[hamradio-commits] [gnss-sdr] 66/126: Added IF handling to acq and tracking

[Carles Fernandez]

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carles_fernandez-guest pushed a commit to branch next
in repository gnss-sdr.

commit 518deb501a1a23e5ccbcdf65583dd45f21e3c6eb
Author: Cillian O'Driscoll <cillian.odriscoll at gmail.com>
Date:   Thu Nov 26 13:33:13 2015 +0000

    Added IF handling to acq and tracking
    
    Only GPS L1 CA DLL PLL tracking for now. Still experimental.
---
 .../acquisition/gnuradio_blocks/pcps_acquisition_fine_doppler_cc.cc   | 2 +-
 .../tracking/gnuradio_blocks/gps_l1_ca_dll_pll_tracking_cc.cc         | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/algorithms/acquisition/gnuradio_blocks/pcps_acquisition_fine_doppler_cc.cc b/src/algorithms/acquisition/gnuradio_blocks/pcps_acquisition_fine_doppler_cc.cc
index 0d4743e..a0fed41 100644
--- a/src/algorithms/acquisition/gnuradio_blocks/pcps_acquisition_fine_doppler_cc.cc
+++ b/src/algorithms/acquisition/gnuradio_blocks/pcps_acquisition_fine_doppler_cc.cc
@@ -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 search steps
             // 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];
             fxp_nco(d_grid_doppler_wipeoffs[doppler_index], d_fft_size,0, phase_step_rad);
         }
diff --git a/src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_dll_pll_tracking_cc.cc b/src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_dll_pll_tracking_cc.cc
index 3193d33..5027cbf 100644
--- a/src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_dll_pll_tracking_cc.cc
+++ b/src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_dll_pll_tracking_cc.cc
@@ -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()
 {
     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_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
             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
-            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);
 
             // ################## DLL ##########################################################

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