \author Javier Arribas 2013 jarribas(at)cttc.es,
* Mara Branzanti 2013 mara.branzanti(at)gmail.com
* \file galileo_telemetry_decoder_cc.h
* \brief Implementation of a Galileo unified INAV and FNAV message demodulator block
* \author Javier Arribas 2018. jarribas(at)cttc.es
*
* -------------------------------------------------------------------------
*
@ -29,12 +28,15 @@
* -------------------------------------------------------------------------
*/
#ifndef GNSS_SDR_GALILEO_E1B_TELEMETRY_DECODER_CC_H
#define GNSS_SDR_GALILEO_E1B_TELEMETRY_DECODER_CC_H
#ifndef GNSS_SDR_galileo_telemetry_decoder_cc_H
#define GNSS_SDR_galileo_telemetry_decoder_cc_H
#include "Galileo_E1.h"
#include "Galileo_E5a.h"
#include "galileo_navigation_message.h"
#include "galileo_fnav_message.h"
#include "galileo_ephemeris.h"
#include "galileo_almanac.h"
#include "galileo_iono.h"
@ -46,20 +48,20 @@
#include <string>
class galileo_e1b_telemetry_decoder_cc;
class galileo_telemetry_decoder_cc;
typedef boost::shared_ptr<galileo_e1b_telemetry_decoder_cc> galileo_e1b_telemetry_decoder_cc_sptr;
typedef boost::shared_ptr<galileo_telemetry_decoder_cc> galileo_telemetry_decoder_cc_sptr;
galileo_e1b_telemetry_decoder_cc_sptr galileo_e1b_make_telemetry_decoder_cc(const Gnss_Satellite &satellite, bool dump);
galileo_telemetry_decoder_cc_sptr galileo_make_telemetry_decoder_cc(const Gnss_Satellite &satellite, int frame_type, bool dump);
/*!
* \brief This class implements a block that decodes the INAV data defined in Galileo ICD
* \brief This class implements a block that decodes the INAV and FNAV data defined in Galileo ICD
*
*/
class galileo_e1b_telemetry_decoder_cc : public gr::block
class galileo_telemetry_decoder_cc : public gr::block
{
public:
~galileo_e1b_telemetry_decoder_cc();
~galileo_telemetry_decoder_cc();
void set_satellite(const Gnss_Satellite &satellite); //!< Set satellite PRN
void set_channel(int32_t channel); //!< Set receiver's channel
int32_t flag_even_word_arrived;
@ -71,23 +73,30 @@ public:
gr_vector_const_void_star &input_items, gr_vector_void_star &output_items);
private:
friend galileo_e1b_telemetry_decoder_cc_sptr
galileo_e1b_make_telemetry_decoder_cc(const Gnss_Satellite &satellite, bool dump);
galileo_e1b_telemetry_decoder_cc(const Gnss_Satellite &satellite, bool dump);
friend galileo_telemetry_decoder_cc_sptr
galileo_make_telemetry_decoder_cc(const Gnss_Satellite &satellite, int frame_type, bool dump);
galileo_telemetry_decoder_cc(const Gnss_Satellite &satellite, int frame_type, bool dump);
void viterbi_decoder(double *page_part_symbols, int32_t *page_part_bits);
void deinterleaver(int32_t rows, int32_t cols, double *in, double *out);
void decode_word(double *symbols, int32_t frame_length);
void decode_INAV_word(double *symbols, int32_t frame_length);
void decode_FNAV_word(double *page_symbols, int32_t frame_length);
uint16_t d_preambles_bits[GALILEO_INAV_PREAMBLE_LENGTH_BITS];
int32_t *d_preambles_symbols;
int d_frame_type;
int32_t d_bits_per_preamble;
int32_t d_samples_per_preamble;
int32_t d_preamble_period_symbols;
int32_t *d_preamble_samples;
int32_t *d_secondary_code_samples;
uint32_t d_samples_per_symbol;
int32_t d_symbols_per_preamble;
uint32_t d_PRN_code_period_ms;
uint32_t d_required_symbols;
uint32_t d_frame_length_symbols;
double *d_page_part_symbols;
std::deque<Gnss_Synchro> d_symbol_history;
std::deque<float> d_symbol_history;
uint64_t d_sample_counter;
uint64_t d_preamble_index;
@ -99,7 +108,8 @@ private:
int32_t d_CRC_error_counter;
// navigation message vars
Galileo_Navigation_Message d_nav;
Galileo_Navigation_Message d_inav_nav;
Galileo_Fnav_Message d_fnav_nav;
bool d_dump;
Gnss_Satellite d_satellite;
@ -120,8 +130,8 @@ private:
const int32_t nn = 2; // Coding rate 1/n
const int32_t KK = 7; // Constraint Length
int32_t mm = KK - 1;
const int32_t CodeLength = 240;
int32_t DataLength = (CodeLength / nn) - mm;
int32_t CodeLength;
int32_t DataLength;
};
#endif

9
src/algorithms/tracking/gnuradio_blocks/dll_pll_veml_tracking.cc
View File

@ -238,17 +238,18 @@ dll_pll_veml_tracking::dll_pll_veml_tracking(const Dll_Pll_Conf &conf_) : gr::bl
d_correlation_length_ms = 1;
d_code_samples_per_chip = 1;
d_code_length_chips = static_cast<uint32_t>(Galileo_E5a_CODE_LENGTH_CHIPS);
d_secondary = true;
if (trk_parameters.track_pilot)
{
d_secondary = true;
d_secondary_code_length = static_cast<uint32_t>(Galileo_E5a_Q_SECONDARY_CODE_LENGTH);
signal_pretty_name = signal_pretty_name + "Q";
interchange_iq = true;
}
else
{
d_secondary_code_length = static_cast<uint32_t>(Galileo_E5a_I_SECONDARY_CODE_LENGTH);
d_secondary_code_string = const_cast<std::string *>(&Galileo_E5a_I_SECONDARY_CODE);
//Do not acquire secondary code in data component. It is done in telemetry decoder
d_secondary = false;
signal_pretty_name = signal_pretty_name + "I";
interchange_iq = false;
}
@ -497,7 +498,7 @@ void dll_pll_veml_tracking::start_tracking()
for (uint32_t i = 0; i < d_code_length_chips; i++)
{
d_tracking_code[i] = aux_code[i].imag();
d_data_code[i] = aux_code[i].real();
d_data_code[i] = aux_code[i].real(); //the same because it is generated the full signal (E5aI + E5aQ)
}
d_Prompt_Data[0] = gr_complex(0.0, 0.0);
correlator_data_cpu.set_local_code_and_taps(d_code_length_chips, d_data_code, d_prompt_data_shift);

6
src/core/system_parameters/Galileo_E1.h
View File

@ -59,6 +59,7 @@ const double Galileo_E1_SUB_CARRIER_A_RATE_HZ = 1.023e6; //!< Galileo E1 sub-ca
const double Galileo_E1_SUB_CARRIER_B_RATE_HZ = 6.138e6; //!< Galileo E1 sub-carrier 'b' rate [Hz]
const double Galileo_E1_B_CODE_LENGTH_CHIPS = 4092.0; //!< Galileo E1-B code length [chips]
const double Galileo_E1_B_SYMBOL_RATE_BPS = 250.0; //!< Galileo E1-B symbol rate [bits/second]
const int32_t Galileo_E1_B_SAMPLES_PER_SYMBOL = 1; //!< (Galileo_E1_CODE_CHIP_RATE_HZ / Galileo_E1_B_CODE_LENGTH_CHIPS) / Galileo_E1_B_SYMBOL_RATE_BPS
const int32_t Galileo_E1_C_SECONDARY_CODE_LENGTH = 25; //!< Galileo E1-C secondary code length [chips]
const int32_t Galileo_E1_NUMBER_OF_CODES = 50;
@ -70,10 +71,7 @@ const int32_t GALILEO_E1_HISTORY_DEEP = 100;
// Galileo INAV Telemetry structure
#define GALILEO_INAV_PREAMBLE \
{ \
0, 1, 0, 1, 1, 0, 0, 0, 0, 0 \
}
const std::string GALILEO_INAV_PREAMBLE = {"0101100000"};
const int32_t GALILEO_INAV_PREAMBLE_LENGTH_BITS = 10;
const double GALILEO_INAV_PAGE_PART_WITH_PREABLE_SECONDS = 2.0 + GALILEO_INAV_PREAMBLE_LENGTH_BITS * Galileo_E1_CODE_PERIOD;