mirror of https://github.com/gnss-sdr/gnss-sdr
215 lines
8.4 KiB
C++
215 lines
8.4 KiB
C++
/*!
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* \file gps_l1_ca_dll_pll_tracking.cc
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* \brief Implementation of an adapter of a DLL+PLL tracking loop block
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* for GPS L1 C/A to a TrackingInterface
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* \author Carlos Aviles, 2010. carlos.avilesr(at)googlemail.com
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* Javier Arribas, 2011. jarribas(at)cttc.es
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*
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* Code DLL + carrier PLL according to the algorithms 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
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* Approach, Birkhauser, 2007
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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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#include "dll_pll_conf.h"
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#include "gps_l1_ca_dll_pll_tracking.h"
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#include "configuration_interface.h"
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#include "GPS_L1_CA.h"
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#include "gnss_sdr_flags.h"
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#include "display.h"
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#include <glog/logging.h>
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using google::LogMessage;
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void GpsL1CaDllPllTracking::stop_tracking()
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{
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tracking_->stop_tracking();
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}
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GpsL1CaDllPllTracking::GpsL1CaDllPllTracking(
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ConfigurationInterface* configuration, std::string role,
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unsigned int in_streams, unsigned int out_streams) : role_(role), in_streams_(in_streams), out_streams_(out_streams)
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{
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Dll_Pll_Conf trk_param = Dll_Pll_Conf();
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DLOG(INFO) << "role " << role;
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//################# CONFIGURATION PARAMETERS ########################
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std::string default_item_type = "gr_complex";
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std::string item_type = configuration->property(role + ".item_type", default_item_type);
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int fs_in_deprecated = configuration->property("GNSS-SDR.internal_fs_hz", 2048000);
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int fs_in = configuration->property("GNSS-SDR.internal_fs_sps", fs_in_deprecated);
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trk_param.fs_in = fs_in;
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trk_param.high_dyn = configuration->property(role + ".high_dyn", false);
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if (configuration->property(role + ".smoother_length", 10) < 1)
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{
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trk_param.smoother_length = 1;
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std::cout << TEXT_RED << "WARNING: GPS L1 C/A. smoother_length must be bigger than 0. It has been set to 1" << TEXT_RESET << std::endl;
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}
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else
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{
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trk_param.smoother_length = configuration->property(role + ".smoother_length", 10);
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}
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bool dump = configuration->property(role + ".dump", false);
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trk_param.dump = dump;
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float pll_bw_hz = configuration->property(role + ".pll_bw_hz", 50.0);
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if (FLAGS_pll_bw_hz != 0.0) pll_bw_hz = static_cast<float>(FLAGS_pll_bw_hz);
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trk_param.pll_bw_hz = pll_bw_hz;
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float pll_bw_narrow_hz = configuration->property(role + ".pll_bw_narrow_hz", 20.0);
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trk_param.pll_bw_narrow_hz = pll_bw_narrow_hz;
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float dll_bw_narrow_hz = configuration->property(role + ".dll_bw_narrow_hz", 2.0);
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trk_param.dll_bw_narrow_hz = dll_bw_narrow_hz;
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float dll_bw_hz = configuration->property(role + ".dll_bw_hz", 2.0);
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if (FLAGS_dll_bw_hz != 0.0) dll_bw_hz = static_cast<float>(FLAGS_dll_bw_hz);
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trk_param.dll_bw_hz = dll_bw_hz;
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float early_late_space_chips = configuration->property(role + ".early_late_space_chips", 0.5);
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trk_param.early_late_space_chips = early_late_space_chips;
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float early_late_space_narrow_chips = configuration->property(role + ".early_late_space_narrow_chips", 0.5);
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trk_param.early_late_space_narrow_chips = early_late_space_narrow_chips;
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std::string default_dump_filename = "./track_ch";
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std::string dump_filename = configuration->property(role + ".dump_filename", default_dump_filename);
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trk_param.dump_filename = dump_filename;
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int vector_length = std::round(fs_in / (GPS_L1_CA_CODE_RATE_HZ / GPS_L1_CA_CODE_LENGTH_CHIPS));
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trk_param.vector_length = vector_length;
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int symbols_extended_correlator = configuration->property(role + ".extend_correlation_symbols", 1);
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if (symbols_extended_correlator < 1)
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{
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symbols_extended_correlator = 1;
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std::cout << TEXT_RED << "WARNING: GPS L1 C/A. extend_correlation_symbols must be bigger than 1. Coherent integration has been set to 1 symbol (1 ms)" << TEXT_RESET << std::endl;
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}
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else if (symbols_extended_correlator > 20)
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{
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symbols_extended_correlator = 20;
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std::cout << TEXT_RED << "WARNING: GPS L1 C/A. extend_correlation_symbols must be lower than 21. Coherent integration has been set to 20 symbols (20 ms)" << TEXT_RESET << std::endl;
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}
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trk_param.extend_correlation_symbols = symbols_extended_correlator;
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bool track_pilot = configuration->property(role + ".track_pilot", false);
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if (track_pilot)
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{
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std::cout << TEXT_RED << "WARNING: GPS L1 C/A does not have pilot signal. Data tracking has been enabled" << TEXT_RESET << std::endl;
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}
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if ((symbols_extended_correlator > 1) and (pll_bw_narrow_hz > pll_bw_hz or dll_bw_narrow_hz > dll_bw_hz))
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{
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std::cout << TEXT_RED << "WARNING: GPS L1 C/A. PLL or DLL narrow tracking bandwidth is higher than wide tracking one" << TEXT_RESET << std::endl;
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}
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trk_param.very_early_late_space_chips = 0.0;
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trk_param.very_early_late_space_narrow_chips = 0.0;
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trk_param.track_pilot = false;
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trk_param.system = 'G';
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char sig_[3] = "1C";
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std::memcpy(trk_param.signal, sig_, 3);
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int cn0_samples = configuration->property(role + ".cn0_samples", 20);
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if (FLAGS_cn0_samples != 20) cn0_samples = FLAGS_cn0_samples;
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trk_param.cn0_samples = cn0_samples;
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int cn0_min = configuration->property(role + ".cn0_min", 30);
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if (FLAGS_cn0_min != 25) cn0_min = FLAGS_cn0_min;
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trk_param.cn0_min = cn0_min;
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int max_lock_fail = configuration->property(role + ".max_lock_fail", 50);
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if (FLAGS_max_lock_fail != 50) max_lock_fail = FLAGS_max_lock_fail;
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trk_param.max_lock_fail = max_lock_fail;
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double carrier_lock_th = configuration->property(role + ".carrier_lock_th", 0.80);
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if (FLAGS_carrier_lock_th != 0.85) carrier_lock_th = FLAGS_carrier_lock_th;
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trk_param.carrier_lock_th = carrier_lock_th;
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//################# MAKE TRACKING GNURadio object ###################
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if (item_type.compare("gr_complex") == 0)
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{
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item_size_ = sizeof(gr_complex);
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tracking_ = dll_pll_veml_make_tracking(trk_param);
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}
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else
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{
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item_size_ = sizeof(gr_complex);
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LOG(WARNING) << item_type << " unknown tracking item type.";
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}
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channel_ = 0;
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DLOG(INFO) << "tracking(" << tracking_->unique_id() << ")";
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if (in_streams_ > 1)
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{
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LOG(ERROR) << "This implementation only supports one input stream";
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}
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if (out_streams_ > 1)
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{
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LOG(ERROR) << "This implementation only supports one output stream";
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}
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}
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GpsL1CaDllPllTracking::~GpsL1CaDllPllTracking()
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{
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}
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void GpsL1CaDllPllTracking::start_tracking()
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{
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tracking_->start_tracking();
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}
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/*
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* Set tracking channel unique ID
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*/
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void GpsL1CaDllPllTracking::set_channel(unsigned int channel)
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{
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channel_ = channel;
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tracking_->set_channel(channel);
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}
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void GpsL1CaDllPllTracking::set_gnss_synchro(Gnss_Synchro* p_gnss_synchro)
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{
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tracking_->set_gnss_synchro(p_gnss_synchro);
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}
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void GpsL1CaDllPllTracking::connect(gr::top_block_sptr top_block)
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{
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if (top_block)
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{ /* top_block is not null */
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};
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//nothing to connect, now the tracking uses gr_sync_decimator
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}
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void GpsL1CaDllPllTracking::disconnect(gr::top_block_sptr top_block)
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{
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if (top_block)
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{ /* top_block is not null */
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};
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//nothing to disconnect, now the tracking uses gr_sync_decimator
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}
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gr::basic_block_sptr GpsL1CaDllPllTracking::get_left_block()
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{
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return tracking_;
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}
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gr::basic_block_sptr GpsL1CaDllPllTracking::get_right_block()
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{
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return tracking_;
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}
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