mirrors/gnss-sdr
1
0
Fork 0
mirror of https://github.com/gnss-sdr/gnss-sdr synced 2024-12-14 04:00:34 +00:00
Code Issues Releases Wiki Activity

Move HAS decoding to the galileo_e6_has_msg_receiver block

Browse Source
This commit is contained in:
Carles Fernandez 2021-06-04 17:13:35 +02:00
parent ca442c7076
commit 1feca37b4e
No known key found for this signature in database
GPG Key ID: 4C583C52B0C3877D
2 changed files with 638 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

626
src/core/libs/galileo_e6_has_msg_receiver.cc
View File

@ -1,8 +1,10 @@
/*!
* \file galileo_e6_has_msg_receiver.cc
* \brief GNU Radio block that receives asynchronous Galileo E6 HAS message
* sections from Galileo E6 telemetry blocks
* \brief GNU Radio block that processes Galileo HAS message pages received from
* Galileo E6B telemetry blocks. After successful decoding, sends the content to
* the PVT block.
* \author Javier Arribas, 2021. jarribas(at)cttc.es
* \author Carles Fernandez-Prades, 2021. cfernandez(at)cttc.es
*
* -----------------------------------------------------------------------------
*
@ -17,16 +19,16 @@
#include "galileo_e6_has_msg_receiver.h"
#include "galileo_has_data.h" // for Galileo_HAS_data
#include "galileo_has_page.h" // for Galileo_HAS_page
#include "gnss_sdr_make_unique.h"
#include "reed_solomon.h"
#include <boost/any.hpp>
#include <glog/logging.h>
#include <gnuradio/gr_complex.h>
#include <gnuradio/io_signature.h>
#include <cstddef>
#include <cstdint>
#include <typeinfo>
#include <utility>
#include <algorithm> // std::find
#include <cstddef> // size_t
#include <numeric> // std::accumulate
#include <typeinfo> // typeid
#if HAS_GENERIC_LAMBDA
#else
@ -42,7 +44,7 @@ galileo_e6_has_msg_receiver_sptr galileo_e6_has_msg_receiver_make()
galileo_e6_has_msg_receiver::galileo_e6_has_msg_receiver() : gr::block("galileo_e6_has_msg_receiver", gr::io_signature::make(0, 0, 0), gr::io_signature::make(0, 0, 0))
{
// register Gal E6 HAS input message port
// register Gal E6 HAS input message port from telemetry blocks
this->message_port_register_in(pmt::mp("E6_HAS_from_TLM"));
this->set_msg_handler(pmt::mp("E6_HAS_from_TLM"),
#if HAS_GENERIC_LAMBDA
@ -55,41 +57,615 @@ galileo_e6_has_msg_receiver::galileo_e6_has_msg_receiver() : gr::block("galileo_
#endif
#endif
// register Gal E6 processed HAS out
// register Gal E6 processed HAS async output message port towards PVT
this->message_port_register_out(pmt::mp("E6_HAS_to_PVT"));
// initialize Reed-Solomon decoder
d_rs = std::make_unique<ReedSolomon>();
}
void galileo_e6_has_msg_receiver::msg_handler_galileo_e6_has(const pmt::pmt_t& msg)
{
gr::thread::scoped_lock lock(d_setlock); // require mutex with msg_handler_galileo_e6_has function called by the scheduler
// 1. receive the PMT message and reconstruct the object...
try
{
const size_t msg_type_hash_code = pmt::any_ref(msg).type().hash_code();
if (msg_type_hash_code == typeid(std::shared_ptr<Galileo_HAS_page>).hash_code())
{
const auto HAS_data_obj_obj = boost::any_cast<std::shared_ptr<Galileo_HAS_page>>(pmt::any_ref(msg));
// std::cout << HAS_data_obj_obj->has_message_string << '\n';
// store / do things with the data
const auto HAS_data_page = boost::any_cast<std::shared_ptr<Galileo_HAS_page>>(pmt::any_ref(msg));
DLOG(INFO) << "New HAS page received: "
<< "Status: " << static_cast<float>(HAS_data_page->has_status) << ", "
<< "MT: " << static_cast<float>(HAS_data_page->message_type) << ", "
<< "MID: " << static_cast<float>(HAS_data_page->message_id) << ", "
<< "MS: " << static_cast<float>(HAS_data_page->message_size) << ", "
<< "PID: " << static_cast<float>(HAS_data_page->message_page_id);
process_HAS_page(*HAS_data_page.get());
}
else
{
LOG(WARNING) << "channel_status_msg_receiver unknown object type!";
LOG(WARNING) << "galileo_e6_has_msg_receiver received an unknown object type!";
}
}
catch (const boost::bad_any_cast& e)
{
LOG(WARNING) << "channel_status_msg_receiver Bad any_cast: " << e.what();
LOG(WARNING) << "galileo_e6_has_msg_receiver Bad any_cast: " << e.what();
}
// 2. Trigger the HAS processing function if required
// TODO
// 3. Send the resulting decoded HAS data (if available) to PVT
// TODO: fill message object and send to PVT when ready
std::shared_ptr<Galileo_HAS_data> dummy{};
this->message_port_pub(pmt::mp("E6_HAS_to_PVT"), pmt::make_any(dummy));
// Send the resulting decoded HAS data (if available) to PVT
if (d_new_message == true)
{
auto has_data_ptr = std::make_shared<Galileo_HAS_data>(d_HAS_data);
this->message_port_pub(pmt::mp("E6_HAS_to_PVT"), pmt::make_any(has_data_ptr));
d_new_message = false;
DLOG(INFO) << "HAS message sent to the PVT block through the E6_HAS_to_PVT async message port";
}
}
void galileo_e6_has_msg_receiver::process_HAS_page(const Galileo_HAS_page& has_page)
{
if (has_page.has_status == 0 || has_page.has_status == 1)
{
std::string page_string(has_page.has_message_string);
if (has_page.message_page_id != 0) // PID=0 is reserved, ignore it
{
if (has_page.message_type == 1) // contains satellite corrections
{
if (has_page.message_id < 32) // MID range is from 0 to 31
{
if (std::find(d_received_pages[has_page.message_id].begin(), d_received_pages[has_page.message_id].end(), has_page.message_page_id) == d_received_pages[has_page.message_id].end())
{
// New pid! Annotate it.
d_received_pages[has_page.message_id].push_back(has_page.message_page_id);
for (int k = 0; k < GALILEO_CNAV_OCTETS_IN_SUBPAGE; k++)
{
std::string bits8 = page_string.substr(k * 8, 8);
std::bitset<8> bs(bits8);
d_C_matrix[has_page.message_id][has_page.message_page_id - 1][k] = static_cast<uint8_t>(bs.to_ulong());
}
}
}
}
}
}
// If we have received for this message ID a number of pages equal to the message size
if (d_received_pages[has_page.message_id].size() == has_page.message_size)
{
// Try to decode the message
int res = decode_message_type1(has_page.message_id, has_page.message_size);
if (res == 0)
{
// Successful decoding, we have a valid HAS message stored at d_HAS_data
d_new_message = true;
}
else
{
d_new_message = false;
}
}
}
int galileo_e6_has_msg_receiver::decode_message_type1(uint8_t message_id, uint8_t message_size)
{
DLOG(INFO) << "Start decoding of a HAS message";
// Compute erasure positions
std::vector<int> erasure_positions;
erasure_positions.reserve(223); // Maximum erasure positions ( = number of parity symbols in a block)
for (int i = 0; i < message_size; i++) // we know that from message_size to 32, the value is 0
{
if (d_C_matrix[message_id][i][0] == 0)
{
erasure_positions.push_back(i);
}
}
for (int i = 32; i < 255; i++)
{
if (d_C_matrix[message_id][i][0] == 0)
{
erasure_positions.push_back(i);
}
}
// Reset HAS message matrix
d_M_matrix = {GALILEO_CNAV_INFORMATION_VECTOR_LENGTH, std::vector<uint8_t>(GALILEO_CNAV_OCTETS_IN_SUBPAGE)};
// Vertical decoding of d_C_matrix
for (int col = 0; col < GALILEO_CNAV_OCTETS_IN_SUBPAGE; col++)
{
std::vector<uint8_t> C_column(GALILEO_CNAV_MAX_NUMBER_SYMBOLS_ENCODED_BLOCK, 0);
for (auto pid : d_received_pages[message_id])
{
C_column[pid - 1] = d_C_matrix[message_id][pid - 1][col];
}
int result = d_rs->decode(C_column, erasure_positions);
if (result < 0)
{
DLOG(INFO) << "Decoding of HAS page failed";
return -1;
}
DLOG(INFO) << "Successful HAS page decoding";
std::vector<uint8_t> M_column(C_column.begin(), C_column.begin() + GALILEO_CNAV_INFORMATION_VECTOR_LENGTH);
for (int i = 0; i < GALILEO_CNAV_INFORMATION_VECTOR_LENGTH; i++)
{
d_M_matrix[i][col] = M_column[i];
}
}
// Form the decoded HAS message by reading rows of d_M_matrix
std::string decoded_message_type_1;
decoded_message_type_1.reserve(message_size * GALILEO_CNAV_OCTETS_IN_SUBPAGE * 8);
for (uint8_t row = 0; row < message_size; row++)
{
for (int col = 0; col < GALILEO_CNAV_OCTETS_IN_SUBPAGE; col++)
{
std::bitset<8> bs(d_M_matrix[row][col]);
decoded_message_type_1 += bs.to_string();
}
}
// reset data for next decoding
d_C_matrix[message_id] = {GALILEO_CNAV_MAX_NUMBER_SYMBOLS_ENCODED_BLOCK, std::vector<uint8_t>(GALILEO_CNAV_OCTETS_IN_SUBPAGE, 0)};
d_received_pages[message_id].clear();
// Trigger HAS message content reading and fill the d_HAS_data object
d_HAS_data = Galileo_HAS_data();
read_MT1_header(decoded_message_type_1);
read_MT1_body(decoded_message_type_1);
return 0;
}
void galileo_e6_has_msg_receiver::read_MT1_header(const std::string& message_string)
{
// ICD v1.2 Table 6: MT1 Message Header
const std::bitset<GALILEO_CNAV_MT1_HEADER_BITS> has_mt1_header(message_string);
d_HAS_data.header.toh = read_has_message_header_parameter_uint16(has_mt1_header, GALILEO_MT1_HEADER_TOH);
d_HAS_data.header.mask_id = read_has_message_header_parameter_uint8(has_mt1_header, GALILEO_MT1_HEADER_MASK_ID);
d_HAS_data.header.iod_id = read_has_message_header_parameter_uint8(has_mt1_header, GALILEO_MT1_HEADER_IOD_ID);
d_HAS_data.header.mask_flag = read_has_message_header_parameter_bool(has_mt1_header, GALILEO_MT1_HEADER_MASK_FLAG);
d_HAS_data.header.orbit_correction_flag = read_has_message_header_parameter_bool(has_mt1_header, GALILEO_MT1_HEADER_ORBIT_CORRECTION_FLAG);
d_HAS_data.header.clock_fullset_flag = read_has_message_header_parameter_bool(has_mt1_header, GALILEO_MT1_HEADER_CLOCK_FULLSET_FLAG);
d_HAS_data.header.clock_subset_flag = read_has_message_header_parameter_bool(has_mt1_header, GALILEO_MT1_HEADER_CLOCK_SUBSET_FLAG);
d_HAS_data.header.code_bias_flag = read_has_message_header_parameter_bool(has_mt1_header, GALILEO_MT1_HEADER_CODE_BIAS_FLAG);
d_HAS_data.header.phase_bias_flag = read_has_message_header_parameter_bool(has_mt1_header, GALILEO_MT1_HEADER_PHASE_BIAS_FLAG);
d_HAS_data.header.ura_flag = read_has_message_header_parameter_bool(has_mt1_header, GALILEO_MT1_HEADER_URA_FLAG);
DLOG(INFO) << "MT1 header: "
<< "TOH: " << static_cast<float>(d_HAS_data.header.toh) << ", "
<< "mask iD: " << static_cast<float>(d_HAS_data.header.mask_id) << ", "
<< "iod iD: " << static_cast<float>(d_HAS_data.header.iod_id) << ", "
<< "mask_flag: " << static_cast<float>(d_HAS_data.header.mask_flag) << ", "
<< "orbit_correction_flag: " << static_cast<float>(d_HAS_data.header.orbit_correction_flag) << ", "
<< "clock_fullset_flag: " << static_cast<float>(d_HAS_data.header.clock_fullset_flag) << ", "
<< "clock_subset_flag: " << static_cast<float>(d_HAS_data.header.clock_subset_flag) << ", "
<< "code_bias_flag: " << static_cast<float>(d_HAS_data.header.code_bias_flag) << ", "
<< "phase_bias_flag: " << static_cast<float>(d_HAS_data.header.phase_bias_flag) << ", "
<< "ura_flag: " << static_cast<float>(d_HAS_data.header.ura_flag);
}
void galileo_e6_has_msg_receiver::read_MT1_body(const std::string& message_string)
{
// ICD v1.2 Table 7: MT1 Message Body.
auto message = std::string(message_string.begin() + GALILEO_CNAV_MT1_HEADER_BITS, message_string.end()); // Remove header
int Nsat = 0;
if (d_HAS_data.header.mask_flag)
{
// read mask
d_HAS_data.Nsys = read_has_message_body_uint8(message.substr(0, HAS_MSG_NSYS_LENGTH));
message = std::string(message.begin() + HAS_MSG_NSYS_LENGTH, message.end());
d_HAS_data.gnss_id_mask.reserve(d_HAS_data.Nsys);
d_HAS_data.cell_mask.reserve(d_HAS_data.Nsys);
d_HAS_data.cell_mask_availability_flag.reserve(d_HAS_data.Nsys);
d_HAS_data.nav_message.reserve(d_HAS_data.Nsys);
for (uint8_t i = 0; i < d_HAS_data.Nsys; i++)
{
d_HAS_data.gnss_id_mask[i] = read_has_message_body_uint8(message.substr(0, HAS_MSG_ID_MASK_LENGTH));
message = std::string(message.begin() + HAS_MSG_ID_MASK_LENGTH, message.end());
std::string msg = message.substr(0, HAS_MSG_SATELLITE_MASK_LENGTH);
d_HAS_data.satellite_mask[i] = read_has_message_body_uint64(msg);
int ones_in_satellite_mask = 0;
for (char c : msg)
{
if (c == '1')
{
ones_in_satellite_mask++;
}
}
Nsat += ones_in_satellite_mask;
message = std::string(message.begin() + HAS_MSG_SATELLITE_MASK_LENGTH, message.end());
msg = message.substr(0, HAS_MSG_SIGNAL_MASK_LENGTH);
d_HAS_data.signal_mask[i] = read_has_message_body_uint16(msg);
int ones_in_signal_mask = 0;
for (char c : msg)
{
if (c == '1')
{
ones_in_signal_mask++;
}
}
message = std::string(message.begin() + HAS_MSG_SIGNAL_MASK_LENGTH, message.end());
if (message.substr(0, 1) == "1")
{
d_HAS_data.cell_mask_availability_flag[i] = true;
}
else
{
d_HAS_data.cell_mask_availability_flag[i] = false;
}
message = std::string(message.begin() + 1, message.end());
int size_cell = ones_in_satellite_mask * ones_in_signal_mask;
d_HAS_data.cell_mask[i].reserve(ones_in_satellite_mask);
for (int s = 0; s < ones_in_satellite_mask; s++)
{
d_HAS_data.cell_mask[i][s].reserve(ones_in_signal_mask);
for (int sig = 0; sig < ones_in_signal_mask; sig++)
{
d_HAS_data.cell_mask[i][s][sig] = (message[sig] == '1' ? true : false);
}
}
message = std::string(message.begin() + size_cell, message.end());
d_HAS_data.nav_message[i] = read_has_message_body_uint8(message.substr(0, HAS_MSG_NAV_MESSAGE_LENGTH));
message = std::string(message.begin() + HAS_MSG_NAV_MESSAGE_LENGTH, message.end());
}
}
if (d_HAS_data.header.orbit_correction_flag)
{
// read orbit corrections
d_HAS_data.validity_interval_index_orbit_corrections = read_has_message_body_uint8(message.substr(0, HAS_MSG_VALIDITY_INDEX_LENGTH));
message = std::string(message.begin() + HAS_MSG_VALIDITY_INDEX_LENGTH, message.end());
d_HAS_data.gnss_iod.reserve(Nsat);
d_HAS_data.delta_radial.reserve(Nsat);
d_HAS_data.delta_along_track.reserve(Nsat);
d_HAS_data.delta_cross_track.reserve(Nsat);
for (int i = 0; i < Nsat; i++)
{
if (d_HAS_data.gnss_id_mask[i] == HAS_MSG_GPS_SYSTEM)
{
d_HAS_data.gnss_iod[i] = read_has_message_body_uint16(message.substr(0, HAS_MSG_IOD_GPS_LENGTH));
message = std::string(message.begin() + HAS_MSG_IOD_GPS_LENGTH, message.end());
}
if (d_HAS_data.gnss_id_mask[i] == HAS_MSG_GALILEO_SYSTEM)
{
d_HAS_data.gnss_iod[i] = read_has_message_body_uint16(message.substr(0, HAS_MSG_IOD_GAL_LENGTH));
message = std::string(message.begin() + HAS_MSG_IOD_GAL_LENGTH, message.end());
}
d_HAS_data.delta_radial[i] = read_has_message_body_int16(message.substr(0, HAS_MSG_DELTA_RADIAL_LENGTH));
message = std::string(message.begin() + HAS_MSG_DELTA_RADIAL_LENGTH, message.end());
d_HAS_data.delta_along_track[i] = read_has_message_body_int16(message.substr(0, HAS_MSG_DELTA_ALONG_TRACK_LENGTH));
message = std::string(message.begin() + HAS_MSG_DELTA_ALONG_TRACK_LENGTH, message.end());
d_HAS_data.delta_cross_track[i] = read_has_message_body_int16(message.substr(0, HAS_MSG_DELTA_CROSS_TRACK_LENGTH));
message = std::string(message.begin() + HAS_MSG_DELTA_CROSS_TRACK_LENGTH, message.end());
}
}
if (d_HAS_data.header.clock_fullset_flag)
{
// read clock full-set corrections
d_HAS_data.validity_interval_index_clock_fullset_corrections = read_has_message_body_uint8(message.substr(0, HAS_MSG_VALIDITY_INDEX_LENGTH));
message = std::string(message.begin() + HAS_MSG_VALIDITY_INDEX_LENGTH, message.end());
d_HAS_data.delta_clock_c0_multiplier.reserve(d_HAS_data.Nsys);
for (uint8_t i = 0; i < d_HAS_data.Nsys; i++)
{
if (d_HAS_data.gnss_id_mask[i] != HAS_MSG_GALILEO_SYSTEM)
{
d_HAS_data.delta_clock_c0_multiplier[i] = read_has_message_body_uint8(message.substr(0, HAS_MSG_DELTA_CLOCK_C0_MULTIPLIER_LENGTH));
message = std::string(message.begin() + HAS_MSG_DELTA_CLOCK_C0_MULTIPLIER_LENGTH, message.end());
}
}
d_HAS_data.iod_change_flag.reserve(Nsat);
d_HAS_data.delta_clock_c0.reserve(Nsat);
for (int i = 0; i < Nsat; i++)
{
d_HAS_data.iod_change_flag[i] = (message[0] == '1' ? true : false);
message = std::string(message.begin() + 1, message.end());
d_HAS_data.delta_clock_c0[i] = read_has_message_body_int16(message.substr(0, HAS_MSG_DELTA_CLOCK_C0_LENGTH));
message = std::string(message.begin() + HAS_MSG_DELTA_CLOCK_C0_LENGTH, message.end());
}
}
if (d_HAS_data.header.clock_subset_flag)
{
// read clock subset corrections
d_HAS_data.validity_interval_index_clock_subset_corrections = read_has_message_body_uint8(message.substr(0, HAS_MSG_VALIDITY_INDEX_LENGTH));
message = std::string(message.begin() + HAS_MSG_VALIDITY_INDEX_LENGTH, message.end());
d_HAS_data.Nsysprime = read_has_message_body_uint8(message.substr(0, HAS_MSG_NSYSPRIME_LENGTH));
message = std::string(message.begin() + HAS_MSG_NSYSPRIME_LENGTH, message.end());
d_HAS_data.gnss_id_clock_subset.reserve(d_HAS_data.Nsysprime);
d_HAS_data.delta_clock_c0_multiplier_clock_subset.reserve(d_HAS_data.Nsysprime);
d_HAS_data.satellite_submask.reserve(d_HAS_data.Nsysprime);
d_HAS_data.iod_change_flag_clock_subset.reserve(d_HAS_data.Nsysprime);
d_HAS_data.delta_clock_c0_clock_subset.reserve(d_HAS_data.Nsysprime);
for (uint8_t i = 0; i < d_HAS_data.Nsysprime; i++)
{
d_HAS_data.gnss_id_clock_subset[i] = read_has_message_body_uint8(message.substr(0, HAS_MSG_ID_CLOCK_SUBSET_LENGTH));
message = std::string(message.begin() + HAS_MSG_ID_CLOCK_SUBSET_LENGTH, message.end());
if (d_HAS_data.gnss_id_clock_subset[i] != HAS_MSG_GALILEO_SYSTEM)
{
d_HAS_data.delta_clock_c0_multiplier_clock_subset[i] = read_has_message_body_uint8(message.substr(0, HAS_MSG_DELTA_CLOCK_MULTIPLIER_SUBSET_LENGTH));
message = std::string(message.begin() + HAS_MSG_DELTA_CLOCK_MULTIPLIER_SUBSET_LENGTH, message.end());
}
uint64_t number_sats_this_gnss_id = 0;
for (uint8_t j = 0; j < d_HAS_data.Nsys; j++)
{
if (d_HAS_data.gnss_id_mask[j] == d_HAS_data.gnss_id_clock_subset[i])
{
uint64_t n = d_HAS_data.satellite_mask[j];
while (n)
{
number_sats_this_gnss_id += n & 1;
n >>= 1;
}
break;
}
}
d_HAS_data.satellite_submask[i].reserve(number_sats_this_gnss_id);
for (uint64_t j = 0; j < number_sats_this_gnss_id; j++)
{
d_HAS_data.satellite_submask[i][j] = read_has_message_body_uint64(message.substr(0, 1));
message = std::string(message.begin() + 1, message.end());
}
d_HAS_data.iod_change_flag_clock_subset[i] = (message[0] == '1' ? true : false);
message = std::string(message.begin() + 1, message.end());
d_HAS_data.delta_clock_c0_clock_subset[i] = read_has_message_body_int16(message.substr(0, HAS_MSG_DELTA_CLOCK_C0_SUBSET_LENGTH));
message = std::string(message.begin() + HAS_MSG_DELTA_CLOCK_C0_SUBSET_LENGTH, message.end());
}
}
if (d_HAS_data.header.code_bias_flag)
{
// read code bias
d_HAS_data.validity_interval_index_code_bias_corrections = read_has_message_body_uint8(message.substr(0, HAS_MSG_VALIDITY_INDEX_LENGTH));
message = std::string(message.begin() + HAS_MSG_VALIDITY_INDEX_LENGTH, message.end());
std::vector<uint64_t> number_sats(d_HAS_data.Nsys, 0);
std::vector<uint64_t> number_codes(d_HAS_data.Nsys, 0);
for (int sys = 0; sys < d_HAS_data.Nsys; sys++)
{
uint64_t number_sats_this_gnss_id = 0;
uint64_t number_signals_this_gnss_id = 0;
if (d_HAS_data.cell_mask_availability_flag[sys] == true)
{
uint64_t n = d_HAS_data.satellite_mask[sys];
while (n)
{
number_sats_this_gnss_id += n & 1;
n >>= 1;
}
uint64_t m = d_HAS_data.signal_mask[sys];
while (m)
{
number_signals_this_gnss_id += m & 1;
m >>= 1;
}
}
else
{
number_sats_this_gnss_id = HAS_MSG_MAX_SATS;
number_signals_this_gnss_id = HAS_MSG_MAX_SIGNALS;
}
number_sats[sys] = number_sats_this_gnss_id;
number_codes[sys] = number_signals_this_gnss_id;
}
uint64_t Nsat_b = std::accumulate(number_sats.begin(), number_sats.end(), 0ULL);
d_HAS_data.code_bias.reserve(Nsat_b);
int sat = 0;
for (int sys = 0; sys < d_HAS_data.Nsys; sys++)
{
d_HAS_data.code_bias[sat].reserve(number_codes[sys]);
for (uint64_t c = 0; c < number_codes[sys]; c++)
{
d_HAS_data.code_bias[sat][c] = read_has_message_body_int16(message.substr(0, HAS_MSG_CODE_BIAS_LENGTH));
message = std::string(message.begin() + HAS_MSG_CODE_BIAS_LENGTH, message.end());
sat += 1;
}
}
}
if (d_HAS_data.header.phase_bias_flag)
{
// read phase bias
d_HAS_data.validity_interval_index_phase_bias_corrections = read_has_message_body_uint8(message.substr(0, HAS_MSG_VALIDITY_INDEX_LENGTH));
message = std::string(message.begin() + HAS_MSG_VALIDITY_INDEX_LENGTH, message.end());
std::vector<uint64_t> number_sats(d_HAS_data.Nsys, 0);
std::vector<uint64_t> number_phases(d_HAS_data.Nsys, 0);
for (int sys = 0; sys < d_HAS_data.Nsys; sys++)
{
uint64_t number_sats_this_gnss_id = 0;
uint64_t number_signals_this_gnss_id = 0;
if (d_HAS_data.cell_mask_availability_flag[sys] == true)
{
uint64_t n = d_HAS_data.satellite_mask[sys];
while (n)
{
number_sats_this_gnss_id += n & 1;
n >>= 1;
}
uint64_t m = d_HAS_data.signal_mask[sys];
while (m)
{
number_signals_this_gnss_id += m & 1;
m >>= 1;
}
}
else
{
number_sats_this_gnss_id = HAS_MSG_MAX_SATS;
number_signals_this_gnss_id = HAS_MSG_MAX_SIGNALS;
}
number_sats[sys] = number_sats_this_gnss_id;
number_phases[sys] = number_signals_this_gnss_id;
}
uint64_t Nsat_p = std::accumulate(number_sats.begin(), number_sats.end(), 0ULL);
d_HAS_data.phase_bias.reserve(Nsat_p);
d_HAS_data.phase_discontinuity_indicator.reserve(Nsat_p);
int sat = 0;
for (int sys = 0; sys < d_HAS_data.Nsys; sys++)
{
d_HAS_data.phase_bias[sat].reserve(number_phases[sys]);
d_HAS_data.phase_discontinuity_indicator[sat].reserve(number_phases[sys]);
for (uint64_t p = 0; p < number_phases[sys]; p++)
{
d_HAS_data.phase_bias[sat][p] = read_has_message_body_int16(message.substr(0, HAS_MSG_PHASE_BIAS_LENGTH));
message = std::string(message.begin() + HAS_MSG_PHASE_BIAS_LENGTH, message.end());
d_HAS_data.phase_discontinuity_indicator[sat][p] = read_has_message_body_uint8(message.substr(0, HAS_MSG_PHASE_DISCONTINUITY_INDICATOR_LENGTH));
message = std::string(message.begin() + HAS_MSG_PHASE_DISCONTINUITY_INDICATOR_LENGTH, message.end());
sat += 1;
}
}
}
if (d_HAS_data.header.ura_flag)
{
// read URA
d_HAS_data.validity_interval_index_ura_corrections = read_has_message_body_uint8(message.substr(0, HAS_MSG_VALIDITY_INDEX_LENGTH));
message = std::string(message.begin() + HAS_MSG_VALIDITY_INDEX_LENGTH, message.end());
d_HAS_data.ura.reserve(Nsat);
for (int i = 0; i < Nsat; i++)
{
d_HAS_data.ura[i] = read_has_message_body_uint8(message.substr(0, HAS_MSG_URA_LENGTH));
message = std::string(message.begin() + HAS_MSG_URA_LENGTH, message.end());
}
}
}
uint8_t galileo_e6_has_msg_receiver::read_has_message_header_parameter_uint8(const std::bitset<GALILEO_CNAV_MT1_HEADER_BITS>& bits, const std::pair<int32_t, int32_t>& parameter) const
{
uint8_t value = 0U;
for (int j = 0; j < parameter.second; j++)
{
value <<= 1U; // shift left
if (static_cast<int>(bits[GALILEO_CNAV_MT1_HEADER_BITS - parameter.first - j]) == 1)
{
value += 1; // insert the bit
}
}
return value;
}
uint16_t galileo_e6_has_msg_receiver::read_has_message_header_parameter_uint16(const std::bitset<GALILEO_CNAV_MT1_HEADER_BITS>& bits, const std::pair<int32_t, int32_t>& parameter) const
{
uint16_t value = 0U;
for (int j = 0; j < parameter.second; j++)
{
value <<= 1U; // shift left
if (static_cast<int>(bits[GALILEO_CNAV_MT1_HEADER_BITS - parameter.first - j]) == 1)
{
value += 1; // insert the bit
}
}
return value;
}
bool galileo_e6_has_msg_receiver::read_has_message_header_parameter_bool(const std::bitset<GALILEO_CNAV_MT1_HEADER_BITS>& bits, const std::pair<int32_t, int32_t>& parameter) const
{
bool value = false;
if (static_cast<int>(bits[GALILEO_CNAV_MT1_HEADER_BITS - parameter.first]) == 1)
{
value = true;
}
return value;
}
uint8_t galileo_e6_has_msg_receiver::read_has_message_body_uint8(const std::string& bits) const
{
uint8_t value = 0U;
size_t len = bits.length();
for (size_t j = 0; j < len; j++)
{
value <<= 1U; // shift left
if (static_cast<int>(bits[len - 1 - j]) == 1)
{
value += 1; // insert the bit
}
}
return value;
}
uint16_t galileo_e6_has_msg_receiver::read_has_message_body_uint16(const std::string& bits) const
{
uint16_t value = 0U;
size_t len = bits.length();
for (size_t j = 0; j < len; j++)
{
value <<= 1U; // shift left
if (static_cast<int>(bits[len - 1 - j]) == 1)
{
value += 1; // insert the bit
}
}
return value;
}
uint64_t galileo_e6_has_msg_receiver::read_has_message_body_uint64(const std::string& bits) const
{
uint64_t value = 0U;
size_t len = bits.length();
for (size_t j = 0; j < len; j++)
{
value <<= 1U; // shift left
if (static_cast<int>(bits[len - 1 - j]) == 1)
{
value += 1; // insert the bit
}
}
return value;
}
int16_t galileo_e6_has_msg_receiver::read_has_message_body_int16(const std::string& bits) const
{
int16_t value = 0;
size_t len = bits.length();
// read the MSB and perform the sign extension
if (static_cast<int>(bits[len - 1]) == 1)
{
value ^= 0xFFFF; // 16 bits variable
}
else
{
value &= 0;
}
for (size_t j = 0; j < len; j++)
{
value *= 2; // shift left the signed integer
value &= 0xFFFE; // reset the corresponding bit (for the 16 bits variable)
if (static_cast<int>(bits[len - 1 - j]) == 1)
{
value += 1; // insert the bit
}
}
return value;
}

44
src/core/libs/galileo_e6_has_msg_receiver.h
View File

@ -1,8 +1,10 @@
/*!
* \file galileo_e6_has_msg_receiver.h
* \brief GNU Radio block that receives asynchronous Galileo E6 HAS message
* sections from Galileo E6 telemetry blocks
* \brief GNU Radio block that processes Galileo HAS message pages received from
* Galileo E6B telemetry blocks. After successful decoding, sends the content to
* the PVT block.
* \author Javier Arribas, 2021. jarribas(at)cttc.es
* \author Carles Fernandez-Prades, 2021. cfernandez(at)cttc.es
*
* -----------------------------------------------------------------------------
*
@ -18,19 +20,25 @@
#ifndef GNSS_SDR_GALILEO_E6_HAS_MSG_RECEIVER_H
#define GNSS_SDR_GALILEO_E6_HAS_MSG_RECEIVER_H
#include "Galileo_CNAV.h"
#include "galileo_has_data.h"
#include "gnss_block_interface.h"
#include "reed_solomon.h"
#include <gnuradio/block.h>
#include <pmt/pmt.h>
#include <map>
#include <bitset>
#include <cstdint>
#include <memory>
#include <string>
#include <utility> // std::pair
#include <vector>
/** \addtogroup Core
* \{ */
/** \addtogroup Core_Receiver_Library
* \{ */
class Galileo_HAS_page;
class ReedSolomon;
class galileo_e6_has_msg_receiver;
using galileo_e6_has_msg_receiver_sptr = gnss_shared_ptr<galileo_e6_has_msg_receiver>;
@ -38,7 +46,10 @@ using galileo_e6_has_msg_receiver_sptr = gnss_shared_ptr<galileo_e6_has_msg_rece
galileo_e6_has_msg_receiver_sptr galileo_e6_has_msg_receiver_make();
/*!
* \brief GNU Radio block that receives asynchronous galileo e6 has messages from tlm blocks
* \brief GNU Radio block that receives asynchronous Galileo HAS message pages
* from the telemetry blocks, stores them in memory, and decodes HAS messages
* when enough data have been received.
* The decoded HAS message is sent to the PVT block.
*/
class galileo_e6_has_msg_receiver : public gr::block
{
@ -49,7 +60,26 @@ private:
friend galileo_e6_has_msg_receiver_sptr galileo_e6_has_msg_receiver_make();
galileo_e6_has_msg_receiver();
void msg_handler_galileo_e6_has(const pmt::pmt_t& msg);
ReedSolomon rs = ReedSolomon();
void process_HAS_page(const Galileo_HAS_page& has_page);
void read_MT1_header(const std::string& message_string);
void read_MT1_body(const std::string& message_string);
int decode_message_type1(uint8_t message_id, uint8_t message_size);
uint8_t read_has_message_header_parameter_uint8(const std::bitset<GALILEO_CNAV_MT1_HEADER_BITS>& bits, const std::pair<int32_t, int32_t>& parameter) const;
uint16_t read_has_message_header_parameter_uint16(const std::bitset<GALILEO_CNAV_MT1_HEADER_BITS>& bits, const std::pair<int32_t, int32_t>& parameter) const;
bool read_has_message_header_parameter_bool(const std::bitset<GALILEO_CNAV_MT1_HEADER_BITS>& bits, const std::pair<int32_t, int32_t>& parameter) const;
uint8_t read_has_message_body_uint8(const std::string& bits) const;
uint16_t read_has_message_body_uint16(const std::string& bits) const;
uint64_t read_has_message_body_uint64(const std::string& bits) const;
int16_t read_has_message_body_int16(const std::string& bits) const;
std::unique_ptr<ReedSolomon> d_rs;
Galileo_HAS_data d_HAS_data{};
std::vector<std::vector<std::vector<uint8_t>>> d_C_matrix{32, std::vector<std::vector<uint8_t>>(GALILEO_CNAV_MAX_NUMBER_SYMBOLS_ENCODED_BLOCK, std::vector<uint8_t>(GALILEO_CNAV_OCTETS_IN_SUBPAGE, 0))}; // 32 x 255 x 53
std::vector<std::vector<uint8_t>> d_M_matrix{GALILEO_CNAV_INFORMATION_VECTOR_LENGTH, std::vector<uint8_t>(GALILEO_CNAV_OCTETS_IN_SUBPAGE, 0)}; // HAS message matrix 32 x 53
std::vector<std::vector<uint8_t>> d_received_pages{32, std::vector<uint8_t>()};
bool d_new_message{};
};