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Release candidate of the GPS L1 C/A telemetry decoder supporting variable tracking correlation length

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This commit is contained in:
Javier Arribas
2016-03-22 18:07:12 +01:00
parent 083350bd61
commit 500dc59516
7 changed files with 69 additions and 117 deletions
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14
src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_dll_pll_c_aid_tracking_cc.cc
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@@ -93,7 +93,7 @@ void gps_l1_ca_dll_pll_c_aid_tracking_cc::msg_handler_preamble_index(pmt::pmt_t
DLOG(INFO) << "Extended correlation enabled for Tracking CH " << d_channel << ": Satellite " << Gnss_Satellite(systemName[sys], d_acquisition_gnss_synchro->PRN)<< std::endl;
if (d_enable_extended_integration==false) //avoid re-setting preamble indicator
{
d_preamble_index=pmt::to_long(msg);
d_preamble_timestamp_s=pmt::to_double(msg);
d_enable_extended_integration=true;
d_preamble_synchronized=false;
}
@@ -117,9 +117,9 @@ gps_l1_ca_dll_pll_c_aid_tracking_cc::gps_l1_ca_dll_pll_c_aid_tracking_cc(
gr::io_signature::make(1, 1, sizeof(Gnss_Synchro)))
{
// create asynchronous message ports
this->message_port_register_in(pmt::mp("preamble_index"));
this->message_port_register_in(pmt::mp("preamble_timestamp_s"));
this->set_msg_handler(pmt::mp("preamble_index"),
this->set_msg_handler(pmt::mp("preamble_timestamp_s"),
boost::bind(&gps_l1_ca_dll_pll_c_aid_tracking_cc::msg_handler_preamble_index, this, _1));
@@ -173,8 +173,7 @@ gps_l1_ca_dll_pll_c_aid_tracking_cc::gps_l1_ca_dll_pll_c_aid_tracking_cc(
// sample synchronization
d_sample_counter = 0; //(from trk to tlm)
// symbol synchronization (from tlm to trk)
d_symbol_counter =0;
//d_sample_counter_seconds = 0;
d_acq_sample_stamp = 0;
@@ -351,7 +350,6 @@ int gps_l1_ca_dll_pll_c_aid_tracking_cc::general_work (int noutput_items, gr_vec
current_synchro_data.Flag_valid_symbol_output = false;
*out[0] = current_synchro_data;
consume_each(samples_offset); //shift input to perform alignment with local replica
d_symbol_counter++;
return 1;
}
@@ -379,7 +377,7 @@ int gps_l1_ca_dll_pll_c_aid_tracking_cc::general_work (int noutput_items, gr_vec
bool enable_dll_pll;
if (d_enable_extended_integration==true)
{
long int symbol_diff=d_symbol_counter-d_preamble_index;
long int symbol_diff=round(1000.0*((static_cast<double>(d_sample_counter) + d_rem_code_phase_samples) / static_cast<double>(d_fs_in)-d_preamble_timestamp_s));
if (symbol_diff>0 and symbol_diff % d_extend_correlation_ms == 0)
{
// compute coherent integration and enable tracking loop
@@ -638,6 +636,7 @@ int gps_l1_ca_dll_pll_c_aid_tracking_cc::general_work (int noutput_items, gr_vec
current_synchro_data.System = {'G'};
current_synchro_data.Flag_valid_pseudorange = false;
current_synchro_data.correlation_length_ms=1;
*out[0] = current_synchro_data;
}
@@ -703,7 +702,6 @@ int gps_l1_ca_dll_pll_c_aid_tracking_cc::general_work (int noutput_items, gr_vec
{
LOG(WARNING) << "noutput_items = 0";
}
d_symbol_counter++;
return 1; //output tracking result ALWAYS even in the case of d_enable_tracking==false
}

3
src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_dll_pll_c_aid_tracking_cc.h
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@@ -174,8 +174,7 @@ private:
std::deque<gr_complex> d_E_history;
std::deque<gr_complex> d_P_history;
std::deque<gr_complex> d_L_history;
long int d_preamble_index;
long int d_symbol_counter;
double d_preamble_timestamp_s;
int d_extend_correlation_ms;
bool d_enable_extended_integration;
bool d_preamble_synchronized;