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Add chip shift to glonass ca code

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Gastd
2017-06-01 20:49:44 -03:00
parent 74b481e69d
commit e4ded155ca
2 changed files with 8 additions and 6 deletions
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8
src/algorithms/libs/glonass_l1_signal_processing.cc
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@@ -34,7 +34,7 @@
auto auxCeil = [](float x){ return static_cast<int>(static_cast<long>((x)+1)); }; auto auxCeil = [](float x){ return static_cast<int>(static_cast<long>((x)+1)); };
void glonass_l1_ca_code_gen_complex(std::complex<float>* _dest/*, signed int _prn, unsigned int _chip_shift*/) void glonass_l1_ca_code_gen_complex(std::complex<float>* _dest,/* signed int _prn,*/ unsigned int _chip_shift)
{ {
const unsigned int _code_length = 511; const unsigned int _code_length = 511;
bool G1[_code_length]; bool G1[_code_length];
@@ -76,13 +76,15 @@ void glonass_l1_ca_code_gen_complex(std::complex<float>* _dest/*, signed int _pr
_dest[lcv] = std::complex<float>(-1, 0); _dest[lcv] = std::complex<float>(-1, 0);
} }
} }
/* TODO: Implement the chip shifting*/
} }
/* /*
* Generates complex GLONASS L1 C/A code for the desired SV ID and sampled to specific sampling frequency * Generates complex GLONASS L1 C/A code for the desired SV ID and sampled to specific sampling frequency
*/ */
void glonass_l1_ca_code_gen_complex_sampled(std::complex<float>* _dest, unsigned int _prn, signed int _fs, unsigned int _chip_shift) void glonass_l1_ca_code_gen_complex_sampled(std::complex<float>* _dest,/* unsigned int _prn,*/ signed int _fs, unsigned int _chip_shift)
{ {
// This function is based on the GNU software GPS for MATLAB in the Kay Borre book // This function is based on the GNU software GPS for MATLAB in the Kay Borre book
std::complex<float> _code[511]; std::complex<float> _code[511];
@@ -99,7 +101,7 @@ void glonass_l1_ca_code_gen_complex_sampled(std::complex<float>* _dest, unsigned
//--- Find time constants -------------------------------------------------- //--- Find time constants --------------------------------------------------
_ts = 1.0 / static_cast<float>(_fs); // Sampling period in sec _ts = 1.0 / static_cast<float>(_fs); // Sampling period in sec
_tc = 1.0 / static_cast<float>(_codeFreqBasis); // C/A chip period in sec _tc = 1.0 / static_cast<float>(_codeFreqBasis); // C/A chip period in sec
glonass_l1_ca_code_gen_complex(_code); //generate C/A code 1 sample per chip glonass_l1_ca_code_gen_complex(_code, _chip_shift); //generate C/A code 1 sample per chip
for (signed int i = 0; i < _samplesPerCode; i++) for (signed int i = 0; i < _samplesPerCode; i++)
{ {

6
src/algorithms/libs/glonass_l1_signal_processing.h
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@@ -36,12 +36,12 @@
#include <complex> #include <complex>
//!Generates complex GLONASS L1 C/A code for the desired SV ID and code shift, and sampled to specific sampling frequency //!Generates complex GLONASS L1 C/A code for the desired SV ID and code shift, and sampled to specific sampling frequency
void glonass_l1_ca_code_gen_complex(std::complex<float>* _dest/*, signed int _prn, unsigned int _chip_shift*/); void glonass_l1_ca_code_gen_complex(std::complex<float>* _dest, /*signed int _prn,*/ unsigned int _chip_shift);
//! Generates N complex GLONASS L1 C/A codes for the desired SV ID and code shift //! Generates N complex GLONASS L1 C/A codes for the desired SV ID and code shift
void glonass_l1_ca_code_gen_complex_sampled(std::complex<float>* _dest, unsigned int _prn, signed int _fs, unsigned int _chip_shift, unsigned int _ncodes); void glonass_l1_ca_code_gen_complex_sampled(std::complex<float>* _dest,/* unsigned int _prn,*/ signed int _fs, unsigned int _chip_shift, unsigned int _ncodes);
//! Generates complex GLONASS L1 C/A code for the desired SV ID and code shift //! Generates complex GLONASS L1 C/A code for the desired SV ID and code shift
void glonass_l1_ca_code_gen_complex_sampled(std::complex<float>* _dest, unsigned int _prn, signed int _fs, unsigned int _chip_shift); void glonass_l1_ca_code_gen_complex_sampled(std::complex<float>* _dest,/* unsigned int _prn,*/ signed int _fs, unsigned int _chip_shift);
#endif /* GNSS_SDR_GPS_SDR_SIGNAL_PROCESSING_H_ */ #endif /* GNSS_SDR_GPS_SDR_SIGNAL_PROCESSING_H_ */