mirror of https://github.com/gnss-sdr/gnss-sdr
170 lines
5.5 KiB
C++
170 lines
5.5 KiB
C++
/*!
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* \file gps_l1_ca_dll_fll_pll_tracking.cc
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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) + 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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#include "gps_l1_ca_dll_fll_pll_tracking.h"
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#include "GPS_L1_CA.h"
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#include "configuration_interface.h"
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#include <gnuradio/gr_io_signature.h>
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#include <glog/log_severity.h>
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#include <glog/logging.h>
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using google::LogMessage;
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GpsL1CaDllFllPllTracking::GpsL1CaDllFllPllTracking(
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ConfigurationInterface* configuration, std::string role,
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unsigned int in_streams, unsigned int out_streams,
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gr_msg_queue_sptr queue) :
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role_(role), in_streams_(in_streams), out_streams_(out_streams), queue_(
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queue)
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{
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DLOG(INFO) << "role " << role;
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//DLOG(INFO) << "vector length " << vector_length;
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//################# CONFIGURATION PARAMETERS ########################
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int fs_in;
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int vector_length;
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int f_if;
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bool dump;
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std::string dump_filename;
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std::string item_type;
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std::string default_item_type = "gr_complex";
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float pll_bw_hz;
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float fll_bw_hz;
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float dll_bw_hz;
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float early_late_space_chips;
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int order;
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item_type = configuration->property(role + ".item_type",default_item_type);
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//vector_length = configuration->property(role + ".vector_length", 2048);
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fs_in = configuration->property("GNSS-SDR.internal_fs_hz", 2048000);
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f_if = configuration->property(role + ".if", 0);
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dump = configuration->property(role + ".dump", false);
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order = configuration->property(role + ".order", 2);
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pll_bw_hz = configuration->property(role + ".pll_bw_hz", 50.0);
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fll_bw_hz = configuration->property(role + ".fll_bw_hz", 100.0);
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dll_bw_hz = configuration->property(role + ".dll_bw_hz", 2.0);
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early_late_space_chips = configuration->property(role + ".early_late_space_chips", 0.5);
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std::string default_dump_filename = "./track_ch";
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dump_filename = configuration->property(role + ".dump_filename",
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default_dump_filename); //unused!
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vector_length = std::round(fs_in / (GPS_L1_CA_CODE_RATE_HZ / GPS_L1_CA_CODE_LENGTH_CHIPS));
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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_ = gps_l1_ca_dll_fll_pll_make_tracking_cc(satellite_, f_if,
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fs_in, vector_length, queue_, dump, dump_filename, order, fll_bw_hz, pll_bw_hz,dll_bw_hz,early_late_space_chips);
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}
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else
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{
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LOG_AT_LEVEL(WARNING) << item_type << " unknown tracking item type.";
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}
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DLOG(INFO) << "tracking(" << tracking_->unique_id() << ")";
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}
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GpsL1CaDllFllPllTracking::~GpsL1CaDllFllPllTracking()
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{
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}
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void GpsL1CaDllFllPllTracking::start_tracking()
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{
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tracking_->start_tracking();
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}
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void GpsL1CaDllFllPllTracking::set_satellite(unsigned int satellite)
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{
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satellite_ = satellite;
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tracking_->set_satellite(satellite);
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DLOG(INFO) << "satellite set to " << satellite_;
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}
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void GpsL1CaDllFllPllTracking::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 GpsL1CaDllFllPllTracking::set_channel_queue(
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concurrent_queue<int> *channel_internal_queue)
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{
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channel_internal_queue_ = channel_internal_queue;
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tracking_->set_channel_queue(channel_internal_queue_);
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}
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void GpsL1CaDllFllPllTracking::set_prn_code_phase(signed int phase_samples)
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{
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return tracking_->set_acq_code_phase((float)phase_samples);
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}
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void GpsL1CaDllFllPllTracking::set_doppler_freq_shift(float doppler_freq_hz)
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{
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return tracking_->set_acq_doppler(doppler_freq_hz);
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}
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void GpsL1CaDllFllPllTracking::set_acq_sample_stamp(
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unsigned long int sample_stamp)
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{
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return tracking_->set_acq_sample_stamp(sample_stamp);
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}
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void GpsL1CaDllFllPllTracking::connect(gr_top_block_sptr top_block)
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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 GpsL1CaDllFllPllTracking::disconnect(gr_top_block_sptr top_block)
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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 GpsL1CaDllFllPllTracking::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 GpsL1CaDllFllPllTracking::get_right_block()
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{
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return tracking_;
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}
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