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Added IF handling to acq and tracking

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Only GPS L1 CA DLL PLL tracking for now. Still experimental.
This commit is contained in:
Cillian O'Driscoll 2015-11-26 13:33:13 +00:00
parent b95219dbc6
commit 518deb501a
2 changed files with 3 additions and 3 deletions
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2
src/algorithms/acquisition/gnuradio_blocks/pcps_acquisition_fine_doppler_cc.cc
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@ -201,7 +201,7 @@ void pcps_acquisition_fine_doppler_cc::update_carrier_wipeoff()
doppler_hz = d_config_doppler_min + d_doppler_step*doppler_index; doppler_hz = d_config_doppler_min + d_doppler_step*doppler_index;
// doppler search steps // doppler search steps
// compute the carrier doppler wipe-off signal and store it // compute the carrier doppler wipe-off signal and store it
phase_step_rad = static_cast<float>(GPS_TWO_PI) * doppler_hz / static_cast<float>(d_fs_in); phase_step_rad = static_cast<float>(GPS_TWO_PI) * ( d_freq + doppler_hz ) / static_cast<float>(d_fs_in);
d_grid_doppler_wipeoffs[doppler_index] = new gr_complex[d_fft_size]; d_grid_doppler_wipeoffs[doppler_index] = new gr_complex[d_fft_size];
fxp_nco(d_grid_doppler_wipeoffs[doppler_index], d_fft_size,0, phase_step_rad); fxp_nco(d_grid_doppler_wipeoffs[doppler_index], d_fft_size,0, phase_step_rad);
} }

4
src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_dll_pll_tracking_cc.cc
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@ -297,7 +297,7 @@ void Gps_L1_Ca_Dll_Pll_Tracking_cc::update_local_code()
void Gps_L1_Ca_Dll_Pll_Tracking_cc::update_local_carrier() void Gps_L1_Ca_Dll_Pll_Tracking_cc::update_local_carrier()
{ {
float sin_f, cos_f; float sin_f, cos_f;
float phase_step_rad = static_cast<float>(GPS_TWO_PI) * d_carrier_doppler_hz / static_cast<float>(d_fs_in); float phase_step_rad = static_cast<float>(GPS_TWO_PI) * ( d_if_freq + d_carrier_doppler_hz ) / static_cast<float>(d_fs_in);
int phase_step_rad_i = gr::fxpt::float_to_fixed(phase_step_rad); int phase_step_rad_i = gr::fxpt::float_to_fixed(phase_step_rad);
int phase_rad_i = gr::fxpt::float_to_fixed(d_rem_carr_phase_rad); int phase_rad_i = gr::fxpt::float_to_fixed(d_rem_carr_phase_rad);
@ -424,7 +424,7 @@ int Gps_L1_Ca_Dll_Pll_Tracking_cc::general_work (int noutput_items, gr_vector_in
//carrier phase accumulator for (K) doppler estimation //carrier phase accumulator for (K) doppler estimation
d_acc_carrier_phase_rad = d_acc_carrier_phase_rad + GPS_TWO_PI * d_carrier_doppler_hz * GPS_L1_CA_CODE_PERIOD; d_acc_carrier_phase_rad = d_acc_carrier_phase_rad + GPS_TWO_PI * d_carrier_doppler_hz * GPS_L1_CA_CODE_PERIOD;
//remanent carrier phase to prevent overflow in the code NCO //remanent carrier phase to prevent overflow in the code NCO
d_rem_carr_phase_rad = d_rem_carr_phase_rad + GPS_TWO_PI * d_carrier_doppler_hz * GPS_L1_CA_CODE_PERIOD; d_rem_carr_phase_rad = d_rem_carr_phase_rad + GPS_TWO_PI * ( d_if_freq + d_carrier_doppler_hz ) * GPS_L1_CA_CODE_PERIOD;
d_rem_carr_phase_rad = fmod(d_rem_carr_phase_rad, GPS_TWO_PI); d_rem_carr_phase_rad = fmod(d_rem_carr_phase_rad, GPS_TWO_PI);
// ################## DLL ########################################################## // ################## DLL ##########################################################