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Merge branch 'galileo_e5a' of https://github.com/marc-sales/gnss-sdr

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Conflicts:
	src/core/receiver/gnss_block_factory.cc
	src/core/receiver/gnss_flowgraph.cc
This commit is contained in:
Carles Fernandez
2014-09-05 18:51:08 +02:00
parent 597bb9c035 91964ffbf3
commit dfd9be34a9
53 changed files with 7978 additions and 241 deletions
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2
src/algorithms/libs/CMakeLists.txt
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@@ -27,6 +27,7 @@ if(OPENCL_FOUND)
fft_execute.cc # Needs OpenCL
fft_setup.cc # Needs OpenCL
fft_kernelstring.cc # Needs OpenCL
galileo_e5_signal_processing.cc
)
else(OPENCL_FOUND)
set(GNSS_SPLIBS_SOURCES
@@ -36,6 +37,7 @@ else(OPENCL_FOUND)
gps_sdr_signal_processing.cc
nco_lib.cc
pass_through.cc
galileo_e5_signal_processing.cc
)
endif(OPENCL_FOUND)

145
src/algorithms/libs/galileo_e5_signal_processing.cc Normal file
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@@ -0,0 +1,145 @@
/*!
* \file galileo_e5_signal_processing.cc
* \brief This library implements various functions for Galileo E5 signals such
* as replica code generation
* \author Marc Sales, 2014. marcsales92(at)gmail.com
*
* Detailed description of the file here if needed.
*
* -------------------------------------------------------------------------
*
* Copyright (C) 2010-2014 (see AUTHORS file for a list of contributors)
*
* GNSS-SDR is a software defined Global Navigation
* Satellite Systems receiver
*
* This file is part of GNSS-SDR.
*
* GNSS-SDR is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* at your option) any later version.
*
* GNSS-SDR is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNSS-SDR. If not, see <http://www.gnu.org/licenses/>.
*
* -------------------------------------------------------------------------
*/
#include "galileo_e5_signal_processing.h"
void galileo_e5_a_code_gen_complex_primary(std::complex<float>* _dest, signed int _prn, char _Signal[3])
{
unsigned int prn=_prn-1;
unsigned int index=0;
int a[4];
if ((_prn < 1) || (_prn > 50))
{
return;
}
if (_Signal[0]=='5' && _Signal[1]=='Q')
{
for (size_t i = 0; i < Galileo_E5a_Q_PRIMARY_CODE[prn].length()-1; i++)
{
hex_to_binary_converter(a,
Galileo_E5a_Q_PRIMARY_CODE[prn].at(i));
_dest[index]=std::complex<float>(0.0,float(a[0]));
_dest[index+1]=std::complex<float>(0.0,float(a[1]));
_dest[index+2]=std::complex<float>(0.0,float(a[2]));
_dest[index+3]=std::complex<float>(0.0,float(a[3]));
index = index + 4;
}
// last 2 bits are filled up zeros
hex_to_binary_converter(a,
Galileo_E5a_Q_PRIMARY_CODE[prn].at(Galileo_E5a_Q_PRIMARY_CODE[prn].length()-1));
_dest[index]=std::complex<float>(float(0.0),a[0]);
_dest[index+1]=std::complex<float>(float(0.0),a[1]);
}
else if (_Signal[0]=='5' && _Signal[1]=='I')
{
for (size_t i = 0; i < Galileo_E5a_I_PRIMARY_CODE[prn].length()-1; i++)
{
hex_to_binary_converter(a,
Galileo_E5a_I_PRIMARY_CODE[prn].at(i));
_dest[index]=std::complex<float>(float(a[0]),0.0);
_dest[index+1]=std::complex<float>(float(a[1]),0.0);
_dest[index+2]=std::complex<float>(float(a[2]),0.0);
_dest[index+3]=std::complex<float>(float(a[3]),0.0);
index = index + 4;
}
// last 2 bits are filled up zeros
hex_to_binary_converter(a,
Galileo_E5a_I_PRIMARY_CODE[prn].at(Galileo_E5a_I_PRIMARY_CODE[prn].length()-1));
_dest[index]=std::complex<float>(float(a[0]),0.0);
_dest[index+1]=std::complex<float>(float(a[1]),0.0);
}
else if (_Signal[0]=='5' && _Signal[1]=='X')
{
int b[4];
for (size_t i = 0; i < Galileo_E5a_I_PRIMARY_CODE[prn].length()-1; i++)
{
hex_to_binary_converter(a,
Galileo_E5a_I_PRIMARY_CODE[prn].at(i));
hex_to_binary_converter(b,
Galileo_E5a_Q_PRIMARY_CODE[prn].at(i));
_dest[index]=std::complex<float>(float(a[0]),float(b[0]));
_dest[index+1]=std::complex<float>(float(a[1]),float(b[1]));
_dest[index+2]=std::complex<float>(float(a[2]),float(b[2]));
_dest[index+3]=std::complex<float>(float(a[3]),float(b[3]));
index = index + 4;
}
// last 2 bits are filled up zeros
hex_to_binary_converter(a,
Galileo_E5a_I_PRIMARY_CODE[prn].at(Galileo_E5a_I_PRIMARY_CODE[prn].length()-1));
hex_to_binary_converter(b,
Galileo_E5a_Q_PRIMARY_CODE[prn].at(Galileo_E5a_Q_PRIMARY_CODE[prn].length()-1));
_dest[index]=std::complex<float>(float(a[0]),float(b[0]));
_dest[index+1]=std::complex<float>(float(a[1]),float(b[1]));
}
}
void galileo_e5_a_code_gen_complex_sampled(std::complex<float>* _dest, char _Signal[3],
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
unsigned int _samplesPerCode;
unsigned int delay;
unsigned int _codeLength = Galileo_E5a_CODE_LENGTH_CHIPS;
const int _codeFreqBasis = Galileo_E5a_CODE_CHIP_RATE_HZ; //Hz
std::complex<float>* _code;
_code=new std::complex<float>[_codeLength];
galileo_e5_a_code_gen_complex_primary(_code , _prn , _Signal);
_samplesPerCode = round(_fs / (_codeFreqBasis / _codeLength));
delay = ((_codeLength - _chip_shift)
% _codeLength) * _samplesPerCode / _codeLength;
if (_fs != _codeFreqBasis)
{
std::complex<float>* _resampled_signal;
if (posix_memalign((void**)&_resampled_signal, 16, _samplesPerCode * sizeof(gr_complex)) == 0){};
resampler(_code, _resampled_signal, _codeFreqBasis, _fs,
_codeLength, _samplesPerCode); //resamples code to fs
delete[] _code;
_code = _resampled_signal;
}
for (unsigned int i = 0; i < _samplesPerCode; i++)
{
_dest[(i+delay)%_samplesPerCode] = _code[i];
}
free(_code);
}

60
src/algorithms/libs/galileo_e5_signal_processing.h Normal file
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@@ -0,0 +1,60 @@
/*!
* \file galileo_e5_signal_processing.cc
* \brief This library implements various functions for Galileo E5 signals such
* as replica code generation
* \author Marc Sales, 2014. marcsales92(at)gmail.com
*
* Detailed description of the file here if needed.
*
* -------------------------------------------------------------------------
*
* Copyright (C) 2010-2014 (see AUTHORS file for a list of contributors)
*
* GNSS-SDR is a software defined Global Navigation
* Satellite Systems receiver
*
* This file is part of GNSS-SDR.
*
* GNSS-SDR is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* at your option) any later version.
*
* GNSS-SDR is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNSS-SDR. If not, see <http://www.gnu.org/licenses/>.
*
* -------------------------------------------------------------------------
*/
#ifndef GNSS_SDR_GALILEO_E5_SIGNAL_PROCESSING_H_
#define GNSS_SDR_GALILEO_E5_SIGNAL_PROCESSING_H_
#include <complex>
#include <iostream>
#include <gnuradio/math.h>
#include "Galileo_E5a.h"
#include "gnss_signal_processing.h"
/*!
* \brief Generates Galileo E5a code at 1 sample/chip
* bool _pilot generates E5aQ code if true and E5aI (data signal) if false.
*/
void galileo_e5_a_code_gen_complex_primary(std::complex<float>* _dest, signed int _prn, char _Signal[3]);
void galileo_e5_a_code_gen_tiered(std::complex<float>* _dest,std::complex<float>* _primary ,unsigned int _prn, char _Signal[3]);
/*!
* \brief Generates Galileo E5a complex code, shifted to the desired chip and sampled at a frequency fs
* bool _pilot generates E5aQ code if true and E5aI (data signal) if false.
*/
void galileo_e5_a_code_gen_complex_sampled(std::complex<float>* _dest,
char _Signal[3], unsigned int _prn, signed int _fs, unsigned int _chip_shift);
#endif /* GNSS_SDR_GALILEO_E5_SIGNAL_PROCESSING_H_ */

16
src/algorithms/libs/gnss_signal_processing.cc
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@@ -180,20 +180,14 @@ void resampler(std::complex<float>* _from, std::complex<float>* _dest, float _fs
//--- Find time constants --------------------------------------------------
const float _t_in = 1/_fs_in; // Incoming sampling period in sec
const float _t_out = 1/_fs_out; // Out sampling period in sec
for (unsigned int i=0; i<_length_out; i++)
for (unsigned int i=0; i<_length_out-1; i++)
{
//=== Digitizing =======================================================
//--- compute index array to read sampled values -------------------------
_codeValueIndex = ceil((_t_out * ((float)i + 1)) / _t_in) - 1;
if (i == _length_out - 1)
{
//--- Correct the last index (due to number rounding issues) -----------
_dest[i] = _from[_length_in - 1];
}
else
{
//if repeat the chip -> upsample by nearest neighborhood interpolation
_dest[i] = _from[_codeValueIndex];
}
//if repeat the chip -> upsample by nearest neighborhood interpolation
_dest[i] = _from[_codeValueIndex];
}
//--- Correct the last index (due to number rounding issues) -----------
_dest[_length_out-1] = _from[_length_in - 1];
}