mirror of https://github.com/gnss-sdr/gnss-sdr
72 lines
2.7 KiB
C++
72 lines
2.7 KiB
C++
/*!
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* \file tracking_2nd_DLL_filter.h
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* \brief Interface of a 2nd order DLL filter for code tracking loop.
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* \author Javier Arribas, 2011. jarribas(at)cttc.es
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*
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* Class that implements a 2nd order PLL filter for code tracking loop.
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* The algorithm is described in:
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* K.Borre, D.M.Akos, N.Bertelsen, P.Rinder, and S. H. Jensen,
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* A Software-Defined GPS and Galileo Receiver. A Single-Frequency Approach,
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* Birkhauser, 2007, Applied and Numerical Harmonic Analysis.
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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_TRACKING_2ND_DLL_FILTER_H_
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#define GNSS_SDR_TRACKING_2ND_DLL_FILTER_H_
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/*!
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* \brief This class implements a 2nd order DLL filter for code tracking loop.
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*
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* The algorithm is described in:
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* K.Borre, D.M.Akos, N.Bertelsen, P.Rinder, and S. H. Jensen, A Software-Defined GPS
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* and Galileo Receiver. A Single-Frequency Approach,
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* Birkhauser, 2007, Applied and Numerical Harmonic Analysis.
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*/
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class Tracking_2nd_DLL_filter
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{
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private:
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// PLL filter parameters
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float d_tau1_code = 0.0;
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float d_tau2_code = 0.0;
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float d_pdi_code = 0.0;
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float d_dllnoisebandwidth = 0.0;
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float d_dlldampingratio = 0.0;
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float d_old_code_error = 0.0;
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float d_old_code_nco = 0.0;
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void calculate_lopp_coef(float* tau1, float* tau2, float lbw, float zeta, float k);
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public:
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void set_DLL_BW(float dll_bw_hz); //! Set DLL filter bandwidth [Hz]
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void set_pdi(float pdi_code); //! Set Summation interval for code [s]
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void initialize(); //! Start tracking with acquisition information
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float get_code_nco(float DLL_discriminator); //! Numerically controlled oscillator
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Tracking_2nd_DLL_filter(float pdi_code);
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Tracking_2nd_DLL_filter();
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~Tracking_2nd_DLL_filter();
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};
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#endif
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