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gnss-sdr/src/tests/unit-tests/signal-processing-blocks/tracking/gps_l1_ca_dll_pll_tracking_...

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/*!
* \file gps_l1_ca_dll_pll_tracking_test.cc
* \brief This class implements a tracking test for Galileo_E5a_DLL_PLL_Tracking
* implementation based on some input parameters.
* \author Marc Majoral, 2017. mmajoral(at)cttc.cat
* \author Javier Arribas, 2017. jarribas(at)cttc.es
*
*
* -------------------------------------------------------------------------
*
* Copyright (C) 2012-2019 (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.
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
* -------------------------------------------------------------------------
*/
#include "GPS_L1_CA.h"
#include "gnss_block_factory.h"
#include "gnss_block_interface.h"
#include "gnss_synchro.h"
#include "gps_l1_ca_dll_pll_tracking_fpga.h"
#include "in_memory_configuration.h"
#include "interleaved_byte_to_complex_short.h"
#include "signal_generator_flags.h"
#include "tracking_dump_reader.h"
#include "tracking_interface.h"
#include "tracking_true_obs_reader.h"
#include <armadillo>
#include <boost/thread.hpp> // to test the FPGA we have to create a simultaneous task to send the samples using the DMA and stop the test
#include <gflags/gflags.h>
#include <glog/logging.h>
#include <gnuradio/analog/sig_source_waveform.h>
#include <gnuradio/blocks/file_source.h>
#include <gnuradio/blocks/interleaved_char_to_complex.h>
#include <gnuradio/blocks/null_sink.h>
#include <gnuradio/blocks/skiphead.h>
#include <gnuradio/top_block.h>
#include <gtest/gtest.h>
#include <chrono>
#include <cstdio> // FPGA read input file
#include <fcntl.h>
#include <iostream>
#include <unistd.h>
#include <utility>
#if HAS_GENERIC_LAMBDA
#else
#include <boost/bind/bind.hpp>
#endif
#ifdef GR_GREATER_38
#include <gnuradio/analog/sig_source.h>
#else
#include <gnuradio/analog/sig_source_c.h>
#endif
#if GNURADIO_USES_STD_POINTERS
#include <memory>
#else
#include <boost/shared_ptr.hpp>
#endif
#define DMA_TRACK_TRANSFER_SIZE 2046 // DMA transfer size for tracking
#define MIN_SAMPLES_REMAINING 20000 // number of remaining samples in the DMA that causes the CPU to stop the flowgraph (it has to be a bit alrger than 2x max packet size)
#define FIVE_SECONDS 5000000 // five seconds in microseconds
void send_tracking_gps_input_samples(FILE *rx_signal_file,
int num_remaining_samples, const gr::top_block_sptr &top_block)
{
int num_samples_transferred = 0; // number of samples that have been transferred to the DMA so far
static int flowgraph_stopped = 0; // flag to indicate if the flowgraph is stopped already
char *buffer_DMA; // temporary buffer to store the samples to be sent to the DMA
int dma_descr; // DMA descriptor
dma_descr = open("/dev/loop_tx", O_WRONLY);
if (dma_descr < 0)
{
std::cerr << "Can't open loop device\n";
return;
}
buffer_DMA = reinterpret_cast<char *>(malloc(DMA_TRACK_TRANSFER_SIZE));
if (!buffer_DMA)
{
std::cerr << "Memory error!" << std::endl;
close(dma_descr);
return;
}
while (num_remaining_samples > 0)
{
if (num_remaining_samples < MIN_SAMPLES_REMAINING)
{
if (flowgraph_stopped == 0)
{
// stop top module
top_block->stop();
flowgraph_stopped = 1;
}
}
if (num_remaining_samples > DMA_TRACK_TRANSFER_SIZE)
{
size_t result = fread(buffer_DMA, DMA_TRACK_TRANSFER_SIZE, 1, rx_signal_file);
if (result != DMA_TRACK_TRANSFER_SIZE)
{
std::cerr << "Error reading from DMA" << std::endl;
}
assert(DMA_TRACK_TRANSFER_SIZE == write(dma_descr, &buffer_DMA[0], DMA_TRACK_TRANSFER_SIZE));
num_remaining_samples = num_remaining_samples - DMA_TRACK_TRANSFER_SIZE;
num_samples_transferred = num_samples_transferred + DMA_TRACK_TRANSFER_SIZE;
}
else
{
size_t result = fread(buffer_DMA, num_remaining_samples, 1, rx_signal_file);
if (static_cast<int>(result) != num_remaining_samples)
{
std::cerr << "Error reading from DMA" << std::endl;
}
assert(num_remaining_samples == write(dma_descr, &buffer_DMA[0], num_remaining_samples));
num_samples_transferred = num_samples_transferred + num_remaining_samples;
num_remaining_samples = 0;
}
}
free(buffer_DMA);
close(dma_descr);
}
// thread that sends the samples to the FPGA
void sending_thread(const gr::top_block_sptr &top_block, const char *file_name)
{
// file descriptor
FILE *rx_signal_file; // file descriptor
int file_length; // length of the file containing the received samples
rx_signal_file = fopen(file_name, "rb");
if (!rx_signal_file)
{
std::cerr << "Unable to open file!" << std::endl;
return;
}
fseek(rx_signal_file, 0, SEEK_END);
file_length = ftell(rx_signal_file);
fseek(rx_signal_file, 0, SEEK_SET);
usleep(FIVE_SECONDS); // wait for some time to give time to the other thread to program the device
// send_tracking_gps_input_samples(dma_descr, rx_signal_file, file_length);
send_tracking_gps_input_samples(rx_signal_file, file_length, top_block);
fclose(rx_signal_file);
}
// ######## GNURADIO BLOCK MESSAGE RECEVER #########
class GpsL1CADllPllTrackingTestFpga_msg_rx;
#if GNURADIO_USES_STD_POINTERS
using GpsL1CADllPllTrackingTestFpga_msg_rx_sptr = std::shared_ptr<GpsL1CADllPllTrackingTestFpga_msg_rx>;
#else
using GpsL1CADllPllTrackingTestFpga_msg_rx_sptr = boost::shared_ptr<GpsL1CADllPllTrackingTestFpga_msg_rx>;
#endif
GpsL1CADllPllTrackingTestFpga_msg_rx_sptr GpsL1CADllPllTrackingTestFpga_msg_rx_make();
class GpsL1CADllPllTrackingTestFpga_msg_rx : public gr::block
{
private:
friend GpsL1CADllPllTrackingTestFpga_msg_rx_sptr GpsL1CADllPllTrackingTestFpga_msg_rx_make();
void msg_handler_events(const pmt::pmt_t &msg);
GpsL1CADllPllTrackingTestFpga_msg_rx();
public:
int rx_message;
~GpsL1CADllPllTrackingTestFpga_msg_rx() override; //!< Default destructor
};
GpsL1CADllPllTrackingTestFpga_msg_rx_sptr GpsL1CADllPllTrackingTestFpga_msg_rx_make()
{
return GpsL1CADllPllTrackingTestFpga_msg_rx_sptr(
new GpsL1CADllPllTrackingTestFpga_msg_rx());
}
void GpsL1CADllPllTrackingTestFpga_msg_rx::msg_handler_events(const pmt::pmt_t &msg)
{
try
{
int64_t message = pmt::to_long(msg);
rx_message = message;
}
catch (boost::bad_any_cast &e)
{
LOG(WARNING) << "msg_handler_telemetry Bad any cast!";
rx_message = 0;
}
}
GpsL1CADllPllTrackingTestFpga_msg_rx::GpsL1CADllPllTrackingTestFpga_msg_rx() : gr::block("GpsL1CADllPllTrackingTestFpga_msg_rx",
gr::io_signature::make(0, 0, 0),
gr::io_signature::make(0, 0, 0))
{
this->message_port_register_in(pmt::mp("events"));
this->set_msg_handler(pmt::mp("events"),
#if HAS_GENERIC_LAMBDA
[this](auto &&PH1) { msg_handler_events(PH1); });
#else
#if USE_BOOST_BIND_PLACEHOLDERS
boost::bind(&GpsL1CADllPllTrackingTestFpga_msg_rx::msg_handler_events, this, boost::placeholders::_1));
#else
boost::bind(&GpsL1CADllPllTrackingTestFpga_msg_rx::msg_handler_events, this, _1));
#endif
#endif
rx_message = 0;
}
GpsL1CADllPllTrackingTestFpga_msg_rx::~GpsL1CADllPllTrackingTestFpga_msg_rx() = default;
// ###########################################################
class GpsL1CADllPllTrackingTestFpga : public ::testing::Test
{
public:
std::string generator_binary;
std::string p1;
std::string p2;
std::string p3;
std::string p4;
std::string p5;
const int baseband_sampling_freq = FLAGS_fs_gen_sps;
std::string filename_rinex_obs = FLAGS_filename_rinex_obs;
std::string filename_raw_data = FLAGS_filename_raw_data;
int configure_generator();
int generate_signal();
void check_results_doppler(arma::vec &true_time_s, arma::vec &true_value,
arma::vec &meas_time_s, arma::vec &meas_value);
void check_results_acc_carrier_phase(arma::vec &true_time_s,
arma::vec &true_value, arma::vec &meas_time_s, arma::vec &meas_value);
void check_results_codephase(arma::vec &true_time_s, arma::vec &true_value,
arma::vec &meas_time_s, arma::vec &meas_value);
GpsL1CADllPllTrackingTestFpga()
{
factory = std::make_shared<GNSSBlockFactory>();
config = std::make_shared<InMemoryConfiguration>();
item_size = sizeof(gr_complex);
gnss_synchro = Gnss_Synchro();
}
~GpsL1CADllPllTrackingTestFpga() override = default;
void configure_receiver();
gr::top_block_sptr top_block;
std::shared_ptr<GNSSBlockFactory> factory;
std::shared_ptr<InMemoryConfiguration> config;
Gnss_Synchro gnss_synchro;
size_t item_size;
};
int GpsL1CADllPllTrackingTestFpga::configure_generator()
{
// Configure signal generator
generator_binary = FLAGS_generator_binary;
p1 = std::string("-rinex_nav_file=") + FLAGS_rinex_nav_file;
if (FLAGS_dynamic_position.empty())
{
p2 = std::string("-static_position=") + FLAGS_static_position + std::string(",") + std::to_string(FLAGS_duration * 10);
}
else
{
p2 = std::string("-obs_pos_file=") + std::string(FLAGS_dynamic_position);
}
p3 = std::string("-rinex_obs_file=") + FLAGS_filename_rinex_obs; // RINEX 2.10 observation file output
p4 = std::string("-sig_out_file=") + FLAGS_filename_raw_data; // Baseband signal output file. Will be stored in int8_t IQ multiplexed samples
p5 = std::string("-sampling_freq=") + std::to_string(baseband_sampling_freq); // Baseband sampling frequency [MSps]
return 0;
}
int GpsL1CADllPllTrackingTestFpga::generate_signal()
{
int child_status;
char *const parmList[] = {&generator_binary[0], &generator_binary[0], &p1[0], &p2[0], &p3[0],
&p4[0], &p5[0], nullptr};
int pid;
if ((pid = fork()) == -1)
{
perror("fork err");
}
else if (pid == 0)
{
execv(&generator_binary[0], parmList);
std::cout << "Return not expected. Must be an execv err." << std::endl;
std::terminate();
}
waitpid(pid, &child_status, 0);
std::cout << "Signal and Observables RINEX and RAW files created." << std::endl;
return 0;
}
void GpsL1CADllPllTrackingTestFpga::configure_receiver()
{
gnss_synchro.Channel_ID = 0;
gnss_synchro.System = 'G';
std::string signal = "1C";
signal.copy(gnss_synchro.Signal, 2, 0);
gnss_synchro.PRN = FLAGS_test_satellite_PRN;
config->set_property("GNSS-SDR.internal_fs_sps",
std::to_string(baseband_sampling_freq));
// Set Tracking
config->set_property("Tracking_1C.implementation",
"GPS_L1_CA_DLL_PLL_Tracking_Fpga");
config->set_property("Tracking_1C.item_type", "cshort");
config->set_property("Tracking_1C.dump", "true");
config->set_property("Tracking_1C.dump_filename", "./tracking_ch_");
config->set_property("Tracking_1C.pll_bw_hz", "30.0");
config->set_property("Tracking_1C.dll_bw_hz", "2.0");
config->set_property("Tracking_1C.early_late_space_chips", "0.5");
config->set_property("Tracking_1C.devicename", "/dev/uio");
config->set_property("Tracking_1C.device_base", "1");
}
void GpsL1CADllPllTrackingTestFpga::check_results_doppler(arma::vec &true_time_s,
arma::vec &true_value, arma::vec &meas_time_s, arma::vec &meas_value)
{
// 1. True value interpolation to match the measurement times
arma::vec true_value_interp;
arma::uvec true_time_s_valid = find(true_time_s > 0);
true_time_s = true_time_s(true_time_s_valid);
true_value = true_value(true_time_s_valid);
arma::uvec meas_time_s_valid = find(meas_time_s > 0);
meas_time_s = meas_time_s(meas_time_s_valid);
meas_value = meas_value(meas_time_s_valid);
arma::interp1(true_time_s, true_value, meas_time_s, true_value_interp);
// 2. RMSE
arma::vec err;
err = meas_value - true_value_interp;
arma::vec err2 = arma::square(err);
double rmse = sqrt(arma::mean(err2));
// 3. Mean err and variance
double error_mean = arma::mean(err);
double error_var = arma::var(err);
// 4. Peaks
double max_error = arma::max(err);
double min_error = arma::min(err);
// 5. report
std::streamsize ss = std::cout.precision();
std::cout << std::setprecision(10) << "TRK Doppler RMSE=" << rmse
<< ", mean=" << error_mean << ", stdev=" << sqrt(error_var)
<< " (max,min)=" << max_error << "," << min_error << " [Hz]"
<< std::endl;
std::cout.precision(ss);
}
void GpsL1CADllPllTrackingTestFpga::check_results_acc_carrier_phase(
arma::vec &true_time_s, arma::vec &true_value, arma::vec &meas_time_s,
arma::vec &meas_value)
{
// 1. True value interpolation to match the measurement times
arma::vec true_value_interp;
arma::uvec true_time_s_valid = find(true_time_s > 0);
true_time_s = true_time_s(true_time_s_valid);
true_value = true_value(true_time_s_valid);
arma::uvec meas_time_s_valid = find(meas_time_s > 0);
meas_time_s = meas_time_s(meas_time_s_valid);
meas_value = meas_value(meas_time_s_valid);
arma::interp1(true_time_s, true_value, meas_time_s, true_value_interp);
// 2. RMSE
arma::vec err;
err = meas_value - true_value_interp;
arma::vec err2 = arma::square(err);
double rmse = sqrt(arma::mean(err2));
// 3. Mean err and variance
double error_mean = arma::mean(err);
double error_var = arma::var(err);
// 4. Peaks
double max_error = arma::max(err);
double min_error = arma::min(err);
// 5. report
std::streamsize ss = std::cout.precision();
std::cout << std::setprecision(10) << "TRK acc carrier phase RMSE=" << rmse
<< ", mean=" << error_mean << ", stdev=" << sqrt(error_var)
<< " (max,min)=" << max_error << "," << min_error << " [Hz]"
<< std::endl;
std::cout.precision(ss);
}
void GpsL1CADllPllTrackingTestFpga::check_results_codephase(
arma::vec &true_time_s, arma::vec &true_value, arma::vec &meas_time_s,
arma::vec &meas_value)
{
// 1. True value interpolation to match the measurement times
arma::vec true_value_interp;
arma::uvec true_time_s_valid = find(true_time_s > 0);
true_time_s = true_time_s(true_time_s_valid);
true_value = true_value(true_time_s_valid);
arma::uvec meas_time_s_valid = find(meas_time_s > 0);
meas_time_s = meas_time_s(meas_time_s_valid);
meas_value = meas_value(meas_time_s_valid);
arma::interp1(true_time_s, true_value, meas_time_s, true_value_interp);
// 2. RMSE
arma::vec err;
err = meas_value - true_value_interp;
arma::vec err2 = arma::square(err);
double rmse = sqrt(arma::mean(err2));
// 3. Mean err and variance
double error_mean = arma::mean(err);
double error_var = arma::var(err);
// 4. Peaks
double max_error = arma::max(err);
double min_error = arma::min(err);
// 5. report
std::streamsize ss = std::cout.precision();
std::cout << std::setprecision(10) << "TRK code phase RMSE=" << rmse
<< ", mean=" << error_mean << ", stdev=" << sqrt(error_var)
<< " (max,min)=" << max_error << "," << min_error << " [Chips]"
<< std::endl;
std::cout.precision(ss);
}
TEST_F(GpsL1CADllPllTrackingTestFpga, ValidationOfResultsFpga)
{
configure_generator();
// DO not generate signal raw signal samples and observations RINEX file by default
// generate_signal();
std::chrono::time_point<std::chrono::system_clock> start;
std::chrono::time_point<std::chrono::system_clock> end;
std::chrono::duration<double> elapsed_seconds(0);
configure_receiver();
// open true observables log file written by the simulator
Tracking_True_Obs_Reader true_obs_data;
int test_satellite_PRN = FLAGS_test_satellite_PRN;
std::cout << "Testing satellite PRN=" << test_satellite_PRN << std::endl;
std::string true_obs_file = std::string("./gps_l1_ca_obs_prn");
true_obs_file.append(std::to_string(test_satellite_PRN));
true_obs_file.append(".dat");
ASSERT_NO_THROW(
{
if (true_obs_data.open_obs_file(true_obs_file) == false)
{
throw std::exception();
};
})
<< "Failure opening true observables file";
top_block = gr::make_top_block("Tracking test");
// std::shared_ptr<GpsL1CaDllPllCAidTrackingFpga> tracking = std::make_shared<GpsL1CaDllPllCAidTrackingFpga> (config.get(), "Tracking_1C", 1, 1);
std::shared_ptr<GpsL1CaDllPllTrackingFpga> tracking = std::make_shared<GpsL1CaDllPllTrackingFpga>(config.get(), "Tracking_1C", 1, 1);
auto msg_rx = GpsL1CADllPllTrackingTestFpga_msg_rx_make();
// load acquisition data based on the first epoch of the true observations
ASSERT_NO_THROW(
{
if (true_obs_data.read_binary_obs() == false)
{
throw std::exception();
};
})
<< "Failure reading true observables file";
// restart the epoch counter
true_obs_data.restart();
std::cout << "Initial Doppler [Hz]=" << true_obs_data.doppler_l1_hz
<< " Initial code delay [Chips]=" << true_obs_data.prn_delay_chips
<< std::endl;
gnss_synchro.Acq_delay_samples = (GPS_L1_CA_CODE_LENGTH_CHIPS - true_obs_data.prn_delay_chips / GPS_L1_CA_CODE_LENGTH_CHIPS) * baseband_sampling_freq * GPS_L1_CA_CODE_PERIOD_S;
gnss_synchro.Acq_doppler_hz = true_obs_data.doppler_l1_hz;
gnss_synchro.Acq_samplestamp_samples = 0;
ASSERT_NO_THROW(
{
tracking->set_channel(gnss_synchro.Channel_ID);
})
<< "Failure setting channel.";
ASSERT_NO_THROW(
{
tracking->set_gnss_synchro(&gnss_synchro);
})
<< "Failure setting gnss_synchro.";
ASSERT_NO_THROW(
{
tracking->connect(top_block);
})
<< "Failure connecting tracking to the top_block.";
ASSERT_NO_THROW(
{
gr::blocks::null_sink::sptr sink = gr::blocks::null_sink::make(sizeof(Gnss_Synchro));
top_block->connect(tracking->get_right_block(), 0, sink, 0);
top_block->msg_connect(tracking->get_right_block(), pmt::mp("events"), msg_rx, pmt::mp("events"));
})
<< "Failure connecting the blocks of tracking test.";
tracking->start_tracking();
// assemble again the file name in a null terminated string (not available by default in the main program flow)
std::string file = "./" + filename_raw_data;
const char *file_name = file.c_str();
// start thread that sends the DMA samples to the FPGA
boost::thread t{sending_thread, top_block, file_name};
EXPECT_NO_THROW(
{
start = std::chrono::system_clock::now();
top_block->run(); // Start threads and wait
// tracking->reset(); // unlock the channel
end = std::chrono::system_clock::now();
elapsed_seconds = end - start;
})
<< "Failure running the top_block.";
// wait until child thread terminates
t.join();
// check results
// load the true values
int64_t nepoch = true_obs_data.num_epochs();
std::cout << "True observation epochs=" << nepoch << std::endl;
arma::vec true_timestamp_s = arma::zeros(nepoch, 1);
arma::vec true_acc_carrier_phase_cycles = arma::zeros(nepoch, 1);
arma::vec true_Doppler_Hz = arma::zeros(nepoch, 1);
arma::vec true_prn_delay_chips = arma::zeros(nepoch, 1);
arma::vec true_tow_s = arma::zeros(nepoch, 1);
int64_t epoch_counter = 0;
while (true_obs_data.read_binary_obs())
{
true_timestamp_s(epoch_counter) = true_obs_data.signal_timestamp_s;
true_acc_carrier_phase_cycles(epoch_counter) = true_obs_data.acc_carrier_phase_cycles;
true_Doppler_Hz(epoch_counter) = true_obs_data.doppler_l1_hz;
true_prn_delay_chips(epoch_counter) = true_obs_data.prn_delay_chips;
true_tow_s(epoch_counter) = true_obs_data.tow;
epoch_counter++;
}
// load the measured values
Tracking_Dump_Reader trk_dump;
ASSERT_NO_THROW(
{
if (trk_dump.open_obs_file(std::string("./tracking_ch_0.dat")) == false)
{
throw std::exception();
};
})
<< "Failure opening tracking dump file";
nepoch = trk_dump.num_epochs();
std::cout << "Measured observation epochs=" << nepoch << std::endl;
arma::vec trk_timestamp_s = arma::zeros(nepoch, 1);
arma::vec trk_acc_carrier_phase_cycles = arma::zeros(nepoch, 1);
arma::vec trk_Doppler_Hz = arma::zeros(nepoch, 1);
arma::vec trk_prn_delay_chips = arma::zeros(nepoch, 1);
epoch_counter = 0;
while (trk_dump.read_binary_obs())
{
trk_timestamp_s(epoch_counter) = static_cast<double>(trk_dump.PRN_start_sample_count) / static_cast<double>(baseband_sampling_freq);
trk_acc_carrier_phase_cycles(epoch_counter) = trk_dump.acc_carrier_phase_rad / GPS_TWO_PI;
trk_Doppler_Hz(epoch_counter) = trk_dump.carrier_doppler_hz;
double delay_chips = GPS_L1_CA_CODE_LENGTH_CHIPS - GPS_L1_CA_CODE_LENGTH_CHIPS * (fmod((static_cast<double>(trk_dump.PRN_start_sample_count) + trk_dump.aux1) / static_cast<double>(baseband_sampling_freq), 1.0e-3) / 1.0e-3);
trk_prn_delay_chips(epoch_counter) = delay_chips;
epoch_counter++;
}
// Align initial measurements and cut the tracking pull-in transitory
double pull_in_offset_s = 1.0;
arma::uvec initial_meas_point = arma::find(trk_timestamp_s >= (true_timestamp_s(0) + pull_in_offset_s), 1, "first");
trk_timestamp_s = trk_timestamp_s.subvec(initial_meas_point(0), trk_timestamp_s.size() - 1);
trk_acc_carrier_phase_cycles = trk_acc_carrier_phase_cycles.subvec(initial_meas_point(0), trk_acc_carrier_phase_cycles.size() - 1);
trk_Doppler_Hz = trk_Doppler_Hz.subvec(initial_meas_point(0), trk_Doppler_Hz.size() - 1);
trk_prn_delay_chips = trk_prn_delay_chips.subvec(initial_meas_point(0), trk_prn_delay_chips.size() - 1);
check_results_doppler(true_timestamp_s, true_Doppler_Hz, trk_timestamp_s, trk_Doppler_Hz);
check_results_codephase(true_timestamp_s, true_prn_delay_chips, trk_timestamp_s, trk_prn_delay_chips);
check_results_acc_carrier_phase(true_timestamp_s,
true_acc_carrier_phase_cycles, trk_timestamp_s,
trk_acc_carrier_phase_cycles);
std::cout << "Signal tracking completed in " << elapsed_seconds.count() * 1e6 << " microseconds" << std::endl;
}
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