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Access elements of d_symbol_history without bound checking

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Carles Fernandez 2018-08-17 19:33:17 +02:00
parent 5d86e68b60
commit 3b43e62b29
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GPG Key ID: 4C583C52B0C3877D
1 changed files with 9 additions and 9 deletions
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18
src/algorithms/telemetry_decoder/gnuradio_blocks/gps_l1_ca_telemetry_decoder_cc.cc
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@ -321,7 +321,7 @@ int gps_l1_ca_telemetry_decoder_cc::general_work(int noutput_items __attribute__
// record the oldest subframe symbol before inserting a new symbol into the circular buffer // record the oldest subframe symbol before inserting a new symbol into the circular buffer
if (d_current_subframe_symbol < GPS_SUBFRAME_MS and d_symbol_history.size() > 0) if (d_current_subframe_symbol < GPS_SUBFRAME_MS and d_symbol_history.size() > 0)
{ {
d_subframe_symbols[d_current_subframe_symbol] = d_symbol_history.at(0).Prompt_I; d_subframe_symbols[d_current_subframe_symbol] = d_symbol_history[0].Prompt_I;
d_current_subframe_symbol++; d_current_subframe_symbol++;
} }
@ -337,9 +337,9 @@ int gps_l1_ca_telemetry_decoder_cc::general_work(int noutput_items __attribute__
// std::cout << "-------\n"; // std::cout << "-------\n";
for (uint32_t i = 0; i < GPS_CA_PREAMBLE_LENGTH_SYMBOLS; i++) for (uint32_t i = 0; i < GPS_CA_PREAMBLE_LENGTH_SYMBOLS; i++)
{ {
if (d_symbol_history.at(i).Flag_valid_symbol_output == true) if (d_symbol_history[i].Flag_valid_symbol_output == true)
{ {
if (d_symbol_history.at(i).Prompt_I < 0) // symbols clipping if (d_symbol_history[i].Prompt_I < 0) // symbols clipping
{ {
corr_value -= d_preambles_symbols[i]; corr_value -= d_preambles_symbols[i];
} }
@ -358,18 +358,18 @@ int gps_l1_ca_telemetry_decoder_cc::general_work(int noutput_items __attribute__
if (d_stat == 0) if (d_stat == 0)
{ {
// record the preamble sample stamp // record the preamble sample stamp
d_preamble_time_samples = d_symbol_history.at(0).Tracking_sample_counter; // record the preamble sample stamp d_preamble_time_samples = d_symbol_history[0].Tracking_sample_counter; // record the preamble sample stamp
DLOG(INFO) << "Preamble detection for SAT " << this->d_satellite << "d_symbol_history.at(0).Tracking_sample_counter=" << d_symbol_history.at(0).Tracking_sample_counter; DLOG(INFO) << "Preamble detection for SAT " << this->d_satellite << "d_symbol_history[0].Tracking_sample_counter=" << d_symbol_history[0].Tracking_sample_counter;
d_stat = 1; // enter into frame pre-detection status d_stat = 1; // enter into frame pre-detection status
} }
else if (d_stat == 1) // check 6 seconds of preamble separation else if (d_stat == 1) // check 6 seconds of preamble separation
{ {
preamble_diff_ms = std::round(((static_cast<double>(d_symbol_history.at(0).Tracking_sample_counter) - static_cast<double>(d_preamble_time_samples)) / static_cast<double>(d_symbol_history.at(0).fs)) * 1000.0); preamble_diff_ms = std::round(((static_cast<double>(d_symbol_history[0].Tracking_sample_counter) - static_cast<double>(d_preamble_time_samples)) / static_cast<double>(d_symbol_history[0].fs)) * 1000.0);
if (std::abs(preamble_diff_ms - GPS_SUBFRAME_MS) % GPS_SUBFRAME_MS == 0) if (std::abs(preamble_diff_ms - GPS_SUBFRAME_MS) % GPS_SUBFRAME_MS == 0)
{ {
DLOG(INFO) << "Preamble confirmation for SAT " << this->d_satellite; DLOG(INFO) << "Preamble confirmation for SAT " << this->d_satellite;
d_flag_preamble = true; d_flag_preamble = true;
d_preamble_time_samples = d_symbol_history.at(0).Tracking_sample_counter; // record the PRN start sample index associated to the preamble d_preamble_time_samples = d_symbol_history[0].Tracking_sample_counter; // record the PRN start sample index associated to the preamble
if (!d_flag_frame_sync) if (!d_flag_frame_sync)
{ {
d_flag_frame_sync = true; d_flag_frame_sync = true;
@ -383,7 +383,7 @@ int gps_l1_ca_telemetry_decoder_cc::general_work(int noutput_items __attribute__
flag_PLL_180_deg_phase_locked = false; flag_PLL_180_deg_phase_locked = false;
} }
DLOG(INFO) << " Frame sync SAT " << this->d_satellite << " with preamble start at " DLOG(INFO) << " Frame sync SAT " << this->d_satellite << " with preamble start at "
<< static_cast<double>(d_preamble_time_samples) / static_cast<double>(d_symbol_history.at(0).fs) << " [s]"; << static_cast<double>(d_preamble_time_samples) / static_cast<double>(d_symbol_history[0].fs) << " [s]";
} }
// try to decode the subframe: // try to decode the subframe:
@ -407,7 +407,7 @@ int gps_l1_ca_telemetry_decoder_cc::general_work(int noutput_items __attribute__
{ {
if (d_stat == 1) if (d_stat == 1)
{ {
preamble_diff_ms = round(((static_cast<double>(d_symbol_history.at(0).Tracking_sample_counter) - static_cast<double>(d_preamble_time_samples)) / static_cast<double>(d_symbol_history.at(0).fs)) * 1000.0); preamble_diff_ms = round(((static_cast<double>(d_symbol_history[0].Tracking_sample_counter) - static_cast<double>(d_preamble_time_samples)) / static_cast<double>(d_symbol_history[0].fs)) * 1000.0);
if (preamble_diff_ms > GPS_SUBFRAME_MS) if (preamble_diff_ms > GPS_SUBFRAME_MS)
{ {
DLOG(INFO) << "Lost of frame sync SAT " << this->d_satellite << " preamble_diff= " << preamble_diff_ms; DLOG(INFO) << "Lost of frame sync SAT " << this->d_satellite << " preamble_diff= " << preamble_diff_ms;