mirror of https://github.com/gnss-sdr/gnss-sdr
209 lines
6.5 KiB
C++
209 lines
6.5 KiB
C++
/*!
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* \file gps_l1_ca_dll_fll_pll_tracking_cc.h
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* \brief code DLL + carrier FLL/PLL tracking
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* \author Javier Arribas, 2011. jarribas(at)cttc.es
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*
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* This file implements the code Delay Locked Loop (DLL) +
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* carrier Phase Locked Loop (PLL) helped with a carrier Frequency Locked Loop (FLL) stage
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* according to the algorithms described in [1]
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* [1] E.D. Kaplan and C. Hegarty, Understanding GPS. Principles and
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* Applications, Second Edition, Artech House Publishers, 2005.
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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 GNSS_SDR_GPS_L1_CA_DLL_FLL_PLL_TRACKING_CC_H
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#define GNSS_SDR_GPS_L1_CA_DLL_FLL_PLL_TRACKING_CC_H
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#include <fstream>
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#include <gnuradio/gr_block.h>
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#include <gnuradio/gr_msg_queue.h>
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//#include <gnuradio/gr_sync_decimator.h>
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#include "gps_sdr_signal_processing.h"
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#include "tracking_FLL_PLL_filter.h"
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#include <queue>
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#include <boost/thread/mutex.hpp>
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#include <boost/thread/thread.hpp>
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#include "concurrent_queue.h"
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class gps_l1_ca_dll_fll_pll_tracking_cc;
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typedef boost::shared_ptr<gps_l1_ca_dll_fll_pll_tracking_cc>
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gps_l1_ca_dll_fll_pll_tracking_cc_sptr;
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gps_l1_ca_dll_fll_pll_tracking_cc_sptr
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gps_l1_ca_dll_fll_pll_make_tracking_cc(unsigned int satellite,
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long if_freq,
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long fs_in,
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unsigned int vector_length,
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gr_msg_queue_sptr queue,
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bool dump,
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std::string dump_filename,
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int order,
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float fll_bw_hz,
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float pll_bw_hz,
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float dll_bw_hz,
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float early_late_space_chips);
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//class gps_l1_ca_dll_pll_tracking_cc: public gr_sync_decimator
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/*!
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* \brief This class implements a DLL and a FLL assisted PLL tracking loop block
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*/
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class gps_l1_ca_dll_fll_pll_tracking_cc: public gr_block
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{
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private:
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friend gps_l1_ca_dll_fll_pll_tracking_cc_sptr
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gps_l1_ca_dll_fll_pll_make_tracking_cc(unsigned int satellite,
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long if_freq,
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long fs_in, unsigned
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int vector_length,
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gr_msg_queue_sptr queue,
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bool dump,
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std::string dump_filename,
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int order,
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float fll_bw_hz,
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float pll_bw_hz,
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float dll_bw_hz,
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float early_late_space_chips);
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gps_l1_ca_dll_fll_pll_tracking_cc(unsigned int satellite,
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long if_freq,
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long fs_in, unsigned
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int vector_length,
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gr_msg_queue_sptr queue,
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bool dump,
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std::string dump_filename,
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int order,
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float fll_bw_hz,
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float pll_bw_hz,
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float dll_bw_hz,
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float early_late_space_chips);
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void CN0_estimation_and_lock_detectors();
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// class private vars
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gr_msg_queue_sptr d_queue;
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concurrent_queue<int> *d_channel_internal_queue;
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unsigned int d_vector_length;
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bool d_dump;
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unsigned int d_satellite;
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unsigned int d_channel;
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int d_last_seg;
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long d_if_freq;
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long d_fs_in;
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gr_complex* d_ca_code;
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gr_complex* d_early_code;
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gr_complex* d_late_code;
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gr_complex* d_prompt_code;
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gr_complex* d_carr_sign;
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gr_complex d_Early;
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gr_complex d_Prompt;
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gr_complex d_Prompt_prev;
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gr_complex d_Late;
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float d_early_late_spc_chips;
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float d_carrier_doppler_hz;
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float d_code_freq_hz;
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float d_code_phase_samples;
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int d_current_prn_length_samples;
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int d_next_prn_length_samples;
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int d_FLL_wait;
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float d_rem_carr_phase;
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float d_rem_code_phase_samples;
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float d_next_rem_code_phase_samples;
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bool d_pull_in;
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// acquisition
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float d_acq_code_phase_samples;
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float d_acq_carrier_doppler_hz;
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// FLL + PLL filter
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float d_FLL_discriminator_hz; // This is a class variable because FLL needs to have memory
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tracking_FLL_PLL_filter d_carrier_loop_filter;
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float d_acc_carrier_phase_rad;
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unsigned long int d_sample_counter;
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double d_sample_counter_seconds;
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unsigned long int d_acq_sample_stamp;
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// CN0 estimation and lock detector
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int d_cn0_estimation_counter;
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gr_complex* d_Prompt_buffer;
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float d_carrier_lock_test;
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float d_CN0_SNV_dB_Hz;
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float d_carrier_lock_threshold;
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int d_carrier_lock_fail_counter;
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bool d_enable_tracking;
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std::string d_dump_filename;
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std::ofstream d_dump_file;
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public:
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~gps_l1_ca_dll_fll_pll_tracking_cc();
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void set_satellite(unsigned int satellite);
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void set_channel(unsigned int channel);
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void set_acq_code_phase(float code_phase);
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void set_acq_doppler(float doppler);
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void start_tracking();
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void update_local_code();
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void update_local_carrier();
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void set_FLL_and_PLL_BW(float fll_bw_hz,float pll_bw_hz);
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void set_acq_sample_stamp(unsigned long int sample_stamp);
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void set_channel_queue(concurrent_queue<int> *channel_internal_queue);
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/*!
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* \brief just like gr_block::general_work, only this arranges to call consume_each for you
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*
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* The user must override work to define the signal processing code
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*/
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//virtual int work (int noutput_items,
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// gr_vector_const_void_star &input_items,
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// gr_vector_void_star &output_items) = 0;
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//int work(int noutput_items, gr_vector_const_void_star &input_items, gr_vector_void_star &output_items);
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int general_work (int noutput_items, gr_vector_int &ninput_items,
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gr_vector_const_void_star &input_items, gr_vector_void_star &output_items);
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void forecast (int noutput_items, gr_vector_int &ninput_items_required);
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};
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#endif //GNSS_SDR_GPS_L1_CA_DLL_FLL_PLL_TRACKING_CC_H
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