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Add a simple CN0 smoother

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This commit is contained in:
Carles Fernandez
2019-04-25 08:50:21 +02:00
parent 52ae97ed4e
commit 50d4db9c05
5 changed files with 221 additions and 3 deletions
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10
src/algorithms/tracking/gnuradio_blocks/dll_pll_veml_tracking.cc
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@@ -439,6 +439,7 @@ dll_pll_veml_tracking::dll_pll_veml_tracking(const Dll_Pll_Conf &conf_) : gr::bl
d_carrier_lock_fail_counter = 0;
d_carrier_lock_threshold = trk_parameters.carrier_lock_th;
d_Prompt_Data = static_cast<gr_complex *>(volk_gnsssdr_malloc(sizeof(gr_complex), volk_gnsssdr_get_alignment()));
d_cn0_smoother = Exponential_Smoother();
d_acquisition_gnss_synchro = nullptr;
d_channel = 0;
@@ -848,9 +849,12 @@ bool dll_pll_veml_tracking::cn0_and_tracking_lock_status(double coh_integration_
d_cn0_estimation_counter++;
return true;
}
d_cn0_estimation_counter = 0;
d_Prompt_buffer[d_cn0_estimation_counter % trk_parameters.cn0_samples] = d_P_accu;
d_cn0_estimation_counter++;
// Code lock indicator
d_CN0_SNV_dB_Hz = cn0_svn_estimator(d_Prompt_buffer, trk_parameters.cn0_samples, coh_integration_time_s);
double d_CN0_SNV_dB_Hz_raw = cn0_svn_estimator(d_Prompt_buffer, trk_parameters.cn0_samples, coh_integration_time_s);
d_CN0_SNV_dB_Hz = d_cn0_smoother.smooth(d_CN0_SNV_dB_Hz_raw);
// Carrier lock indicator
d_carrier_lock_test = carrier_lock_detector(d_Prompt_buffer, trk_parameters.cn0_samples);
// Loss of lock detection
@@ -1593,7 +1597,7 @@ int dll_pll_veml_tracking::general_work(int noutput_items __attribute__((unused)
DLOG(INFO) << "Number of samples between Acquisition and Tracking = " << acq_trk_diff_samples << " ( " << acq_trk_diff_seconds << " s)";
DLOG(INFO) << "PULL-IN Doppler [Hz] = " << d_carrier_doppler_hz
<< ". PULL-IN Code Phase [samples] = " << d_acq_code_phase_samples;
d_cn0_smoother.reset();
consume_each(samples_offset); // shift input to perform alignment with local replica
return 0;
}

2
src/algorithms/tracking/gnuradio_blocks/dll_pll_veml_tracking.h
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@@ -34,6 +34,7 @@
#include "cpu_multicorrelator_real_codes.h"
#include "dll_pll_conf.h"
#include "exponential_smoother.h"
#include "tracking_FLL_PLL_filter.h" // for PLL/FLL filter
#include "tracking_loop_filter.h" // for DLL filter
#include <boost/circular_buffer.hpp>
@@ -197,6 +198,7 @@ private:
double d_carrier_lock_threshold;
boost::circular_buffer<gr_complex> d_Prompt_circular_buffer;
gr_complex *d_Prompt_buffer;
Exponential_Smoother d_cn0_smoother;
// file dump
std::ofstream d_dump_file;