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feature: Adding code to fix coherent integration in GLONASS L1 C/A

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Debugs code to fix GLONASS coherent integration. Adds message handling
from telemetry decoding to signal tracking modules. Bug on poor track
performance stills need to be determine.
This commit is contained in:
Damian Miralles
2017-11-20 14:52:37 -07:00
parent 1c03579e61
commit 4a8182af26
6 changed files with 148 additions and 11 deletions
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src/algorithms/telemetry_decoder/gnuradio_blocks/glonass_l1_ca_telemetry_decoder_cc.cc
+8
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@@ -112,6 +112,7 @@ glonass_l1_ca_telemetry_decoder_cc::glonass_l1_ca_telemetry_decoder_cc(
d_flag_preamble = false;
d_channel = 0;
flag_TOW_set = false;
d_preamble_time_samples = 0;
}
@@ -274,6 +275,8 @@ int glonass_l1_ca_telemetry_decoder_cc::general_work (int noutput_items __attrib
LOG(INFO) << "Preamble detection for GLONASS L1 C/A SAT " << this->d_satellite;
// Enter into frame pre-detection status
d_stat = 1;
d_preamble_time_samples = d_symbol_history.at(0).Tracking_sample_counter; // record the preamble sample stamp
}
}
else if (d_stat == 1) // posible preamble lock
@@ -282,12 +285,17 @@ int glonass_l1_ca_telemetry_decoder_cc::general_work (int noutput_items __attrib
{
//check preamble separation
preamble_diff = d_sample_counter - d_preamble_index;
// Record the PRN start sample index associated to the preamble
d_preamble_time_samples = d_symbol_history.at(0).Tracking_sample_counter;
if (abs(preamble_diff - GLONASS_GNAV_PREAMBLE_PERIOD_SYMBOLS) == 0)
{
//try to decode frame
LOG(INFO) << "Starting string decoder for GLONASS L1 C/A SAT " << this->d_satellite;
d_preamble_index = d_sample_counter; //record the preamble sample stamp
d_stat = 2;
// send asynchronous message to tracking to inform of frame sync and extend correlation time
pmt::pmt_t value = pmt::from_double(static_cast<double>(d_preamble_time_samples) / static_cast<double>(d_symbol_history.at(0).fs) - 0.001);
this->message_port_pub(pmt::mp("preamble_timestamp_s"), value);
}
else
{
src/algorithms/telemetry_decoder/gnuradio_blocks/glonass_l1_ca_telemetry_decoder_cc.h
+3
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@@ -79,6 +79,9 @@ private:
void decode_string(double *symbols, int frame_length);
//!< Help with coherent tracking
double d_preamble_time_samples;
//!< Preamble decoding
unsigned short int d_preambles_bits[GLONASS_GNAV_PREAMBLE_LENGTH_BITS];
int *d_preambles_symbols;