mirror of https://github.com/gnss-sdr/gnss-sdr
81 lines
2.2 KiB
C++
81 lines
2.2 KiB
C++
/*!
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* \file cordic.h
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* \brief Interface of the CORDIC (COordinate Rotation DIgital Computer) algorithm.
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* \author Carles Fernandez-Prades, 2012. cfernandez(at)cttc.es
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*
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*
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* -------------------------------------------------------------------------
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*
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* Copyright (C) 2010-2012 (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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#ifndef GNSS_SDR_CORDIC_H_
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#define GNSS_SDR_CORDIC_H_
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typedef struct tagCORDIC_TABLE {
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double K;
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double phase_rads;
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} CORDIC_TABLE;
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/*!
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* \brief Implementation of the CORDIC (COordinate Rotation DIgital Computer) algorithm.
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* This implementation is NOT OPTIMIZED, only for demonstration purposes
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*/
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class Cordic
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{
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public:
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/*!
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* \brief construct the CORDIC table which will be of size "largest_k + 1".
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*/
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Cordic(int largest_k);
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/*!
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* \brief Frees the CORDIC table's memory
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*/
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~Cordic();
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/*!
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* \brief Calculates the magnitude and phase of "I + jQ". p_phase_rads is in radians
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*/
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void cordic_get_mag_phase(double I, double Q, double &p_mag, double &p_phase_rads);
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/* calculate the magnitude and phase of "I + jQ". phase is in radians */
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/*!
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* \brief Calculates the cosine and sine of the desired phase in radians
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*/
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void cordic_get_cos_sin(double desired_phase_rads, double &p_cos, double &p_sin);
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private:
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CORDIC_TABLE *mp_cordic_table;
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int m_max_L;
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double m_mag_scale;
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};
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#endif
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