mirror of https://github.com/gnss-sdr/gnss-sdr
278 lines
12 KiB
C++
278 lines
12 KiB
C++
/*!
|
|
* \file galileo_e1_signal_processing.cc
|
|
* \brief This library implements various functions for Galileo E1 signals
|
|
* \author Luis Esteve, 2012. luis(at)epsilon-formacion.com
|
|
*
|
|
* Detailed description of the file here if needed.
|
|
*
|
|
* -------------------------------------------------------------------------
|
|
*
|
|
* Copyright (C) 2010-2018 (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 <https://www.gnu.org/licenses/>.
|
|
*
|
|
* -------------------------------------------------------------------------
|
|
*/
|
|
|
|
#include "galileo_e1_signal_processing.h"
|
|
#include "Galileo_E1.h"
|
|
#include "gnss_signal_processing.h"
|
|
#include <volk_gnsssdr/volk_gnsssdr.h>
|
|
#include <memory>
|
|
#include <string>
|
|
|
|
|
|
void galileo_e1_code_gen_int(gsl::span<int> _dest, const std::array<char, 3>& _Signal, int32_t _prn)
|
|
{
|
|
std::string _galileo_signal = _Signal.data();
|
|
int32_t prn = _prn - 1;
|
|
int32_t index = 0;
|
|
|
|
// A simple error check
|
|
if ((_prn < 1) || (_prn > 50))
|
|
{
|
|
return;
|
|
}
|
|
|
|
if (_galileo_signal.rfind("1B") != std::string::npos && _galileo_signal.length() >= 2)
|
|
{
|
|
for (char i : GALILEO_E1_B_PRIMARY_CODE[prn])
|
|
{
|
|
hex_to_binary_converter(_dest.subspan(index, 4), i);
|
|
index += 4;
|
|
}
|
|
}
|
|
else if (_galileo_signal.rfind("1C") != std::string::npos && _galileo_signal.length() >= 2)
|
|
{
|
|
for (char i : GALILEO_E1_C_PRIMARY_CODE[prn])
|
|
{
|
|
hex_to_binary_converter(_dest.subspan(index, 4), i);
|
|
index += 4;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void galileo_e1_sinboc_11_gen_int(gsl::span<int> _dest, gsl::span<const int> _prn)
|
|
{
|
|
const uint32_t _length_in = GALILEO_E1_B_CODE_LENGTH_CHIPS;
|
|
auto _period = static_cast<uint32_t>(_dest.size() / _length_in);
|
|
for (uint32_t i = 0; i < _length_in; i++)
|
|
{
|
|
for (uint32_t j = 0; j < (_period / 2); j++)
|
|
{
|
|
_dest[i * _period + j] = _prn[i];
|
|
}
|
|
for (uint32_t j = (_period / 2); j < _period; j++)
|
|
{
|
|
_dest[i * _period + j] = -_prn[i];
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void galileo_e1_sinboc_61_gen_int(gsl::span<int> _dest, gsl::span<const int> _prn)
|
|
{
|
|
const uint32_t _length_in = GALILEO_E1_B_CODE_LENGTH_CHIPS;
|
|
auto _period = static_cast<uint32_t>(_dest.size() / _length_in);
|
|
|
|
for (uint32_t i = 0; i < _length_in; i++)
|
|
{
|
|
for (uint32_t j = 0; j < _period; j += 2)
|
|
{
|
|
_dest[i * _period + j] = _prn[i];
|
|
}
|
|
for (uint32_t j = 1; j < _period; j += 2)
|
|
{
|
|
_dest[i * _period + j] = -_prn[i];
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void galileo_e1_code_gen_sinboc11_float(gsl::span<float> _dest, const std::array<char, 3>& _Signal, uint32_t _prn)
|
|
{
|
|
std::string _galileo_signal = _Signal.data();
|
|
const auto _codeLength = static_cast<uint32_t>(GALILEO_E1_B_CODE_LENGTH_CHIPS);
|
|
int32_t primary_code_E1_chips[4092]; // _codeLength not accepted by Clang
|
|
galileo_e1_code_gen_int(primary_code_E1_chips, _Signal, _prn); //generate Galileo E1 code, 1 sample per chip
|
|
for (uint32_t i = 0; i < _codeLength; i++)
|
|
{
|
|
_dest[2 * i] = static_cast<float>(primary_code_E1_chips[i]);
|
|
_dest[2 * i + 1] = -_dest[2 * i];
|
|
}
|
|
}
|
|
|
|
|
|
void galileo_e1_gen_float(gsl::span<float> _dest, gsl::span<int> _prn, const std::array<char, 3>& _Signal)
|
|
{
|
|
std::string _galileo_signal = _Signal.data();
|
|
const uint32_t _codeLength = 12 * GALILEO_E1_B_CODE_LENGTH_CHIPS;
|
|
const float alpha = sqrt(10.0 / 11.0);
|
|
const float beta = sqrt(1.0 / 11.0);
|
|
|
|
int32_t sinboc_11[12 * 4092] = {0}; // _codeLength not accepted by Clang
|
|
int32_t sinboc_61[12 * 4092] = {0};
|
|
gsl::span<int32_t> sinboc_11_(sinboc_11, _codeLength);
|
|
gsl::span<int32_t> sinboc_61_(sinboc_61, _codeLength);
|
|
|
|
galileo_e1_sinboc_11_gen_int(sinboc_11_, _prn); //generate sinboc(1,1) 12 samples per chip
|
|
galileo_e1_sinboc_61_gen_int(sinboc_61_, _prn); //generate sinboc(6,1) 12 samples per chip
|
|
|
|
if (_galileo_signal.rfind("1B") != std::string::npos && _galileo_signal.length() >= 2)
|
|
{
|
|
for (uint32_t i = 0; i < _codeLength; i++)
|
|
{
|
|
_dest[i] = alpha * static_cast<float>(sinboc_11[i]) +
|
|
beta * static_cast<float>(sinboc_61[i]);
|
|
}
|
|
}
|
|
else if (_galileo_signal.rfind("1C") != std::string::npos && _galileo_signal.length() >= 2)
|
|
{
|
|
for (uint32_t i = 0; i < _codeLength; i++)
|
|
{
|
|
_dest[i] = alpha * static_cast<float>(sinboc_11[i]) -
|
|
beta * static_cast<float>(sinboc_61[i]);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void galileo_e1_code_gen_float_sampled(gsl::span<float> _dest, const std::array<char, 3>& _Signal,
|
|
bool _cboc, uint32_t _prn, int32_t _fs, uint32_t _chip_shift,
|
|
bool _secondary_flag)
|
|
{
|
|
// This function is based on the GNU software GPS for MATLAB in Kay Borre's book
|
|
std::string _galileo_signal = _Signal.data();
|
|
uint32_t _samplesPerCode;
|
|
const int32_t _codeFreqBasis = GALILEO_E1_CODE_CHIP_RATE_HZ; // Hz
|
|
auto _codeLength = static_cast<uint32_t>(GALILEO_E1_B_CODE_LENGTH_CHIPS);
|
|
auto* primary_code_E1_chips = static_cast<int32_t*>(volk_gnsssdr_malloc(static_cast<uint32_t>(GALILEO_E1_B_CODE_LENGTH_CHIPS) * sizeof(int32_t), volk_gnsssdr_get_alignment()));
|
|
|
|
_samplesPerCode = static_cast<uint32_t>(static_cast<double>(_fs) / (static_cast<double>(_codeFreqBasis) / static_cast<double>(_codeLength)));
|
|
const int32_t _samplesPerChip = (_cboc == true) ? 12 : 2;
|
|
|
|
const uint32_t delay = ((static_cast<int32_t>(GALILEO_E1_B_CODE_LENGTH_CHIPS) - _chip_shift) % static_cast<int32_t>(GALILEO_E1_B_CODE_LENGTH_CHIPS)) * _samplesPerCode / GALILEO_E1_B_CODE_LENGTH_CHIPS;
|
|
|
|
galileo_e1_code_gen_int(gsl::span<int32_t>(primary_code_E1_chips, static_cast<uint32_t>(GALILEO_E1_B_CODE_LENGTH_CHIPS)), _Signal, _prn); // generate Galileo E1 code, 1 sample per chip
|
|
|
|
_codeLength = _samplesPerChip * GALILEO_E1_B_CODE_LENGTH_CHIPS;
|
|
std::unique_ptr<float> _signal_E1{new float[_codeLength]};
|
|
gsl::span<float> _signal_E1_span(_signal_E1, _codeLength);
|
|
|
|
if (_cboc == true)
|
|
{
|
|
galileo_e1_gen_float(_signal_E1_span, gsl::span<int>(primary_code_E1_chips, static_cast<uint32_t>(GALILEO_E1_B_CODE_LENGTH_CHIPS)), _Signal); // generate cboc 12 samples per chip
|
|
}
|
|
else
|
|
{
|
|
auto* _signal_E1_int = static_cast<int32_t*>(volk_gnsssdr_malloc(_codeLength * sizeof(int32_t), volk_gnsssdr_get_alignment()));
|
|
gsl::span<int32_t> _signal_E1_int_span(_signal_E1_int, _codeLength);
|
|
galileo_e1_sinboc_11_gen_int(_signal_E1_int_span, gsl::span<int>(primary_code_E1_chips, static_cast<uint32_t>(GALILEO_E1_B_CODE_LENGTH_CHIPS))); // generate sinboc(1,1) 2 samples per chip
|
|
|
|
for (uint32_t ii = 0; ii < _codeLength; ++ii)
|
|
{
|
|
_signal_E1_span[ii] = static_cast<float>(_signal_E1_int_span[ii]);
|
|
}
|
|
volk_gnsssdr_free(_signal_E1_int);
|
|
}
|
|
|
|
if (_fs != _samplesPerChip * _codeFreqBasis)
|
|
{
|
|
std::unique_ptr<float> _resampled_signal{new float[_samplesPerCode]};
|
|
|
|
resampler(gsl::span<float>(_signal_E1, _codeLength), gsl::span<float>(_resampled_signal, _samplesPerCode), _samplesPerChip * _codeFreqBasis, _fs); // resamples code to fs
|
|
|
|
_signal_E1 = std::move(_resampled_signal);
|
|
}
|
|
uint32_t size_signal_E1 = _codeLength;
|
|
if (_fs != _samplesPerChip * _codeFreqBasis)
|
|
{
|
|
size_signal_E1 = _samplesPerCode;
|
|
}
|
|
gsl::span<float> _signal_E1_span_aux(_signal_E1, size_signal_E1);
|
|
if (_galileo_signal.rfind("1C") != std::string::npos && _galileo_signal.length() >= 2 && _secondary_flag)
|
|
{
|
|
std::unique_ptr<float> _signal_E1C_secondary{new float[static_cast<int32_t>(GALILEO_E1_C_SECONDARY_CODE_LENGTH) * _samplesPerCode]};
|
|
gsl::span<float> _signal_E1C_secondary_span(_signal_E1C_secondary, static_cast<int32_t>(GALILEO_E1_C_SECONDARY_CODE_LENGTH) * _samplesPerCode);
|
|
for (uint32_t i = 0; i < static_cast<uint32_t>(GALILEO_E1_C_SECONDARY_CODE_LENGTH); i++)
|
|
{
|
|
for (unsigned k = 0; k < _samplesPerCode; k++)
|
|
{
|
|
_signal_E1C_secondary_span[i * _samplesPerCode + k] = _signal_E1_span_aux[k] * (GALILEO_E1_C_SECONDARY_CODE.at(i) == '0' ? 1.0F : -1.0F);
|
|
}
|
|
}
|
|
|
|
_samplesPerCode *= static_cast<int32_t>(GALILEO_E1_C_SECONDARY_CODE_LENGTH);
|
|
|
|
_signal_E1 = std::move(_signal_E1C_secondary);
|
|
}
|
|
if (_galileo_signal.rfind("1C") != std::string::npos && _galileo_signal.length() >= 2 && _secondary_flag)
|
|
{
|
|
size_signal_E1 = static_cast<int32_t>(GALILEO_E1_C_SECONDARY_CODE_LENGTH) * _samplesPerCode;
|
|
}
|
|
gsl::span<float> _signal_E1_span_aux2(_signal_E1, size_signal_E1);
|
|
for (uint32_t i = 0; i < _samplesPerCode; i++)
|
|
{
|
|
_dest[(i + delay) % _samplesPerCode] = _signal_E1_span_aux2[i];
|
|
}
|
|
|
|
volk_gnsssdr_free(primary_code_E1_chips);
|
|
}
|
|
|
|
|
|
void galileo_e1_code_gen_complex_sampled(gsl::span<std::complex<float>> _dest, const std::array<char, 3>& _Signal,
|
|
bool _cboc, uint32_t _prn, int32_t _fs, uint32_t _chip_shift,
|
|
bool _secondary_flag)
|
|
{
|
|
std::string _galileo_signal = _Signal.data();
|
|
const int32_t _codeFreqBasis = GALILEO_E1_CODE_CHIP_RATE_HZ; // Hz
|
|
auto _samplesPerCode = static_cast<uint32_t>(static_cast<double>(_fs) /
|
|
(static_cast<double>(_codeFreqBasis) / static_cast<double>(GALILEO_E1_B_CODE_LENGTH_CHIPS)));
|
|
|
|
if (_galileo_signal.rfind("1C") != std::string::npos && _galileo_signal.length() >= 2 && _secondary_flag)
|
|
{
|
|
_samplesPerCode *= static_cast<int32_t>(GALILEO_E1_C_SECONDARY_CODE_LENGTH);
|
|
}
|
|
|
|
auto* real_code = static_cast<float*>(volk_gnsssdr_malloc(_samplesPerCode * sizeof(float), volk_gnsssdr_get_alignment()));
|
|
gsl::span<float> real_code_span(real_code, _samplesPerCode);
|
|
galileo_e1_code_gen_float_sampled(real_code_span, _Signal, _cboc, _prn, _fs, _chip_shift, _secondary_flag);
|
|
|
|
for (uint32_t ii = 0; ii < _samplesPerCode; ++ii)
|
|
{
|
|
_dest[ii] = std::complex<float>(real_code_span[ii], 0.0F);
|
|
}
|
|
volk_gnsssdr_free(real_code);
|
|
}
|
|
|
|
|
|
void galileo_e1_code_gen_float_sampled(gsl::span<float> _dest, const std::array<char, 3>& _Signal,
|
|
bool _cboc, uint32_t _prn, int32_t _fs, uint32_t _chip_shift)
|
|
{
|
|
galileo_e1_code_gen_float_sampled(_dest, _Signal, _cboc, _prn, _fs, _chip_shift, false);
|
|
}
|
|
|
|
|
|
void galileo_e1_code_gen_complex_sampled(gsl::span<std::complex<float>> _dest, const std::array<char, 3>& _Signal,
|
|
bool _cboc, uint32_t _prn, int32_t _fs, uint32_t _chip_shift)
|
|
{
|
|
galileo_e1_code_gen_complex_sampled(_dest, _Signal, _cboc, _prn, _fs, _chip_shift, false);
|
|
}
|