mirror of
https://github.com/gnss-sdr/gnss-sdr
synced 2024-09-17 01:39:47 +00:00
74 lines
2.5 KiB
C++
74 lines
2.5 KiB
C++
/*!
|
|
* \file tracking_2nd_PLL_filter.h
|
|
* \brief Interface of a 2nd order PLL filter for carrier tracking loop
|
|
* \author Javier Arribas, 2011. jarribas(at)cttc.es
|
|
*
|
|
* Class that implements 2 order PLL filter for tracking carrier 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_PLL_FILTER_H_
|
|
#define GNSS_SDR_TRACKING_2ND_PLL_FILTER_H_
|
|
|
|
/*!
|
|
* \brief This class implements a 2nd order PLL filter for carrier 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_PLL_filter
|
|
{
|
|
private:
|
|
// PLL filter parameters
|
|
float d_tau1_carr;
|
|
float d_tau2_carr;
|
|
float d_pdi_carr;
|
|
|
|
float d_pllnoisebandwidth;
|
|
float d_plldampingratio;
|
|
|
|
float d_old_carr_error;
|
|
float d_old_carr_nco;
|
|
|
|
void calculate_lopp_coef(float* tau1,float* tau2, float lbw, float zeta, float k);
|
|
|
|
public:
|
|
void set_PLL_BW(float pll_bw_hz); //! Set PLL loop bandwidth [Hz]
|
|
void set_pdi(float pdi_carr); //! Set Summation interval for code [s]
|
|
void initialize();
|
|
float get_carrier_nco(float PLL_discriminator);
|
|
Tracking_2nd_PLL_filter(float pdi_carr);
|
|
Tracking_2nd_PLL_filter();
|
|
~Tracking_2nd_PLL_filter();
|
|
};
|
|
|
|
#endif
|