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Implementing RX clock correction feedback in PVT and Observables

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This commit is contained in:
Javier Arribas 2019-04-23 17:31:26 +02:00
parent 2e69b62ac0
commit 485027b7af
4 changed files with 1751 additions and 1688 deletions
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3342
src/algorithms/PVT/gnuradio_blocks/rtklib_pvt_gs.cc
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File diff suppressed because it is too large Load Diff

91
src/algorithms/observables/gnuradio_blocks/hybrid_observables_gs.cc
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@ -52,6 +52,33 @@ hybrid_observables_gs_sptr hybrid_observables_gs_make(unsigned int nchannels_in,
return hybrid_observables_gs_sptr(new hybrid_observables_gs(nchannels_in, nchannels_out, dump, dump_mat, std::move(dump_filename)));
}
void hybrid_observables_gs::msg_handler_pvt_to_observables(const pmt::pmt_t &msg)
{
gr::thread::scoped_lock lock(d_setlock); // require mutex with work function called by the scheduler
try
{
if (pmt::any_ref(msg).type() == typeid(double))
{
double new_rx_clock_offset_s;
new_rx_clock_offset_s = boost::any_cast<double>(pmt::any_ref(msg));
T_rx_offset_ms = new_rx_clock_offset_s * 1000.0;
T_rx_TOW_ms = T_rx_TOW_ms - static_cast<int>(round(T_rx_offset_ms));
T_rx_remnant_to_20ms = (T_rx_TOW_ms % 20);
//d_Rx_clock_buffer.clear(); // Clear all the elements in the buffer
for (uint32_t n = 0; n < d_nchannels_out; n++)
{
d_gnss_synchro_history->clear(n);
}
LOG(INFO) << "Corrected new RX Time offset: " << T_rx_offset_ms << "[ms]";
}
}
catch (boost::bad_any_cast &e)
{
LOG(WARNING) << "msg_handler_pvt_to_observables Bad any cast!";
}
}
hybrid_observables_gs::hybrid_observables_gs(uint32_t nchannels_in,
uint32_t nchannels_out,
@ -61,12 +88,16 @@ hybrid_observables_gs::hybrid_observables_gs(uint32_t nchannels_in,
gr::io_signature::make(nchannels_in, nchannels_in, sizeof(Gnss_Synchro)),
gr::io_signature::make(nchannels_out, nchannels_out, sizeof(Gnss_Synchro)))
{
// PVT input message port
this->message_port_register_in(pmt::mp("pvt_to_observables"));
this->set_msg_handler(pmt::mp("pvt_to_observables"), boost::bind(&hybrid_observables_gs::msg_handler_pvt_to_observables, this, _1));
d_dump = dump;
d_dump_mat = dump_mat and d_dump;
d_dump_filename = std::move(dump_filename);
d_nchannels_out = nchannels_out;
d_nchannels_in = nchannels_in;
T_rx_clock_step_samples = 0U;
T_rx_offset_ms = 0;
d_gnss_synchro_history = new Gnss_circular_deque<Gnss_Synchro>(500, d_nchannels_out);
// ############# ENABLE DATA FILE LOG #################
@ -114,6 +145,7 @@ hybrid_observables_gs::hybrid_observables_gs(uint32_t nchannels_in,
}
}
T_rx_TOW_ms = 0U;
T_rx_remnant_to_20ms = 0;
T_rx_step_ms = 20; //read from config at the adapter GNSS-SDR.observable_interval_ms!!
T_rx_TOW_set = false;
@ -410,6 +442,17 @@ bool hybrid_observables_gs::interp_trk_obs(Gnss_Synchro &interpolated_obs, const
interpolated_obs.Carrier_Doppler_hz = d_gnss_synchro_history->at(ch, t1_idx).Carrier_Doppler_hz + (d_gnss_synchro_history->at(ch, t2_idx).Carrier_Doppler_hz - d_gnss_synchro_history->at(ch, t1_idx).Carrier_Doppler_hz) * time_factor;
// TOW INTERPOLATION
interpolated_obs.interp_TOW_ms = static_cast<double>(d_gnss_synchro_history->at(ch, t1_idx).TOW_at_current_symbol_ms) + (static_cast<double>(d_gnss_synchro_history->at(ch, t2_idx).TOW_at_current_symbol_ms) - static_cast<double>(d_gnss_synchro_history->at(ch, t1_idx).TOW_at_current_symbol_ms)) * time_factor;
// LOG(INFO) << "Channel " << ch << " int idx: " << t1_idx << " TOW Int: " << interpolated_obs.interp_TOW_ms
// << " TOW p1 : " << d_gnss_synchro_history->at(ch, t1_idx).TOW_at_current_symbol_ms
// << " TOW p2: "
// << d_gnss_synchro_history->at(ch, t2_idx).TOW_at_current_symbol_ms
// << " t2-t1: "
// << d_gnss_synchro_history->at(ch, t2_idx).RX_time - d_gnss_synchro_history->at(ch, t1_idx).RX_time
// << " trx - t1: "
// << T_rx_s - d_gnss_synchro_history->at(ch, t1_idx).RX_time;
//
// std::cout << "Rx samplestamp: " << T_rx_s << " Channel " << ch << " interp buff idx " << nearest_element
// << " ,diff: " << old_abs_diff << " samples (" << static_cast<double>(old_abs_diff) / static_cast<double>(d_gnss_synchro_history->at(ch, nearest_element).fs) << " s)\n";
@ -459,6 +502,7 @@ void hybrid_observables_gs::update_TOW(const std::vector<Gnss_Synchro> &data)
}
}
T_rx_TOW_ms = TOW_ref - (TOW_ref % 20);
T_rx_remnant_to_20ms = 0;
}
else
{
@ -477,13 +521,14 @@ void hybrid_observables_gs::compute_pranges(std::vector<Gnss_Synchro> &data)
// std::cout.precision(17);
// std::cout << " T_rx_TOW_ms: " << static_cast<double>(T_rx_TOW_ms) << std::endl;
std::vector<Gnss_Synchro>::iterator it;
double current_T_rx_TOW_s = (static_cast<double>(T_rx_TOW_ms - T_rx_remnant_to_20ms) + GPS_STARTOFFSET_MS) / 1000.0;
for (it = data.begin(); it != data.end(); it++)
{
if (it->Flag_valid_word)
{
double traveltime_s = (static_cast<double>(T_rx_TOW_ms) - it->interp_TOW_ms + GPS_STARTOFFSET_MS) / 1000.0;
//todo: check what happens during the week rollover (TOW rollover at 604800000s)
it->RX_time = (static_cast<double>(T_rx_TOW_ms) + GPS_STARTOFFSET_MS) / 1000.0;
double traveltime_s = current_T_rx_TOW_s - it->interp_TOW_ms / 1000.0;
//todo: check what happens during the week rollover (TOW rollover at 604800000ms)
it->RX_time = current_T_rx_TOW_s;
it->Pseudorange_m = traveltime_s * SPEED_OF_LIGHT;
it->Flag_valid_pseudorange = true;
// debug code
@ -491,17 +536,11 @@ void hybrid_observables_gs::compute_pranges(std::vector<Gnss_Synchro> &data)
// std::cout << "[" << it->Channel_ID << "] interp_TOW_ms: " << it->interp_TOW_ms << std::endl;
// std::cout << "[" << it->Channel_ID << "] Diff T_rx_TOW_ms - interp_TOW_ms: " << static_cast<double>(T_rx_TOW_ms) - it->interp_TOW_ms << std::endl;
}
else
{
it->RX_time = current_T_rx_TOW_s;
}
}
// for (it = data.begin(); it != data.end(); it++)
// {
// if (it->Flag_valid_word)
// {
// std::cout << "[" << it->Channel_ID << "] Pseudorange_m: " << it->Pseudorange_m << std::endl;
// }
// }
// std::cout << std::endl;
// usleep(1000);
}
@ -517,12 +556,6 @@ int hybrid_observables_gs::general_work(int noutput_items __attribute__((unused)
if (ninput_items[d_nchannels_in - 1] > 0)
{
d_Rx_clock_buffer.push_back(in[d_nchannels_in - 1][0].Tracking_sample_counter);
if (T_rx_clock_step_samples == 0)
{
T_rx_clock_step_samples = std::round(static_cast<double>(in[d_nchannels_in - 1][0].fs) * 1e-3); // 1 ms
LOG(INFO) << "Observables clock step samples set to " << T_rx_clock_step_samples;
}
// Consume one item from the clock channel (last of the input channels)
consume(d_nchannels_in - 1, 1);
}
@ -541,6 +574,7 @@ int hybrid_observables_gs::general_work(int noutput_items __attribute__((unused)
if (d_gnss_synchro_history->front(n).PRN != in[n][m].PRN)
{
d_gnss_synchro_history->clear(n);
// LOG(INFO) << "Channel " << d_gnss_synchro_history->front(n).Channel_ID << " changed satellite to PRN " << in[n][m].PRN;
}
}
d_gnss_synchro_history->push_back(n, in[n][m]);
@ -557,7 +591,9 @@ int hybrid_observables_gs::general_work(int noutput_items __attribute__((unused)
for (uint32_t n = 0; n < d_nchannels_out; n++)
{
Gnss_Synchro interpolated_gnss_synchro{};
if (!interp_trk_obs(interpolated_gnss_synchro, n, d_Rx_clock_buffer.front()))
uint32_t T_rx_remnant_to_20ms_samples = T_rx_remnant_to_20ms * in[d_nchannels_in - 1][0].fs / 1000;
if (!interp_trk_obs(interpolated_gnss_synchro, n, d_Rx_clock_buffer.front() - T_rx_remnant_to_20ms_samples))
{
// Produce an empty observation
interpolated_gnss_synchro = Gnss_Synchro();
@ -574,9 +610,20 @@ int hybrid_observables_gs::general_work(int noutput_items __attribute__((unused)
epoch_data.push_back(interpolated_gnss_synchro);
}
if (n_valid > 0)
if (T_rx_TOW_set)
{
update_TOW(epoch_data);
}
else
{
if (n_valid > 0)
{
update_TOW(epoch_data);
}
}
if (n_valid > 0)
{
compute_pranges(epoch_data);
}

4
src/algorithms/observables/gnuradio_blocks/hybrid_observables_gs.h
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@ -68,6 +68,7 @@ private:
friend hybrid_observables_gs_sptr
hybrid_observables_gs_make(uint32_t nchannels_in, uint32_t nchannels_out, bool dump, bool dump_mat, std::string dump_filename);
hybrid_observables_gs(uint32_t nchannels_in, uint32_t nchannels_out, bool dump, bool dump_mat, std::string dump_filename);
void msg_handler_pvt_to_observables(const pmt::pmt_t& msg);
bool interpolate_data(Gnss_Synchro& out, const uint32_t& ch, const double& ti);
bool interp_trk_obs(Gnss_Synchro& interpolated_obs, const uint32_t& ch, const uint64_t& rx_clock);
double compute_T_rx_s(const Gnss_Synchro& a);
@ -79,11 +80,12 @@ private:
boost::circular_buffer<uint64_t> d_Rx_clock_buffer;
//Tracking observable history
Gnss_circular_deque<Gnss_Synchro>* d_gnss_synchro_history;
uint32_t T_rx_clock_step_samples;
//rx time follow GPST
bool T_rx_TOW_set;
uint32_t T_rx_TOW_ms;
uint32_t T_rx_remnant_to_20ms;
uint32_t T_rx_step_ms;
double T_rx_offset_ms;
bool d_dump;
bool d_dump_mat;
uint32_t d_nchannels_in;

2
src/core/receiver/gnss_flowgraph.cc
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@ -677,6 +677,7 @@ void GNSSFlowgraph::connect()
top_block_->connect(observables_->get_right_block(), i, pvt_->get_left_block(), i);
top_block_->msg_connect(channels_.at(i)->get_right_block(), pmt::mp("telemetry"), pvt_->get_left_block(), pmt::mp("telemetry"));
}
top_block_->msg_connect(pvt_->get_left_block(), pmt::mp("pvt_to_observables"), observables_->get_right_block(), pmt::mp("pvt_to_observables"));
}
catch (const std::exception& e)
{
@ -948,6 +949,7 @@ void GNSSFlowgraph::disconnect()
}
top_block_->msg_disconnect(channels_.at(i)->get_right_block(), pmt::mp("telemetry"), pvt_->get_left_block(), pmt::mp("telemetry"));
}
top_block_->msg_disconnect(pvt_->get_left_block(), pmt::mp("pvt_to_observables"), observables_->get_right_block(), pmt::mp("pvt_to_observables"));
}
catch (const std::exception& e)
{