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Improving GPS L1 CA telemetry decoder reliability

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This commit is contained in:
Javier Arribas 2018-07-26 19:56:10 +02:00
parent 83413f2eaf
commit 81fc5adcd7
1 changed files with 39 additions and 32 deletions
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71
src/algorithms/telemetry_decoder/gnuradio_blocks/gps_l1_ca_telemetry_decoder_cc.cc
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@ -259,41 +259,48 @@ bool gps_l1_ca_telemetry_decoder_cc::decode_subframe()
if (CRC_ok)
{
int subframe_ID = d_nav.subframe_decoder(subframe); //decode the subframe
std::cout << "New GPS NAV message received in channel " << this->d_channel << ": "
<< "subframe "
<< subframe_ID << " from satellite "
<< Gnss_Satellite(std::string("GPS"), d_nav.i_satellite_PRN) << std::endl;
switch (subframe_ID)
if (subframe_ID > 0 and subframe_ID < 6)
{
case 3: //we have a new set of ephemeris data for the current SV
if (d_nav.satellite_validation() == true)
std::cout << "New GPS NAV message received in channel " << this->d_channel << ": "
<< "subframe "
<< subframe_ID << " from satellite "
<< Gnss_Satellite(std::string("GPS"), d_nav.i_satellite_PRN) << std::endl;
switch (subframe_ID)
{
// get ephemeris object for this SV (mandatory)
std::shared_ptr<Gps_Ephemeris> tmp_obj = std::make_shared<Gps_Ephemeris>(d_nav.get_ephemeris());
this->message_port_pub(pmt::mp("telemetry"), pmt::make_any(tmp_obj));
case 3: //we have a new set of ephemeris data for the current SV
if (d_nav.satellite_validation() == true)
{
// get ephemeris object for this SV (mandatory)
std::shared_ptr<Gps_Ephemeris> tmp_obj = std::make_shared<Gps_Ephemeris>(d_nav.get_ephemeris());
this->message_port_pub(pmt::mp("telemetry"), pmt::make_any(tmp_obj));
}
break;
case 4: // Possible IONOSPHERE and UTC model update (page 18)
if (d_nav.flag_iono_valid == true)
{
std::shared_ptr<Gps_Iono> tmp_obj = std::make_shared<Gps_Iono>(d_nav.get_iono());
this->message_port_pub(pmt::mp("telemetry"), pmt::make_any(tmp_obj));
}
if (d_nav.flag_utc_model_valid == true)
{
std::shared_ptr<Gps_Utc_Model> tmp_obj = std::make_shared<Gps_Utc_Model>(d_nav.get_utc_model());
this->message_port_pub(pmt::mp("telemetry"), pmt::make_any(tmp_obj));
}
break;
case 5:
// get almanac (if available)
//TODO: implement almanac reader in navigation_message
break;
default:
break;
}
break;
case 4: // Possible IONOSPHERE and UTC model update (page 18)
if (d_nav.flag_iono_valid == true)
{
std::shared_ptr<Gps_Iono> tmp_obj = std::make_shared<Gps_Iono>(d_nav.get_iono());
this->message_port_pub(pmt::mp("telemetry"), pmt::make_any(tmp_obj));
}
if (d_nav.flag_utc_model_valid == true)
{
std::shared_ptr<Gps_Utc_Model> tmp_obj = std::make_shared<Gps_Utc_Model>(d_nav.get_utc_model());
this->message_port_pub(pmt::mp("telemetry"), pmt::make_any(tmp_obj));
}
break;
case 5:
// get almanac (if available)
//TODO: implement almanac reader in navigation_message
break;
default:
break;
d_flag_new_tow_available = true;
}
else
{
return false;
}
d_flag_new_tow_available = true;
}
return subframe_synchro_confirmation;
@ -419,7 +426,7 @@ int gps_l1_ca_telemetry_decoder_cc::general_work(int noutput_items __attribute__
//2. Add the telemetry decoder information
if (this->d_flag_preamble == true and d_flag_new_tow_available == true)
{
d_TOW_at_current_symbol_ms = static_cast<unsigned int>(d_nav.d_TOW) * 1000 + GPS_L1_CA_CODE_PERIOD_MS + GPS_CA_PREAMBLE_DURATION_MS;
d_TOW_at_current_symbol_ms = static_cast<unsigned int>(d_nav.d_TOW) * 1000 + GPS_CA_PREAMBLE_DURATION_MS;
d_TOW_at_Preamble_ms = d_TOW_at_current_symbol_ms;
flag_TOW_set = true;
d_flag_new_tow_available = false;