Added PRS VEML tracking

For now this ignores the very early and very late correlators. Plan on
implementing:
1) Bump jumping
2) sliding subcarrier

approaches.

src/algorithms/tracking/adapters/CMakeLists.txt

@@ -34,6 +34,7 @@ set(TRACKING_ADAPTER_SOURCES
      gps_l2_m_dll_pll_tracking.cc
      galileo_e1_de_tracking.cc
      galileo_e1_prs_de_tracking.cc
+     galileo_e1_prs_veml_tracking.cc
      ${OPT_TRACKING_ADAPTERS}
 )
 

src/algorithms/tracking/adapters/galileo_e1_prs_veml_tracking.cc

@@ -0,0 +1,197 @@
+/*!
+ * \file galileo_e1_prs_veml_tracking.h
+ * \brief  Adapts a VEML tracking loop block
+ *   to a TrackingInterface for Galileo E1 signals including PRS
+ * \author Cillian O'Driscoll, 2015. cillian.odriscoll(at)gmail.com
+ *
+ * -------------------------------------------------------------------------
+ *
+ * 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/>.
+ *
+ * -------------------------------------------------------------------------
+ */
+
+#include "galileo_e1_prs_veml_tracking.h"
+#include <glog/logging.h>
+#include "GPS_L1_CA.h"
+#include "Galileo_E1.h"
+#include "configuration_interface.h"
+#include "spirent_prs_code_generator.h"
+
+
+using google::LogMessage;
+
+GalileoE1PrsVemlTracking::GalileoE1PrsVemlTracking(
+        ConfigurationInterface* configuration, std::string role,
+        unsigned int in_streams, unsigned int out_streams,
+        boost::shared_ptr<gr::msg_queue> queue) :
+        role_(role), in_streams_(in_streams), out_streams_(out_streams),
+        queue_(queue)
+{
+    DLOG(INFO) << "role " << role;
+    //################# CONFIGURATION PARAMETERS ########################
+    int fs_in;
+    int vector_length;
+    int f_if;
+    bool dump;
+    std::string dump_filename;
+    std::string item_type;
+    std::string default_item_type = "gr_complex";
+    float pll_initial_bw_hz;
+    float pll_final_bw_hz;
+    float dll_initial_bw_hz;
+    float dll_final_bw_hz;
+    int   pll_loop_order;
+    int   dll_loop_order;
+    float initial_early_late_code_space_cycles;
+    float final_early_late_code_space_cycles;
+    float initial_very_early_late_code_space_chips;
+    float final_very_early_late_code_space_chips;
+    bool aid_code_with_carrier;
+
+    item_type = configuration->property(role + ".item_type", default_item_type);
+    fs_in = configuration->property("GNSS-SDR.internal_fs_hz", 2048000);
+    f_if = configuration->property(role + ".if", 0);
+    dump = configuration->property(role + ".dump", false);
+    pll_initial_bw_hz = configuration->property(role + ".pll_initial_bw_hz", 15.0);
+    pll_final_bw_hz = configuration->property(role + ".pll_final_bw_hz", 15.0);
+    dll_initial_bw_hz = configuration->property(role + ".dll_initial_bw_hz", 0.5);
+    dll_final_bw_hz = configuration->property(role + ".dll_final_bw_hz", 0.5);
+    initial_early_late_code_space_cycles = configuration->property(role + ".initial_early_late_code_space_cycles", 0.125);
+    final_early_late_code_space_cycles = configuration->property(role + ".final_early_late_code_space_cycles", 0.125);
+    initial_very_early_late_code_space_chips = configuration->property(role + ".initial_very_early_late_code_space_chips", 0.5);
+    final_very_early_late_code_space_chips = configuration->property(role + ".final_very_early_late_code_space_chips", 0.5);
+    aid_code_with_carrier = configuration->property(role + ".aid_code_with_carrier", false );
+
+    pll_loop_order = configuration->property(role + ".pll_loop_order", 3);
+    dll_loop_order = configuration->property(role + ".dll_loop_order", 1);
+
+    std::string default_code_type = "Spirent";
+    std::string code_type = configuration->property(role + ".prs_code_type", default_code_type );
+
+    std::string default_dump_filename = "./track_de_";
+    dump_filename = configuration->property(role + ".dump_filename",
+            default_dump_filename); //unused!
+    vector_length = std::round(fs_in / (Galileo_E1_CODE_CHIP_RATE_HZ / Galileo_E1_B_CODE_LENGTH_CHIPS));
+
+    boost::shared_ptr< LongCodeInterface > code_gen;
+
+    if( not code_type.compare("Spirent") )// anything other than zero means not a match
+    {
+        code_gen = boost::shared_ptr< LongCodeInterface >(
+                new SpirentPrsCodeGenerator( 1, true ) );
+
+        if( code_gen == 0 )
+        {
+            LOG(ERROR) << "Unable to create a SpirentPrsCodeGenerator";
+        }
+    }
+    else
+    {
+        LOG(ERROR) << code_type << " unknown PRS code type";
+    }
+
+    //################# MAKE TRACKING GNURadio object ###################
+    if (item_type.compare("gr_complex") == 0)
+        {
+            item_size_ = sizeof(gr_complex);
+            tracking_ = galileo_e1_prs_veml_make_tracking_cc(
+                    f_if,
+                    fs_in,
+                    vector_length,
+                    queue_,
+                    dump,
+                    dump_filename,
+                    pll_loop_order, pll_initial_bw_hz, pll_final_bw_hz,
+                    dll_loop_order, dll_initial_bw_hz, dll_final_bw_hz,
+                    initial_early_late_code_space_cycles, final_early_late_code_space_cycles,
+                    initial_very_early_late_code_space_chips, final_very_early_late_code_space_chips,
+                    aid_code_with_carrier, code_gen);
+        }
+    else
+        {
+            item_size_ = sizeof(gr_complex);
+            LOG(WARNING) << item_type << " unknown tracking item type.";
+        }
+
+    channel_ = 0;
+    channel_internal_queue_ = 0;
+
+    DLOG(INFO) << "tracking(" << tracking_->unique_id() << ")";
+}
+
+GalileoE1PrsVemlTracking::~GalileoE1PrsVemlTracking()
+{}
+
+void GalileoE1PrsVemlTracking::start_tracking()
+{
+    tracking_->start_tracking();
+}
+
+/*
+ * Set tracking channel unique ID
+ */
+void GalileoE1PrsVemlTracking::set_channel(unsigned int channel)
+{
+    channel_ = channel;
+    tracking_->set_channel(channel);
+}
+
+/*
+ * Set tracking channel internal queue
+ */
+void GalileoE1PrsVemlTracking::set_channel_queue(
+        concurrent_queue<int> *channel_internal_queue)
+{
+    channel_internal_queue_ = channel_internal_queue;
+
+    tracking_->set_channel_queue(channel_internal_queue_);
+
+}
+
+void GalileoE1PrsVemlTracking::set_gnss_synchro(Gnss_Synchro* p_gnss_synchro)
+{
+    tracking_->set_gnss_synchro(p_gnss_synchro);
+}
+
+void GalileoE1PrsVemlTracking::connect(gr::top_block_sptr top_block)
+{
+	if(top_block) { /* top_block is not null */};
+	//nothing to connect, now the tracking uses gr_sync_decimator
+}
+
+void GalileoE1PrsVemlTracking::disconnect(gr::top_block_sptr top_block)
+{
+	if(top_block) { /* top_block is not null */};
+	//nothing to disconnect, now the tracking uses gr_sync_decimator
+}
+
+gr::basic_block_sptr GalileoE1PrsVemlTracking::get_left_block()
+{
+    return tracking_;
+}
+
+gr::basic_block_sptr GalileoE1PrsVemlTracking::get_right_block()
+{
+    return tracking_;
+}
+
+

src/algorithms/tracking/adapters/galileo_e1_prs_veml_tracking.h

@@ -0,0 +1,116 @@
+/*!
+ * \file galileo_e1_prs_veml_tracking.h
+ * \brief  Adapts a VEML tracking loop block
+ *   to a TrackingInterface for Galileo E1 signals inclding PRS
+ * \author Cillian O'Driscoll, 2015. cillian.odriscoll(at)gmail.com
+ *
+ *
+ * -------------------------------------------------------------------------
+ *
+ * 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_GALILEO_e1_prs_veml_TRACKING_H_
+#define GNSS_SDR_GALILEO_e1_prs_veml_TRACKING_H_
+
+#include <string>
+#include <gnuradio/msg_queue.h>
+#include "tracking_interface.h"
+#include "galileo_e1_prs_veml_tracking_cc.h"
+
+
+class ConfigurationInterface;
+
+/*!
+ * \brief This class Adapts a DLL+PLL VEML (Very Early Minus Late) tracking
+ * loop block to a TrackingInterface for Galileo E1 signals
+ */
+class GalileoE1PrsVemlTracking : public TrackingInterface
+{
+
+public:
+
+  GalileoE1PrsVemlTracking(ConfigurationInterface* configuration,
+            std::string role,
+            unsigned int in_streams,
+            unsigned int out_streams,
+            boost::shared_ptr<gr::msg_queue> queue);
+
+    virtual ~GalileoE1PrsVemlTracking();
+
+    std::string role()
+    {
+        return role_;
+    }
+
+    //! Returns "Galileo_E1_DE_Tracking"
+    std::string implementation()
+    {
+        return "Galileo_e1_prs_veml_Tracking";
+    }
+    size_t item_size()
+    {
+        return item_size_;
+    }
+
+    void connect(gr::top_block_sptr top_block);
+    void disconnect(gr::top_block_sptr top_block);
+    gr::basic_block_sptr get_left_block();
+    gr::basic_block_sptr get_right_block();
+
+
+    /*!
+     * \brief Set tracking channel unique ID
+     */
+    void set_channel(unsigned int channel);
+
+    /*!
+     * \brief Set acquisition/tracking common Gnss_Synchro object pointer
+     * to efficiently exchange synchronization data between acquisition and
+     *  tracking blocks
+     */
+    void set_gnss_synchro(Gnss_Synchro* p_gnss_synchro);
+
+    /*!
+     * \brief Set tracking channel internal queue
+     */
+    void set_channel_queue(concurrent_queue<int> *channel_internal_queue);
+
+    void start_tracking();
+
+private:
+
+    galileo_e1_prs_veml_tracking_cc_sptr tracking_;
+    size_t item_size_;
+
+    unsigned int channel_;
+
+    std::string role_;
+    unsigned int in_streams_;
+    unsigned int out_streams_;
+    boost::shared_ptr<gr::msg_queue> queue_;
+    concurrent_queue<int> *channel_internal_queue_;
+};
+
+#endif // GNSS_SDR_GALILEO_e1_prs_veml_TRACKING_H_
+

src/algorithms/tracking/gnuradio_blocks/CMakeLists.txt

@@ -36,6 +36,7 @@ set(TRACKING_GR_BLOCKS_SOURCES
      gps_l1_ca_dll_pll_c_aid_tracking_cc.cc
      galileo_e1_de_tracking_cc.cc
      galileo_e1_prs_de_tracking_cc.cc
+     galileo_e1_prs_veml_tracking_cc.cc
      ${OPT_TRACKING_BLOCKS}
 )
 

src/algorithms/tracking/gnuradio_blocks/galileo_e1_prs_veml_tracking_cc.h

@@ -0,0 +1,297 @@
+/*!
+ * \file galileo_e1_prs_veml_tracking_cc.h
+ * \brief Implementation of VEML tracking for Galileo E1 PRS
+ * \author Cillian O'Driscoll, 2015. cillian.odriscoll(at)gmail.com
+ *
+ * -------------------------------------------------------------------------
+ *
+ * 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_GALILEO_E1_PRS_VEML_TRACKING_CC_H
+#define GNSS_SDR_GALILEO_E1_PRS_VEML_TRACKING_CC_H
+
+#include <fstream>
+#include <queue>
+#include <string>
+#include <map>
+#include <boost/thread/mutex.hpp>
+#include <boost/thread/thread.hpp>
+#include <gnuradio/block.h>
+#include <gnuradio/msg_queue.h>
+#include "concurrent_queue.h"
+#include "gnss_synchro.h"
+#include "tracking_loop_filter.h"
+#include "correlator.h"
+#include "gnss_message.h"
+#include "long_code_interface.h" // for prs code gen
+
+class galileo_e1_prs_veml_tracking_cc;
+
+typedef boost::shared_ptr<galileo_e1_prs_veml_tracking_cc> galileo_e1_prs_veml_tracking_cc_sptr;
+
+galileo_e1_prs_veml_tracking_cc_sptr
+galileo_e1_prs_veml_make_tracking_cc(long if_freq,
+                                   long fs_in, unsigned
+                                   int vector_length,
+                                   boost::shared_ptr<gr::msg_queue> queue,
+                                   bool dump,
+                                   std::string dump_filename,
+                                   int   pll_loop_order,
+                                   float pll_initial_bw_hz,
+                                   float pll_final_bw_hz,
+                                   int   dll_loop_order,
+                                   float dll_initial_bw_hz,
+                                   float dll_final_bw_hz,
+                                   float initial_early_late_code_space_cycles,
+                                   float final_early_late_code_space_cycles,
+                                   float initial_very_early_late_code_space_chips,
+                                   float final_very_early_late_code_space_chips,
+                                   bool aid_code_with_carrier,
+                                   LongCodeInterface_sptr prs_code_gen);
+
+/*!
+ * \brief This class implements a double estimator tracking block for Galileo E1 signals
+ */
+class galileo_e1_prs_veml_tracking_cc: public gr::block
+{
+public:
+    ~galileo_e1_prs_veml_tracking_cc();
+
+    void set_channel(unsigned int channel);
+    void set_gnss_synchro(Gnss_Synchro* p_gnss_synchro);
+    void start_tracking();
+    void set_channel_queue(concurrent_queue<int> *channel_internal_queue);
+
+    /*!
+     * \brief Code DLL + carrier PLL according to the algorithms 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
+     */
+    int general_work (int noutput_items, gr_vector_int &ninput_items,
+            gr_vector_const_void_star &input_items, gr_vector_void_star &output_items);
+
+    void forecast (int noutput_items, gr_vector_int &ninput_items_required);
+private:
+    void start_tracking_prs();
+
+    friend galileo_e1_prs_veml_tracking_cc_sptr
+    galileo_e1_prs_veml_make_tracking_cc(long if_freq,
+            long fs_in, unsigned
+            int vector_length,
+            boost::shared_ptr<gr::msg_queue> queue,
+            bool dump,
+            std::string dump_filename,
+            int   pll_loop_order,
+            float pll_initial_bw_hz,
+            float pll_final_bw_hz,
+            int   dll_loop_order,
+            float dll_initial_bw_hz,
+            float dll_final_bw_hz,
+            float initial_early_late_code_space_cycles,
+            float final_early_late_code_space_cycles,
+            float initial_very_early_late_code_space_chips,
+            float final_very_early_late_code_space_chips,
+            bool aid_code_with_carrier,
+            LongCodeInterface_sptr prs_code_gen);
+
+    galileo_e1_prs_veml_tracking_cc(long if_freq,
+            long fs_in, unsigned
+            int vector_length,
+            boost::shared_ptr<gr::msg_queue> queue,
+            bool dump,
+            std::string dump_filename,
+            int   pll_loop_order,
+            float pll_initial_bw_hz,
+            float pll_final_bw_hz,
+            int   dll_loop_order,
+            float dll_initial_bw_hz,
+            float dll_final_bw_hz,
+            float initial_early_late_code_space_cycles,
+            float final_early_late_code_space_cycles,
+            float initial_very_early_late_code_space_chips,
+            float final_very_early_late_code_space_chips,
+            bool aid_code_with_carrier,
+            LongCodeInterface_sptr prs_code_gen);
+
+    void update_local_code();
+    void update_local_code_prs();
+
+    void update_local_carrier();
+
+    // tracking configuration vars
+    boost::shared_ptr<gr::msg_queue> d_queue;
+    concurrent_queue<int> *d_channel_internal_queue;
+    unsigned int d_vector_length;
+    bool d_dump;
+
+    Gnss_Synchro* d_acquisition_gnss_synchro;
+    unsigned int d_channel;
+    int d_last_seg;
+    long d_if_freq;
+    long d_fs_in;
+
+    bool d_aid_code_with_carrier;
+
+    float d_early_late_code_spc_cycles;
+    float d_very_early_late_code_spc_chips;
+    float d_very_early_late_code_spc_chips_prs;
+
+    LongCodeInterface_sptr d_prs_code_gen;
+    gr_complex* d_e1b_code;
+    gr_complex* d_prs_code;
+    std::vector< short > d_prs_code_shorts;
+    uint64_t d_start_index_prs_code;
+    unsigned int d_size_prs_code;
+    bool d_prs_code_initialized;
+
+
+    gr_complex* d_early_code;
+    gr_complex* d_prompt_code;
+    gr_complex* d_late_code;
+    gr_complex* d_very_early_code;
+    gr_complex* d_very_late_code;
+    gr_complex* d_carr_sign;
+
+
+    gr_complex* d_early_code_prs;
+    gr_complex* d_prompt_code_prs;
+    gr_complex* d_late_code_prs;
+    gr_complex* d_very_early_code_prs;
+    gr_complex* d_very_late_code_prs;
+
+    gr_complex *d_Very_Early;
+    gr_complex *d_Early;
+    gr_complex *d_Prompt;
+    gr_complex *d_Late;
+    gr_complex *d_Very_Late;
+
+    gr_complex *d_Very_Early_prs;
+    gr_complex *d_Early_prs;
+    gr_complex *d_Prompt_prs;
+    gr_complex *d_Late_prs;
+    gr_complex *d_Very_Late_prs;
+
+    // remaining code phase and carrier phase between tracking loops
+    double d_rem_code_phase_samples;
+    float d_rem_carr_phase_rad;
+
+    double d_rem_code_phase_samples_prs;
+    float d_rem_carr_phase_rad_prs;
+
+    // PLL and DLL filter library
+    Tracking_loop_filter d_code_loop_filter;
+    Tracking_loop_filter d_carrier_loop_filter;
+
+
+    int d_pll_loop_order;
+    float d_initial_pll_bw_hz;
+    float d_final_pll_bw_hz;
+
+    int d_dll_loop_order;
+    float d_initial_dll_bw_hz;
+    float d_final_dll_bw_hz;
+
+    float d_initial_early_late_code_space_cycles;
+    float d_final_early_late_code_space_cycles;
+
+    float d_initial_very_early_late_code_space_chips;
+    float d_final_very_early_late_code_space_chips;
+
+    Tracking_loop_filter d_code_loop_filter_prs;
+    Tracking_loop_filter d_carrier_loop_filter_prs;
+
+    // acquisition
+    float d_acq_code_phase_samples;
+    float d_acq_carrier_doppler_hz;
+
+    // correlator
+    Correlator d_correlator;
+
+    // tracking vars
+    double d_code_freq_chips;
+    double d_code_phase_chips;
+    float d_carrier_doppler_hz;
+    double d_carrier_phase_rad;
+    double d_acc_carrier_phase_rad;
+    double d_acc_code_phase_secs;
+
+    double d_code_freq_chips_prs;
+    double d_code_phase_chips_prs;
+    float d_carrier_doppler_hz_prs;
+    double d_carrier_phase_rad_prs;
+    double d_acc_carrier_phase_rad_prs;
+    double d_acc_code_phase_secs_prs;
+
+    //PRN period in samples
+    int d_current_prn_length_samples;
+
+    //processing samples counters
+    unsigned long int d_sample_counter;
+    unsigned long int d_acq_sample_stamp;
+
+    // CN0 estimation and lock detector
+    int d_cn0_estimation_counter;
+    gr_complex* d_Prompt_buffer;
+    float d_carrier_lock_test;
+    float d_CN0_SNV_dB_Hz;
+    float d_carrier_lock_threshold;
+    int d_carrier_lock_fail_counter;
+    int d_carrier_lock_success_counter;
+
+    // control vars
+    bool d_enable_tracking;
+    bool d_pull_in;
+
+    bool d_carrier_locked;
+    bool d_code_locked;
+    bool d_code_locked_prs;
+
+    bool d_tow_received;
+    double d_last_tow;
+    double d_timestamp_last_tow;
+
+    bool d_rx_time_set;
+    double d_tow_rx_time;
+    double d_timestamp_rx_time;
+
+    bool d_preamble_start_detected;
+    double d_preamble_timestamp;
+
+    bool d_prs_tracking_enabled;
+
+
+    // file dump
+    std::string d_dump_filename;
+    std::ofstream d_dump_file;
+
+    std::map<std::string, std::string> systemName;
+    std::string sys;
+
+    // Handler for gnss_messages:
+    void handle_gnss_message( pmt::pmt_t msg );
+};
+
+#endif //GNSS_SDR_GALILEO_E1_PRS_VEML_TRACKING_CC_H
+

src/core/receiver/gnss_block_factory.cc

@@ -89,6 +89,7 @@
 #include "gps_l2_m_dll_pll_tracking.h"
 #include "galileo_e1_de_tracking.h"
 #include "galileo_e1_prs_de_tracking.h"
+#include "galileo_e1_prs_veml_tracking.h"
 #include "gps_l1_ca_telemetry_decoder.h"
 #include "gps_l2_m_telemetry_decoder.h"
 #include "galileo_e1b_telemetry_decoder.h"
@@ -1657,6 +1658,12 @@ std::unique_ptr<TrackingInterface> GNSSBlockFactory::GetTrkBlock(
                     out_streams, queue));
             block = std::move(block_);
         }
+    else if (implementation.compare("Galileo_E1_PRS_VEML_Tracking") == 0)
+        {
+            std::unique_ptr<TrackingInterface> block_(new GalileoE1PrsVemlTracking(configuration.get(), role, in_streams,
+                    out_streams, queue));
+            block = std::move(block_);
+        }
 #if CUDA_GPU_ACCEL
     else if (implementation.compare("GPS_L1_CA_DLL_PLL_Tracking_GPU") == 0)
         {