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/*!
* \ file gps_l2_m_dll_pll_tracking . cc
* \ brief Implementation of an adapter of a DLL + PLL tracking loop block
* for GPS L1 C / A to a TrackingInterface
* \ author Javier Arribas , 2015. jarribas ( at ) cttc . es
*
* 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
*
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
*
* 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 "gps_l2_m_dll_pll_tracking_fpga.h"
# include "configuration_interface.h"
# include "GPS_L2C.h"
# include "gps_l2c_signal.h"
# include "gnss_sdr_flags.h"
# include "display.h"
# include <glog/logging.h>
# define NUM_PRNs 32
using google : : LogMessage ;
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void GpsL2MDllPllTrackingFpga : : stop_tracking ( )
{
}
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GpsL2MDllPllTrackingFpga : : GpsL2MDllPllTrackingFpga (
ConfigurationInterface * configuration , std : : string role ,
unsigned int in_streams , unsigned int out_streams ) : role_ ( role ) , in_streams_ ( in_streams ) , out_streams_ ( out_streams )
{
//dllpllconf_t trk_param;
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Dll_Pll_Conf_Fpga trk_param_fpga = Dll_Pll_Conf_Fpga ( ) ;
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DLOG ( INFO ) < < " role " < < role ;
//################# CONFIGURATION PARAMETERS ########################
//std::string default_item_type = "gr_complex";
//std::string item_type = configuration->property(role + ".item_type", default_item_type);
int fs_in_deprecated = configuration - > property ( " GNSS-SDR.internal_fs_hz " , 2048000 ) ;
int fs_in = configuration - > property ( " GNSS-SDR.internal_fs_sps " , fs_in_deprecated ) ;
trk_param_fpga . fs_in = fs_in ;
bool dump = configuration - > property ( role + " .dump " , false ) ;
trk_param_fpga . dump = dump ;
float pll_bw_hz = configuration - > property ( role + " .pll_bw_hz " , 2.0 ) ;
if ( FLAGS_pll_bw_hz ! = 0.0 ) pll_bw_hz = static_cast < float > ( FLAGS_pll_bw_hz ) ;
trk_param_fpga . pll_bw_hz = pll_bw_hz ;
float dll_bw_hz = configuration - > property ( role + " .dll_bw_hz " , 0.75 ) ;
if ( FLAGS_dll_bw_hz ! = 0.0 ) dll_bw_hz = static_cast < float > ( FLAGS_dll_bw_hz ) ;
trk_param_fpga . dll_bw_hz = dll_bw_hz ;
float early_late_space_chips = configuration - > property ( role + " .early_late_space_chips " , 0.5 ) ;
trk_param_fpga . early_late_space_chips = early_late_space_chips ;
trk_param_fpga . early_late_space_narrow_chips = 0.0 ;
std : : string default_dump_filename = " ./track_ch " ;
std : : string dump_filename = configuration - > property ( role + " .dump_filename " , default_dump_filename ) ;
trk_param_fpga . dump_filename = dump_filename ;
int vector_length = std : : round ( static_cast < double > ( fs_in ) / ( static_cast < double > ( GPS_L2_M_CODE_RATE_HZ ) / static_cast < double > ( GPS_L2_M_CODE_LENGTH_CHIPS ) ) ) ;
trk_param_fpga . vector_length = vector_length ;
int symbols_extended_correlator = configuration - > property ( role + " .extend_correlation_symbols " , 1 ) ;
if ( symbols_extended_correlator ! = 1 )
{
std : : cout < < TEXT_RED < < " WARNING: Extended coherent integration is not allowed in GPS L2. Coherent integration has been set to 20 ms (1 symbol) " < < TEXT_RESET < < std : : endl ;
}
trk_param_fpga . extend_correlation_symbols = 1 ;
bool track_pilot = configuration - > property ( role + " .track_pilot " , false ) ;
if ( track_pilot )
{
std : : cout < < TEXT_RED < < " WARNING: GPS L2 does not have pilot signal. Data tracking has been enabled " < < TEXT_RESET < < std : : endl ;
}
trk_param_fpga . track_pilot = false ;
trk_param_fpga . very_early_late_space_chips = 0.0 ;
trk_param_fpga . very_early_late_space_narrow_chips = 0.0 ;
trk_param_fpga . pll_bw_narrow_hz = 0.0 ;
trk_param_fpga . dll_bw_narrow_hz = 0.0 ;
trk_param_fpga . system = ' G ' ;
char sig_ [ 3 ] = " 2S " ;
std : : memcpy ( trk_param_fpga . signal , sig_ , 3 ) ;
int cn0_samples = configuration - > property ( role + " .cn0_samples " , 20 ) ;
if ( FLAGS_cn0_samples ! = 20 ) cn0_samples = FLAGS_cn0_samples ;
trk_param_fpga . cn0_samples = cn0_samples ;
int cn0_min = configuration - > property ( role + " .cn0_min " , 25 ) ;
if ( FLAGS_cn0_min ! = 25 ) cn0_min = FLAGS_cn0_min ;
trk_param_fpga . cn0_min = cn0_min ;
int max_lock_fail = configuration - > property ( role + " .max_lock_fail " , 50 ) ;
if ( FLAGS_max_lock_fail ! = 50 ) max_lock_fail = FLAGS_max_lock_fail ;
trk_param_fpga . max_lock_fail = max_lock_fail ;
double carrier_lock_th = configuration - > property ( role + " .carrier_lock_th " , 0.85 ) ;
if ( FLAGS_carrier_lock_th ! = 0.85 ) carrier_lock_th = FLAGS_carrier_lock_th ;
trk_param_fpga . carrier_lock_th = carrier_lock_th ;
// FPGA configuration parameters
std : : string default_device_name = " /dev/uio " ;
std : : string device_name = configuration - > property ( role + " .devicename " , default_device_name ) ;
trk_param_fpga . device_name = device_name ;
unsigned int device_base = configuration - > property ( role + " .device_base " , 1 ) ;
trk_param_fpga . device_base = device_base ;
//unsigned int multicorr_type = configuration->property(role + ".multicorr_type", 0);
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trk_param_fpga . multicorr_type = 0 ; //multicorr_type : 0 -> 3 correlators, 1 -> 5 correlators
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//d_tracking_code = static_cast<float *>(volk_gnsssdr_malloc(2 * static_cast<unsigned int>(GPS_L2_M_CODE_LENGTH_CHIPS) * sizeof(float), volk_gnsssdr_get_alignment()));
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d_ca_codes = static_cast < int * > ( volk_gnsssdr_malloc ( static_cast < unsigned int > ( GPS_L2_M_CODE_LENGTH_CHIPS ) * NUM_PRNs * sizeof ( int ) , volk_gnsssdr_get_alignment ( ) ) ) ;
float * ca_codes_f = static_cast < float * > ( volk_gnsssdr_malloc ( static_cast < unsigned int > ( GPS_L2_M_CODE_LENGTH_CHIPS ) * sizeof ( float ) , volk_gnsssdr_get_alignment ( ) ) ) ;
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//################# PRE-COMPUTE ALL THE CODES #################
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d_ca_codes = static_cast < int * > ( volk_gnsssdr_malloc ( static_cast < int > ( GPS_L2_M_CODE_LENGTH_CHIPS * NUM_PRNs ) * sizeof ( int ) , volk_gnsssdr_get_alignment ( ) ) ) ;
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for ( unsigned int PRN = 1 ; PRN < = NUM_PRNs ; PRN + + )
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{
//gps_l1_ca_code_gen_int(&d_ca_codes[(int(GPS_L1_CA_CODE_LENGTH_CHIPS)) * (PRN - 1)], PRN, 0);
gps_l2c_m_code_gen_float ( ca_codes_f , PRN ) ;
for ( unsigned int s = 0 ; s < 2 * static_cast < unsigned int > ( GPS_L2_M_CODE_LENGTH_CHIPS ) ; s + + )
{
d_ca_codes [ static_cast < int > ( GPS_L2_M_CODE_LENGTH_CHIPS ) * ( PRN - 1 ) + s ] = static_cast < int > ( ca_codes_f [ s ] ) ;
}
}
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delete [ ] ca_codes_f ;
trk_param_fpga . ca_codes = d_ca_codes ;
trk_param_fpga . code_length_chips = GPS_L2_M_CODE_LENGTH_CHIPS ;
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trk_param_fpga . code_samples_per_chip = 1 ; // 1 sample per chip
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//################# MAKE TRACKING GNURadio object ###################
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// //################# MAKE TRACKING GNURadio object ###################
// if (item_type.compare("gr_complex") == 0)
// {
// item_size_ = sizeof(gr_complex);
// tracking_ = dll_pll_veml_make_tracking(trk_param);
// }
// else
// {
// item_size_ = sizeof(gr_complex);
// LOG(WARNING) << item_type << " unknown tracking item type.";
// }
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//################# MAKE TRACKING GNURadio object ###################
tracking_fpga_sc = dll_pll_veml_make_tracking_fpga ( trk_param_fpga ) ;
channel_ = 0 ;
DLOG ( INFO ) < < " tracking( " < < tracking_fpga_sc - > unique_id ( ) < < " ) " ;
}
GpsL2MDllPllTrackingFpga : : ~ GpsL2MDllPllTrackingFpga ( )
{
}
void GpsL2MDllPllTrackingFpga : : start_tracking ( )
{
//tracking_->start_tracking();
tracking_fpga_sc - > start_tracking ( ) ;
}
/*
* Set tracking channel unique ID
*/
void GpsL2MDllPllTrackingFpga : : set_channel ( unsigned int channel )
{
channel_ = channel ;
//tracking_->set_channel(channel);
tracking_fpga_sc - > set_channel ( channel ) ;
}
void GpsL2MDllPllTrackingFpga : : set_gnss_synchro ( Gnss_Synchro * p_gnss_synchro )
{
//tracking_->set_gnss_synchro(p_gnss_synchro);
tracking_fpga_sc - > set_gnss_synchro ( p_gnss_synchro ) ;
}
void GpsL2MDllPllTrackingFpga : : 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 GpsL2MDllPllTrackingFpga : : 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 GpsL2MDllPllTrackingFpga : : get_left_block ( )
{
//return tracking_;
return tracking_fpga_sc ;
}
gr : : basic_block_sptr GpsL2MDllPllTrackingFpga : : get_right_block ( )
{
//return tracking_;
return tracking_fpga_sc ;
}