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tracking_2nd_DLL_filter.h
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tracking_2nd_DLL_filter.h
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/*!
* \file tracking_2nd_DLL_filter.h
* \brief Interface of a 2nd order DLL filter for code tracking loop.
* \author Javier Arribas, 2011. jarribas(at)cttc.es
*
* Class that implements a 2nd order PLL filter for code tracking loop.
* The algorithm is described in:
* K.Borre, D.M.Akos, N.Bertelsen, P.Rinder, and S. H. Jensen,
* A Software-Defined GPS and Galileo Receiver. A Single-Frequency Approach,
* Birkhauser, 2007, Applied and Numerical Harmonic Analysis.
*
* -------------------------------------------------------------------------
*
* Copyright (C) 2010-2015 (see AUTHORS file for a list of contributors)
*
* GNSS-SDR is a software defined Global Navigation
* Satellite Systems receiver
*
* This file is part of GNSS-SDR.
*
* GNSS-SDR is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GNSS-SDR is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNSS-SDR. If not, see <http://www.gnu.org/licenses/>.
*
* -------------------------------------------------------------------------
*/
#ifndef GNSS_SDR_TRACKING_2ND_DLL_FILTER_H_
#define GNSS_SDR_TRACKING_2ND_DLL_FILTER_H_
/*!
* \brief This class implements a 2nd order DLL filter for code tracking loop.
*
* The algorithm is described in:
* K.Borre, D.M.Akos, N.Bertelsen, P.Rinder, and S. H. Jensen, A Software-Defined GPS
* and Galileo Receiver. A Single-Frequency Approach,
* Birkhauser, 2007, Applied and Numerical Harmonic Analysis.
*/
class Tracking_2nd_DLL_filter
{
private:
// PLL filter parameters
float d_tau1_code = 0;
float d_tau2_code = 0;
float d_pdi_code = 0;
float d_dllnoisebandwidth = 0;
float d_dlldampingratio = 0;
float d_old_code_error = 0;
float d_old_code_nco = 0;
void calculate_lopp_coef(float* tau1,float* tau2, float lbw, float zeta, float k);
public:
void set_DLL_BW(float dll_bw_hz); //! Set DLL filter bandwidth [Hz]
void set_pdi(float pdi_code); //! Set Summation interval for code [s]
void initialize(); //! Start tracking with acquisition information
float get_code_nco(float DLL_discriminator); //! Numerically controlled oscillator
Tracking_2nd_DLL_filter(float pdi_code);
Tracking_2nd_DLL_filter();
~Tracking_2nd_DLL_filter();
};
#endif