mirrors/gnss-sdr
1
0
Fork 0
mirror of https://github.com/gnss-sdr/gnss-sdr synced 2025-10-31 07:13:03 +00:00
Code Issues Releases Wiki Activity

Updated tracking to use cmath round which is faster than boost::math::round

Browse Source 
git-svn-id: https://svn.code.sf.net/p/gnss-sdr/code/trunk@161 64b25241-fba3-4117-9849-534c7e92360d
This commit is contained in:
Javier Arribas
2012-02-16 17:28:56 +00:00
parent b7bb79a058
commit 2406a7772a
1 changed files with 0 additions and 25 deletions
Download Patch File Download Diff File Expand all files Collapse all files

25
src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_dll_pll_tracking_cc.cc
View File

@@ -40,9 +40,6 @@
#include "tracking_discriminators.h" #include "tracking_discriminators.h"
#include "CN_estimators.h" #include "CN_estimators.h"
#include "GPS_L1_CA.h" #include "GPS_L1_CA.h"
#ifdef GNSS_SDR_USE_BOOST_ROUND
#include <boost/math/special_functions/round.hpp>
#endif
#include "control_message_factory.h" #include "control_message_factory.h"
#include <boost/lexical_cast.hpp> #include <boost/lexical_cast.hpp>
#include <iostream> #include <iostream>
@@ -209,11 +206,7 @@ void Gps_L1_Ca_Dll_Pll_Tracking_cc::start_tracking()
T_prn_mod_seconds = T_chip_mod_seconds * GPS_L1_CA_CODE_LENGTH_CHIPS; T_prn_mod_seconds = T_chip_mod_seconds * GPS_L1_CA_CODE_LENGTH_CHIPS;
T_prn_mod_samples = T_prn_mod_seconds * (float)d_fs_in; T_prn_mod_samples = T_prn_mod_seconds * (float)d_fs_in;
#ifdef GNSS_SDR_USE_BOOST_ROUND
d_next_prn_length_samples = round(T_prn_mod_samples); d_next_prn_length_samples = round(T_prn_mod_samples);
#else
d_next_prn_length_samples = std::round(T_prn_mod_samples);
#endif
float T_prn_true_seconds = GPS_L1_CA_CODE_LENGTH_CHIPS / GPS_L1_CA_CODE_RATE_HZ; float T_prn_true_seconds = GPS_L1_CA_CODE_LENGTH_CHIPS / GPS_L1_CA_CODE_RATE_HZ;
float T_prn_true_samples = T_prn_true_seconds * (float)d_fs_in; float T_prn_true_samples = T_prn_true_seconds * (float)d_fs_in;
@@ -281,7 +274,6 @@ void Gps_L1_Ca_Dll_Pll_Tracking_cc::update_local_code()
tcode_chips = -rem_code_phase_chips; tcode_chips = -rem_code_phase_chips;
for (int i=0; i<d_current_prn_length_samples; i++) for (int i=0; i<d_current_prn_length_samples; i++)
{ {
#ifdef GNSS_SDR_USE_BOOST_ROUND
associated_chip_index = 1 + round(fmod(tcode_chips - d_early_late_spc_chips, code_length_chips)); associated_chip_index = 1 + round(fmod(tcode_chips - d_early_late_spc_chips, code_length_chips));
d_early_code[i] = d_ca_code[associated_chip_index]; d_early_code[i] = d_ca_code[associated_chip_index];
associated_chip_index = 1 + round(fmod(tcode_chips, code_length_chips)); associated_chip_index = 1 + round(fmod(tcode_chips, code_length_chips));
@@ -289,15 +281,6 @@ void Gps_L1_Ca_Dll_Pll_Tracking_cc::update_local_code()
associated_chip_index = 1 + round(fmod(tcode_chips+d_early_late_spc_chips, code_length_chips)); associated_chip_index = 1 + round(fmod(tcode_chips+d_early_late_spc_chips, code_length_chips));
d_late_code[i] = d_ca_code[associated_chip_index]; d_late_code[i] = d_ca_code[associated_chip_index];
tcode_chips = tcode_chips + d_code_phase_step_chips; tcode_chips = tcode_chips + d_code_phase_step_chips;
#else
associated_chip_index = 1 + std::round(fmod(tcode_chips - d_early_late_spc_chips, code_length_chips));
d_early_code[i] = d_ca_code[associated_chip_index];
associated_chip_index = 1 + std::round(fmod(tcode_chips, code_length_chips));
d_prompt_code[i] = d_ca_code[associated_chip_index];
associated_chip_index = 1 + std::round(fmod(tcode_chips+d_early_late_spc_chips, code_length_chips));
d_late_code[i] = d_ca_code[associated_chip_index];
tcode_chips = tcode_chips + d_code_phase_step_chips;
#endif
} }
} }
@@ -372,11 +355,7 @@ int Gps_L1_Ca_Dll_Pll_Tracking_cc::general_work (int noutput_items, gr_vector_in
acq_to_trk_delay_samples = d_sample_counter - d_acq_sample_stamp; acq_to_trk_delay_samples = d_sample_counter - d_acq_sample_stamp;
acq_trk_shif_correction_samples = d_next_prn_length_samples - fmod((float)acq_to_trk_delay_samples, (float)d_next_prn_length_samples); acq_trk_shif_correction_samples = d_next_prn_length_samples - fmod((float)acq_to_trk_delay_samples, (float)d_next_prn_length_samples);
//std::cout<<"acq_trk_shif_correction="<<acq_trk_shif_correction_samples<<"\r\n"; //std::cout<<"acq_trk_shif_correction="<<acq_trk_shif_correction_samples<<"\r\n";
#ifdef GNSS_SDR_USE_BOOST_ROUND
samples_offset = round(d_acq_code_phase_samples + acq_trk_shif_correction_samples); samples_offset = round(d_acq_code_phase_samples + acq_trk_shif_correction_samples);
#else
samples_offset = std::round(d_acq_code_phase_samples + acq_trk_shif_correction_samples);
#endif
// /todo: Check if the sample counter sent to the next block as a time reference should be incremented AFTER sended or BEFORE // /todo: Check if the sample counter sent to the next block as a time reference should be incremented AFTER sended or BEFORE
d_sample_counter_seconds = d_sample_counter_seconds + (((double)samples_offset) / (double)d_fs_in); d_sample_counter_seconds = d_sample_counter_seconds + (((double)samples_offset) / (double)d_fs_in);
d_sample_counter = d_sample_counter + samples_offset; //count for the processed samples d_sample_counter = d_sample_counter + samples_offset; //count for the processed samples
@@ -473,11 +452,7 @@ int Gps_L1_Ca_Dll_Pll_Tracking_cc::general_work (int noutput_items, gr_vector_in
} }
d_code_phase_samples = fmod(d_code_phase_samples, T_prn_true_samples); d_code_phase_samples = fmod(d_code_phase_samples, T_prn_true_samples);
#ifdef GNSS_SDR_USE_BOOST_ROUND
d_next_prn_length_samples = round(K_blk_samples); //round to a discrete samples d_next_prn_length_samples = round(K_blk_samples); //round to a discrete samples
#else
d_next_prn_length_samples = std::round(K_blk_samples); //round to a discrete samples
#endif
d_next_rem_code_phase_samples = K_blk_samples - d_next_prn_length_samples; //rounding error d_next_rem_code_phase_samples = K_blk_samples - d_next_prn_length_samples; //rounding error
/*! /*!