mirror of https://github.com/gnss-sdr/gnss-sdr
108 lines
4.8 KiB
C++
108 lines
4.8 KiB
C++
/*!
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* \file GPS_L2C.h
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* \brief Defines system parameters for GPS L2C signal
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* \author Javier Arribas, 2015. jarribas(at)cttc.es
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*
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* -------------------------------------------------------------------------
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*
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* Copyright (C) 2010-2018 (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 <https://www.gnu.org/licenses/>.
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*
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* -------------------------------------------------------------------------
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*/
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#ifndef GNSS_SDR_GPS_L2C_H_
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#define GNSS_SDR_GPS_L2C_H_
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#include "gnss_frequencies.h"
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#include "GPS_CNAV.h"
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#include "MATH_CONSTANTS.h"
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#include <cstdint>
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#include <vector>
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#include <utility> // std::pair
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// Physical constants
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const double GPS_L2_C_m_s = 299792458.0; //!< The speed of light, [m/s]
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const double GPS_L2_C_m_ms = 299792.4580; //!< The speed of light, [m/ms]
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const double GPS_L2_PI = 3.1415926535898; //!< Pi as defined in IS-GPS-200E
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const double GPS_L2_TWO_PI = 6.283185307179586; //!< 2Pi as defined in IS-GPS-200E
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const double GPS_L2_OMEGA_EARTH_DOT = 7.2921151467e-5; //!< Earth rotation rate, [rad/s]
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const double GPS_L2_GM = 3.986005e14; //!< Universal gravitational constant times the mass of the Earth, [m^3/s^2]
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const double GPS_L2_F = -4.442807633e-10; //!< Constant, [s/(m)^(1/2)]
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// carrier and code frequencies
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const double GPS_L2_FREQ_HZ = FREQ2; //!< L2 [Hz]
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const double GPS_L2_M_CODE_RATE_HZ = 0.5115e6; //!< GPS L2 M code rate [chips/s]
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const int32_t GPS_L2_M_CODE_LENGTH_CHIPS = 10230; //!< GPS L2 M code length [chips]
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const double GPS_L2_M_PERIOD = 0.02; //!< GPS L2 M code period [seconds]
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const double GPS_L2_L_CODE_RATE_HZ = 0.5115e6; //!< GPS L2 L code rate [chips/s]
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const int32_t GPS_L2_L_CODE_LENGTH_CHIPS = 767250; //!< GPS L2 L code length [chips]
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const double GPS_L2_L_PERIOD = 1.5; //!< GPS L2 L code period [seconds]
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const int32_t GPS_L2C_HISTORY_DEEP = 5;
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//optimum parameters
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const uint32_t GPS_L2C_OPT_ACQ_FS_HZ = 2000000; //!< Sampling frequncy that maximizes the acquisition SNR while using a non-multiple of chip rate
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const int32_t GPS_L2C_M_INIT_REG[115] =
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{0742417664, 0756014035, 0002747144, 0066265724, // 1:4
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0601403471, 0703232733, 0124510070, 0617316361, // 5:8
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0047541621, 0733031046, 0713512145, 0024437606,
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0021264003, 0230655351, 0001314400, 0222021506,
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0540264026, 0205521705, 0064022144, 0120161274,
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0044023533, 0724744327, 0045743577, 0741201660,
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0700274134, 0010247261, 0713433445, 0737324162,
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0311627434, 0710452007, 0722462133, 0050172213,
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0500653703, 0755077436, 0136717361, 0756675453,
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0435506112, 0771353753, 0226107701, 0022025110,
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0402466344, 0752566114, 0702011164, 0041216771,
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0047457275, 0266333164, 0713167356, 0060546335,
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0355173035, 0617201036, 0157465571, 0767360553,
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0023127030, 0431343777, 0747317317, 0045706125,
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0002744276, 0060036467, 0217744147, 0603340174, // 57:60
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0326616775, 0063240065, 0111460621, // 61:63
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0604055104, 0157065232, 0013305707, 0603552017, // 159:162
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0230461355, 0603653437, 0652346475, 0743107103,
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0401521277, 0167335110, 0014013575, 0362051132,
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0617753265, 0216363634, 0755561123, 0365304033,
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0625025543, 0054420334, 0415473671, 0662364360,
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0373446602, 0417564100, 0000526452, 0226631300,
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0113752074, 0706134401, 0041352546, 0664630154,
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0276524255, 0714720530, 0714051771, 0044526647,
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0207164322, 0262120161, 0204244652, 0202133131,
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0714351204, 0657127260, 0130567507, 0670517677,
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0607275514, 0045413633, 0212645405, 0613700455,
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0706202440, 0705056276, 0020373522, 0746013617,
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0132720621, 0434015513, 0566721727, 0140633660};
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const int32_t GPS_L2_CNAV_DATA_PAGE_BITS = 300; //!< GPS L2 CNAV page length, including preamble and CRC [bits]
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const int32_t GPS_L2_SYMBOLS_PER_BIT = 2;
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const int32_t GPS_L2_SAMPLES_PER_SYMBOL = 1;
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const int32_t GPS_L2_CNAV_DATA_PAGE_SYMBOLS = 600;
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const int32_t GPS_L2_CNAV_DATA_PAGE_DURATION_S = 12;
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#endif /* GNSS_SDR_GPS_L2C_H_ */
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