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GPS L2C M acquisition incremental update: Added preliminarly support of

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multiple signals on the same system in GNSS-SDR architecture
This commit is contained in:
Javier
2015-04-24 19:11:45 +02:00
parent 75983a0471
commit 12b5d798a7
9 changed files with 561 additions and 44 deletions
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1
src/algorithms/libs/CMakeLists.txt
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@@ -18,6 +18,7 @@
set(GNSS_SPLIBS_SOURCES
gps_l2c_signal.cc
galileo_e1_signal_processing.cc
gnss_sdr_valve.cc
gnss_signal_processing.cc

25
src/algorithms/libs/gps_l2c_signal.cc
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@@ -36,16 +36,15 @@
#include <cmath>
int8_t gps_l2c_m_shift(int x)
int32_t gps_l2c_m_shift(int32_t x)
{
int8_t a;
return (int8_t)((x>>1)^(x&1)*0445112474);
return (int32_t)((x>>1)^((x&1)*0445112474));
}
void gps_l2c_m_code(int8_t * _dest, int _prn)
void gps_l2c_m_code(int32_t * _dest, unsigned int _prn)
{
int x;
x= GPS_L2C_M_INIT_REG[_prn];
int32_t x;
x= GPS_L2C_M_INIT_REG[_prn-1];
for (int n=0; n<GPS_L2_M_CODE_LENGTH_CHIPS; n++)
{
x= gps_l2c_m_shift(x);
@@ -54,12 +53,16 @@ void gps_l2c_m_code(int8_t * _dest, int _prn)
}
/*
* Generates complex GPS L1 C/A code for the desired SV ID and sampled to specific sampling frequency
* Generates complex GPS L2C M code for the desired SV ID and sampled to specific sampling frequency
*/
void gps_l1_ca_code_gen_complex_sampled(std::complex<float>* _dest, unsigned int _prn, signed int _fs)
void gps_l2c_m_code_gen_complex_sampled(std::complex<float>* _dest, unsigned int _prn, signed int _fs)
{
int8_t _code[GPS_L2_M_CODE_LENGTH_CHIPS];
int32_t _code[GPS_L2_M_CODE_LENGTH_CHIPS];
if (_prn<51)
{
gps_l2c_m_code(_code, _prn);
}
signed int _samplesPerCode, _codeValueIndex;
float _ts;
@@ -92,12 +95,12 @@ void gps_l1_ca_code_gen_complex_sampled(std::complex<float>* _dest, unsigned int
if (i == _samplesPerCode - 1)
{
//--- Correct the last index (due to number rounding issues) -----------
_dest[i] = std::complex(1.0-2.0*_code[_codeLength - 1],0);
_dest[i] = std::complex<float>(1.0-2.0*_code[_codeLength - 1],0);
}
else
{
_dest[i] = std::complex(1.0-2.0*_code[_codeValueIndex],0);; //repeat the chip -> upsample
_dest[i] = std::complex<float>(1.0-2.0*_code[_codeValueIndex],0);; //repeat the chip -> upsample
}
}
}

8
src/algorithms/libs/gps_l2c_signal.h
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@@ -37,13 +37,7 @@
#include <iostream>
#include "GPS_L2C.h"
//!Generates complex GPS L2C M code for the desired SV ID and code shift, and sampled to specific sampling frequency
void gps_l2_m_code_gen_complex(std::complex<float>* _dest, signed int _prn, unsigned int _chip_shift);
//! Generates N complex GPS L2C M codes for the desired SV ID and code shift
void gps_l2_m_code_gen_complex_sampled(std::complex<float>* _dest, unsigned int _prn, signed int _fs, unsigned int _chip_shift, unsigned int _ncodes);
//! Generates complex GPS L2C M code for the desired SV ID and code shift
void gps_l2_m_code_gen_complex_sampled(std::complex<float>* _dest, unsigned int _prn, signed int _fs, unsigned int _chip_shift);
void gps_l2c_m_code_gen_complex_sampled(std::complex<float>* _dest, unsigned int _prn, signed int _fs);
#endif /* GNSS_GPS_L2C_SIGNAL_H_ */