mirror of https://github.com/gnss-sdr/gnss-sdr
62 lines
2.1 KiB
C++
62 lines
2.1 KiB
C++
/*!
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* \file tracking_2rd_DLL_filter.h
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* \brief Class that implements 2 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 2 order PLL filter for code tracking loop. The algorithm is described in [1]
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*
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* [1] K.Borre, D.M.Akos, N.Bertelsen, P.Rinder, and S.~H.~Jensen, 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) 2010-2011 (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 TRACKING_2RD_DLL_FILTER_H_
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#define TRACKING_2RD_DLL_FILTER_H_
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class tracking_2rd_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;
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float d_tau2_code;
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float d_pdi_code;
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float d_dllnoisebandwidth;
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float d_dlldampingratio;
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float d_old_code_error;
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float d_old_code_nco;
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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);
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void initialize(float d_acq_code_phase_samples);
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float get_code_nco(float DLL_discriminator);
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tracking_2rd_DLL_filter();
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~tracking_2rd_DLL_filter();
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};
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#endif
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