mirror of
https://github.com/gnss-sdr/gnss-sdr
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119 lines
4.6 KiB
C++
119 lines
4.6 KiB
C++
/*!
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* \file galileo_e1_signal_processing.cc
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* \brief This library implements various functions for Galileo E5 signals such
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* as replica code generation
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* \author Marc Sales, 2014. marcsales92(at)gmail.com
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*
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* Detailed description of the file here if needed.
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*
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* -------------------------------------------------------------------------
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*
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* Copyright (C) 2010-2014 (see AUTHORS file for a list of contributors)
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*
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* GNSS-SDR is a software defined Global Navigation
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* Satellite Systems receiver
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*
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* This file is part of GNSS-SDR.
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*
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* GNSS-SDR is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* at your option) any later version.
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*
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* GNSS-SDR is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNSS-SDR. If not, see <http://www.gnu.org/licenses/>.
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*
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* -------------------------------------------------------------------------
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*/
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#include "galileo_e5_signal_processing.h"
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void galileo_e5_a_code_gen_complex(std::complex<float>* _dest, signed int _prn, bool _pilot)
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{
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unsigned int prn=_prn-1;
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unsigned int index=0;
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//int _code_int[(int)Galileo_E5a_CODE_LENGTH_CHIPS];
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int a[4];
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if ((_prn < 1) || (_prn > 50))
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{
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return;
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}
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if (_pilot)
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{
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for (size_t i = 0; i < Galileo_E5a_Q_PRIMARY_CODE[prn].length(); i++)
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{
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// hex_to_binary_converter(&_dest[index],
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// Galileo_E5a_Q_PRIMARY_CODE[prn].at(i));
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// hex_to_binary_converter(&_code_int[index],
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// Galileo_E5a_Q_PRIMARY_CODE[prn].at(i));
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hex_to_binary_converter(&a[0],
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Galileo_E5a_Q_PRIMARY_CODE[prn].at(i));
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_dest[index]=std::complex<float>(float(a[0]),0.0);
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_dest[index+1]=std::complex<float>(float(a[1]),0.0);
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_dest[index+2]=std::complex<float>(float(a[2]),0.0);
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_dest[index+3]=std::complex<float>(float(a[3]),0.0);
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index = index + 4;
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}
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}
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else
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{
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for (size_t i = 0; i < Galileo_E5a_I_PRIMARY_CODE[prn].length(); i++)
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{
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// hex_to_binary_converter(&_code_int[index],
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// Galileo_E5a_I_PRIMARY_CODE[prn].at(i));
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hex_to_binary_converter(&a[0],
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Galileo_E5a_I_PRIMARY_CODE[prn].at(i));
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_dest[index]=std::complex<float>(float(a[0]),0.0);
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_dest[index+1]=std::complex<float>(float(a[1]),0.0);
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_dest[index+2]=std::complex<float>(float(a[2]),0.0);
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_dest[index+3]=std::complex<float>(float(a[3]),0.0);
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index = index + 4;
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}
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}
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}
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void galileo_e5_a_code_gen_complex_sampled(std::complex<float>* _dest, bool _pilot,
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unsigned int _prn, signed int _fs, unsigned int _chip_shift,
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bool _secondary_flag)
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{
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// This function is based on the GNU software GPS for MATLAB in the Kay Borre book
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std::complex<float> _code[Galileo_E5a_CODE_LENGTH_CHIPS];
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signed int _samplesPerCode, _codeValueIndex;
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float _ts;
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float _tc;
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const int _codeFreqBasis = Galileo_E5a_CODE_CHIP_RATE_HZ; //Hz
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unsigned int _codeLength = Galileo_E5a_CODE_LENGTH_CHIPS;
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std::complex<float> primary_code_E5a_chips[(int)Galileo_E5a_CODE_LENGTH_CHIPS];
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_samplesPerCode = round(_fs / (_codeFreqBasis / _codeLength));
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const unsigned int delay = (((int)Galileo_E5a_CODE_LENGTH_CHIPS - _chip_shift)
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% (int)Galileo_E5a_CODE_LENGTH_CHIPS)
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* _samplesPerCode / Galileo_E5a_CODE_LENGTH_CHIPS;
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galileo_e5_a_code_gen_complex(_code , _prn , _pilot);
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if (_fs != _codeFreqBasis)
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{
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std::complex<float>* _resampled_signal = new std::complex<float>[_codeLength];
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resampler(_code, _resampled_signal, _codeFreqBasis, _fs,
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_codeLength, _samplesPerCode); //resamples code to fs
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delete[] _code;
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_code = _resampled_signal;
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}
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// TODO generar codigo secundario cuando sepamos si se hace aqui o se replica en el tracking
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// o en una funcion a parte en esta misma clase
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for (unsigned int i = 0; i < _samplesPerCode; i++)
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{
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_dest[(i+delay)%_samplesPerCode] = _code[i];
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}
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delete[] _code;
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}
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