[hamradio-commits] [gnss-sdr] 14/251: faster update

[Carles Fernandez]

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

commit 09e86c275095ae61edc371108a0360fceddc7051
Author: Carles Fernandez <carles.fernandez at gmail.com>
Date:   Sun May 3 12:33:51 2015 +0200

    faster update
---
 .../gnuradio_blocks/gps_l1_ca_dll_pll_tracking_cc.cc         | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

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 c78e6da..97c9222 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
@@ -281,14 +281,16 @@ void Gps_L1_Ca_Dll_Pll_Tracking_cc::update_local_code()
 
 void Gps_L1_Ca_Dll_Pll_Tracking_cc::update_local_carrier()
 {
-    float phase_rad, phase_step_rad;
+    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);
+    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);
 
-    phase_step_rad = static_cast<float>(GPS_TWO_PI) * d_carrier_doppler_hz / static_cast<float>(d_fs_in);
-    phase_rad = d_rem_carr_phase_rad;
     for(int i = 0; i < d_current_prn_length_samples; i++)
         {
-            d_carr_sign[i] = gr_complex(cos(phase_rad), -sin(phase_rad));
-            phase_rad += phase_step_rad;
+            gr::fxpt::sincos(phase_rad_i, &sin_f, &cos_f);
+            d_carr_sign[i] = std::complex<float>(cos_f, -sin_f);
+            phase_rad_i += phase_step_rad_i;
         }
     //d_rem_carr_phase_rad = fmod(phase_rad, GPS_TWO_PI);
     //d_acc_carrier_phase_rad = d_acc_carrier_phase_rad + d_rem_carr_phase_rad;

-- 
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