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Carrier phase observable bug fix for GPS L1 CA trackings, new GPS L1 carrier aided tracking using nex multitap correlator library, and some CUDA multitap correlator performance improvements

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This commit is contained in:
Javier Arribas
2015-11-30 11:41:42 +01:00
parent 6336556163
commit 8c22e5846d
41 changed files with 2487 additions and 814 deletions
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16
src/algorithms/telemetry_decoder/gnuradio_blocks/gps_l1_ca_telemetry_decoder_cc.cc
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@@ -135,6 +135,7 @@ gps_l1_ca_telemetry_decoder_cc::gps_l1_ca_telemetry_decoder_cc(
d_decimation_output_factor = 1;
d_channel = 0;
Prn_timestamp_at_preamble_ms = 0.0;
flag_PLL_180_deg_phase_locked=false;
//set_history(d_samples_per_bit*8); // At least a history of 8 bits are needed to correlate with the preamble
}
@@ -224,6 +225,13 @@ int gps_l1_ca_telemetry_decoder_cc::general_work (int noutput_items, gr_vector_i
if (!d_flag_frame_sync)
{
d_flag_frame_sync = true;
if (corr_value<0)
{
flag_PLL_180_deg_phase_locked=true; //PLL is locked to opposite phase!
std::cout<<"PLL in opposite phase for Sat "<<this->d_satellite.get_PRN()<<std::endl;
}else{
flag_PLL_180_deg_phase_locked=false;
}
LOG(INFO) <<" Frame sync SAT " << this->d_satellite << " with preamble start at " << d_preamble_time_seconds << " [s]";
}
}
@@ -313,7 +321,7 @@ int gps_l1_ca_telemetry_decoder_cc::general_work (int noutput_items, gr_vector_i
// Sice we detected the preable, then, we are in the last symbol of that preamble, or just at the start of the first subframe symbol.
{
d_TOW_at_Preamble = d_GPS_FSM.d_nav.d_TOW + GPS_SUBFRAME_SECONDS; //we decoded the current TOW when the last word of the subframe arrive, so, we have a lag of ONE SUBFRAME
d_TOW_at_current_symbol = d_TOW_at_Preamble;//GPS_L1_CA_CODE_PERIOD;// + (double)GPS_CA_PREAMBLE_LENGTH_BITS/(double)GPS_CA_TELEMETRY_RATE_BITS_SECOND;
d_TOW_at_current_symbol = d_TOW_at_Preamble;
Prn_timestamp_at_preamble_ms = in[0][0].Tracking_timestamp_secs * 1000.0;
if (flag_TOW_set == false)
{
@@ -327,13 +335,17 @@ int gps_l1_ca_telemetry_decoder_cc::general_work (int noutput_items, gr_vector_i
current_synchro_data.d_TOW = d_TOW_at_Preamble;
current_synchro_data.d_TOW_at_current_symbol = d_TOW_at_current_symbol;
current_synchro_data.d_TOW_hybrid_at_current_symbol = current_synchro_data.d_TOW_at_current_symbol; // to be used in the hybrid configuration
current_synchro_data.Flag_valid_word = (d_flag_frame_sync == true and d_flag_parity == true and flag_TOW_set == true);
current_synchro_data.Flag_preamble = d_flag_preamble;
current_synchro_data.Prn_timestamp_ms = in[0][0].Tracking_timestamp_secs * 1000.0;
current_synchro_data.Prn_timestamp_at_preamble_ms = Prn_timestamp_at_preamble_ms;
if (flag_PLL_180_deg_phase_locked==true)
{
//correct the accumulated phase for the costas loop phase shift, if required
current_synchro_data.Carrier_phase_rads+=GPS_PI;
}
if(d_dump == true)
{
// MULTIPLEXED FILE RECORDING - Record results to file

7
src/algorithms/telemetry_decoder/gnuradio_blocks/gps_l1_ca_telemetry_decoder_cc.h
View File

@@ -35,6 +35,7 @@
#include <string>
#include <gnuradio/block.h>
#include <gnuradio/msg_queue.h>
#include <deque>
#include "GPS_L1_CA.h"
#include "gps_l1_ca_subframe_fsm.h"
#include "concurrent_queue.h"
@@ -142,8 +143,14 @@ private:
double d_TOW_at_Preamble;
double d_TOW_at_current_symbol;
std::deque<double> d_symbol_TOW_queue_s;
// Doppler and Phase accumulator queue for interpolation in Observables
std::deque<double> d_carrier_doppler_queue_hz;
std::deque<double> d_acc_carrier_phase_queue_rads;
double Prn_timestamp_at_preamble_ms;
bool flag_TOW_set;
bool flag_PLL_180_deg_phase_locked;
std::string d_dump_filename;
std::ofstream d_dump_file;