mirror of https://github.com/gnss-sdr/gnss-sdr
217 lines
10 KiB
C++
217 lines
10 KiB
C++
/*!
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* \file galileo_e5_signal_replica.cc
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* \brief This library implements various functions for Galileo E5 signal
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* replica generation
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* \author Marc Sales, 2014. marcsales92(at)gmail.com
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* \author Piyush Gupta, 2020. piyush04111999@gmail.com
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* \note Code added as part of GSoc 2020 Program.
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*
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*
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* -----------------------------------------------------------------------------
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*
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* GNSS-SDR is a Global Navigation Satellite System software-defined receiver.
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* This file is part of GNSS-SDR.
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*
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* Copyright (C) 2010-2020 (see AUTHORS file for a list of contributors)
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* SPDX-License-Identifier: GPL-3.0-or-later
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*
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* -----------------------------------------------------------------------------
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*/
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#include "galileo_e5_signal_replica.h"
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#include "Galileo_E5a.h"
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#include "Galileo_E5b.h"
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#include "gnss_signal_replica.h"
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#include <gnuradio/gr_complex.h>
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#include <memory>
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#include <utility>
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#include <vector>
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void galileo_e5_a_code_gen_complex_primary(own::span<std::complex<float>> dest,
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int32_t prn,
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const std::array<char, 3>& signal_id)
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{
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const uint32_t prn_ = prn - 1;
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uint32_t index = 0;
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std::array<int32_t, 4> a{};
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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 (signal_id[0] == '5' && signal_id[1] == 'Q')
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{
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for (size_t i = 0; i < GALILEO_E5A_Q_PRIMARY_CODE_STR_LENGTH - 1; i++)
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{
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hex_to_binary_converter(a, GALILEO_E5A_Q_PRIMARY_CODE[prn_][i]);
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dest[index] = std::complex<float>(static_cast<float>(a[0]), 0.0);
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dest[index + 1] = std::complex<float>(static_cast<float>(a[1]), 0.0);
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dest[index + 2] = std::complex<float>(static_cast<float>(a[2]), 0.0);
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dest[index + 3] = std::complex<float>(static_cast<float>(a[3]), 0.0);
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index = index + 4;
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}
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// last 2 bits are filled up zeros
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hex_to_binary_converter(a, GALILEO_E5A_Q_PRIMARY_CODE[prn_][GALILEO_E5A_Q_PRIMARY_CODE_STR_LENGTH - 1]);
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dest[index] = std::complex<float>(static_cast<float>(a[0]), 0.0);
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dest[index + 1] = std::complex<float>(static_cast<float>(a[1]), 0.0);
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}
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else if (signal_id[0] == '5' && signal_id[1] == 'I')
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{
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for (size_t i = 0; i < GALILEO_E5A_I_PRIMARY_CODE_STR_LENGTH - 1; i++)
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{
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hex_to_binary_converter(a, GALILEO_E5A_I_PRIMARY_CODE[prn_][i]);
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dest[index] = std::complex<float>(static_cast<float>(a[0]), 0.0);
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dest[index + 1] = std::complex<float>(static_cast<float>(a[1]), 0.0);
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dest[index + 2] = std::complex<float>(static_cast<float>(a[2]), 0.0);
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dest[index + 3] = std::complex<float>(static_cast<float>(a[3]), 0.0);
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index = index + 4;
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}
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// last 2 bits are filled up zeros
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hex_to_binary_converter(a, GALILEO_E5A_I_PRIMARY_CODE[prn_][GALILEO_E5A_I_PRIMARY_CODE_STR_LENGTH - 1]);
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dest[index] = std::complex<float>(static_cast<float>(a[0]), 0.0);
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dest[index + 1] = std::complex<float>(static_cast<float>(a[1]), 0.0);
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}
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else if (signal_id[0] == '5' && signal_id[1] == 'X')
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{
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std::array<int32_t, 4> b{};
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for (size_t i = 0; i < GALILEO_E5A_I_PRIMARY_CODE_STR_LENGTH - 1; i++)
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{
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hex_to_binary_converter(a, GALILEO_E5A_I_PRIMARY_CODE[prn_][i]);
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hex_to_binary_converter(b, GALILEO_E5A_Q_PRIMARY_CODE[prn_][i]);
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dest[index] = std::complex<float>(static_cast<float>(a[0]), static_cast<float>(b[0]));
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dest[index + 1] = std::complex<float>(static_cast<float>(a[1]), static_cast<float>(b[1]));
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dest[index + 2] = std::complex<float>(static_cast<float>(a[2]), static_cast<float>(b[2]));
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dest[index + 3] = std::complex<float>(static_cast<float>(a[3]), static_cast<float>(b[3]));
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index = index + 4;
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}
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// last 2 bits are filled up zeros
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hex_to_binary_converter(a, GALILEO_E5A_I_PRIMARY_CODE[prn_][GALILEO_E5A_I_PRIMARY_CODE_STR_LENGTH - 1]);
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hex_to_binary_converter(b, GALILEO_E5A_Q_PRIMARY_CODE[prn_][GALILEO_E5A_Q_PRIMARY_CODE_STR_LENGTH - 1]);
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dest[index] = std::complex<float>(static_cast<float>(a[0]), static_cast<float>(b[0]));
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dest[index + 1] = std::complex<float>(static_cast<float>(a[1]), static_cast<float>(b[1]));
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}
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}
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void galileo_e5_a_code_gen_complex_sampled(own::span<std::complex<float>> dest,
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uint32_t prn,
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const std::array<char, 3>& signal_id,
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int32_t sampling_freq,
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uint32_t chip_shift)
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{
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constexpr uint32_t codeLength = GALILEO_E5A_CODE_LENGTH_CHIPS;
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constexpr int32_t codeFreqBasis = GALILEO_E5A_CODE_CHIP_RATE_CPS;
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const auto samplesPerCode = static_cast<uint32_t>(static_cast<double>(sampling_freq) / (static_cast<double>(codeFreqBasis) / static_cast<double>(codeLength)));
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const uint32_t delay = ((codeLength - chip_shift) % codeLength) * samplesPerCode / codeLength;
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std::vector<std::complex<float>> code_aux(codeLength);
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galileo_e5_a_code_gen_complex_primary(code_aux, prn, signal_id);
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if (sampling_freq != codeFreqBasis)
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{
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std::vector<std::complex<float>> resampled_signal_aux(samplesPerCode);
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resampler(code_aux, resampled_signal_aux, codeFreqBasis, sampling_freq); // resamples code to sampling_freq
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code_aux = std::move(resampled_signal_aux);
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}
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for (uint32_t i = 0; i < samplesPerCode; i++)
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{
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dest[(i + delay) % samplesPerCode] = code_aux[i];
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}
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}
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void galileo_e5_b_code_gen_complex_primary(own::span<std::complex<float>> dest,
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int32_t prn,
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const std::array<char, 3>& signal_id)
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{
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const uint32_t prn_ = prn - 1;
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uint32_t index = 0;
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std::array<int32_t, 4> a{};
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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 (signal_id[0] == '7' && signal_id[1] == 'Q')
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{
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for (size_t i = 0; i < GALILEO_E5B_Q_PRIMARY_CODE_STR_LENGTH - 1; i++)
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{
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hex_to_binary_converter(a, GALILEO_E5B_Q_PRIMARY_CODE[prn_][i]);
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dest[index] = std::complex<float>(static_cast<float>(a[0]), 0.0);
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dest[index + 1] = std::complex<float>(static_cast<float>(a[1]), 0.0);
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dest[index + 2] = std::complex<float>(static_cast<float>(a[2]), 0.0);
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dest[index + 3] = std::complex<float>(static_cast<float>(a[3]), 0.0);
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index = index + 4;
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}
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// last 2 bits are filled up zeros
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hex_to_binary_converter(a, GALILEO_E5B_Q_PRIMARY_CODE[prn_][GALILEO_E5B_Q_PRIMARY_CODE_STR_LENGTH - 1]);
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dest[index] = std::complex<float>(static_cast<float>(a[0]), 0.0);
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dest[index + 1] = std::complex<float>(static_cast<float>(a[1]), 0.0);
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}
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else if (signal_id[0] == '7' && signal_id[1] == 'I')
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{
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for (size_t i = 0; i < GALILEO_E5B_I_PRIMARY_CODE_STR_LENGTH - 1; i++)
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{
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hex_to_binary_converter(a, GALILEO_E5B_I_PRIMARY_CODE[prn_][i]);
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dest[index] = std::complex<float>(static_cast<float>(a[0]), 0.0);
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dest[index + 1] = std::complex<float>(static_cast<float>(a[1]), 0.0);
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dest[index + 2] = std::complex<float>(static_cast<float>(a[2]), 0.0);
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dest[index + 3] = std::complex<float>(static_cast<float>(a[3]), 0.0);
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index = index + 4;
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}
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// last 2 bits are filled up zeros
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hex_to_binary_converter(a, GALILEO_E5B_I_PRIMARY_CODE[prn_][GALILEO_E5B_I_PRIMARY_CODE_STR_LENGTH - 1]);
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dest[index] = std::complex<float>(static_cast<float>(a[0]), 0.0);
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dest[index + 1] = std::complex<float>(static_cast<float>(a[1]), 0.0);
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}
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else if (signal_id[0] == '7' && signal_id[1] == 'X')
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{
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std::array<int32_t, 4> b{};
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for (size_t i = 0; i < GALILEO_E5B_I_PRIMARY_CODE_STR_LENGTH - 1; i++)
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{
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hex_to_binary_converter(a, GALILEO_E5B_I_PRIMARY_CODE[prn_][i]);
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hex_to_binary_converter(b, GALILEO_E5B_Q_PRIMARY_CODE[prn_][i]);
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dest[index] = std::complex<float>(static_cast<float>(a[0]), static_cast<float>(b[0]));
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dest[index + 1] = std::complex<float>(static_cast<float>(a[1]), static_cast<float>(b[1]));
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dest[index + 2] = std::complex<float>(static_cast<float>(a[2]), static_cast<float>(b[2]));
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dest[index + 3] = std::complex<float>(static_cast<float>(a[3]), static_cast<float>(b[3]));
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index = index + 4;
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}
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// last 2 bits are filled up zeros
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hex_to_binary_converter(a, GALILEO_E5B_I_PRIMARY_CODE[prn_][GALILEO_E5B_I_PRIMARY_CODE_STR_LENGTH - 1]);
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hex_to_binary_converter(b, GALILEO_E5B_Q_PRIMARY_CODE[prn_][GALILEO_E5B_Q_PRIMARY_CODE_STR_LENGTH - 1]);
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dest[index] = std::complex<float>(static_cast<float>(a[0]), static_cast<float>(b[0]));
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dest[index + 1] = std::complex<float>(static_cast<float>(a[1]), static_cast<float>(b[1]));
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}
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}
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void galileo_e5_b_code_gen_complex_sampled(own::span<std::complex<float>> dest,
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uint32_t prn,
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const std::array<char, 3>& signal_id,
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int32_t sampling_freq,
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uint32_t chip_shift)
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{
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constexpr uint32_t codeLength = GALILEO_E5B_CODE_LENGTH_CHIPS;
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constexpr int32_t codeFreqBasis = GALILEO_E5B_CODE_CHIP_RATE_CPS;
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const auto samplesPerCode = static_cast<uint32_t>(static_cast<double>(sampling_freq) / (static_cast<double>(codeFreqBasis) / static_cast<double>(codeLength)));
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const uint32_t delay = ((codeLength - chip_shift) % codeLength) * samplesPerCode / codeLength;
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std::vector<std::complex<float>> code_aux(codeLength);
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galileo_e5_b_code_gen_complex_primary(code_aux, prn, signal_id);
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if (sampling_freq != codeFreqBasis)
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{
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std::vector<std::complex<float>> resampled_signal_aux(samplesPerCode);
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resampler(code_aux, resampled_signal_aux, codeFreqBasis, sampling_freq); // resamples code to sampling_freq
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code_aux = std::move(resampled_signal_aux);
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}
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for (uint32_t i = 0; i < samplesPerCode; i++)
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{
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dest[(i + delay) % samplesPerCode] = code_aux[i];
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}
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}
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