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/*!
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* \ file gps_l2_m_dll_pll_tracking_fpga . cc
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* \ brief Implementation of an adapter of a DLL + PLL tracking loop block
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* for GPS L2C to a TrackingInterface for the FPGA
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* \ author Javier Arribas , 2019. jarribas ( at ) cttc . es
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*
* 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
*
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
*
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* Copyright ( C ) 2010 - 2019 ( see AUTHORS file for a list of contributors )
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*
* 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
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* along with GNSS - SDR . If not , see < https : //www.gnu.org/licenses/>.
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*
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
*/
# include "gps_l2_m_dll_pll_tracking_fpga.h"
# include "GPS_L2C.h"
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# include "configuration_interface.h"
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# include "display.h"
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# include "dll_pll_conf_fpga.h"
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# include "gnss_sdr_flags.h"
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# include "gnss_synchro.h"
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# include "gps_l2c_signal.h"
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# include <glog/logging.h>
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# include <volk_gnsssdr/volk_gnsssdr_alloc.h>
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# include <array>
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# include <cmath> // for round
# include <cstring> // for memcpy
# include <iostream>
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GpsL2MDllPllTrackingFpga : : GpsL2MDllPllTrackingFpga (
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ConfigurationInterface * configuration , const 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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Dll_Pll_Conf_Fpga trk_param_fpga = Dll_Pll_Conf_Fpga ( ) ;
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DLOG ( INFO ) < < " role " < < role ;
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// ################# CONFIGURATION PARAMETERS ########################
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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 ;
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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 ;
bool dump_mat = configuration - > property ( role + " .dump_mat " , true ) ;
trk_param_fpga . dump_mat = dump_mat ;
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float pll_bw_hz = configuration - > property ( role + " .pll_bw_hz " , 2.0 ) ;
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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_fpga . pll_bw_hz = pll_bw_hz ;
float dll_bw_hz = configuration - > property ( role + " .dll_bw_hz " , 0.75 ) ;
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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_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 ;
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int vector_length = std : : round ( static_cast < double > ( fs_in ) / ( static_cast < double > ( GPS_L2_M_CODE_RATE_CPS ) / static_cast < double > ( GPS_L2_M_CODE_LENGTH_CHIPS ) ) ) ;
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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 ' ;
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std : : array < char , 3 > sig_ { ' 2 ' , ' S ' , ' \0 ' } ;
std : : memcpy ( trk_param_fpga . signal , sig_ . data ( ) , 3 ) ;
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trk_param_fpga . cn0_samples = configuration - > property ( role + " .cn0_samples " , trk_param_fpga . cn0_samples ) ;
trk_param_fpga . cn0_min = configuration - > property ( role + " .cn0_min " , trk_param_fpga . cn0_min ) ;
trk_param_fpga . max_code_lock_fail = configuration - > property ( role + " .max_lock_fail " , trk_param_fpga . max_code_lock_fail ) ;
trk_param_fpga . max_carrier_lock_fail = configuration - > property ( role + " .max_carrier_lock_fail " , trk_param_fpga . max_carrier_lock_fail ) ;
trk_param_fpga . carrier_lock_th = configuration - > property ( role + " .carrier_lock_th " , trk_param_fpga . carrier_lock_th ) ;
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trk_param_fpga . cn0_smoother_samples = configuration - > property ( role + " .cn0_smoother_samples " , trk_param_fpga . cn0_smoother_samples ) ;
trk_param_fpga . cn0_smoother_alpha = configuration - > property ( role + " .cn0_smoother_alpha " , trk_param_fpga . cn0_smoother_alpha ) ;
trk_param_fpga . carrier_lock_test_smoother_samples = configuration - > property ( role + " .carrier_lock_test_smoother_samples " , trk_param_fpga . carrier_lock_test_smoother_samples ) ;
trk_param_fpga . carrier_lock_test_smoother_alpha = configuration - > property ( role + " .carrier_lock_test_smoother_alpha " , trk_param_fpga . carrier_lock_test_smoother_alpha ) ;
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// 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 ;
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// obtain the number of the first uio device file that is assigned to the FPGA L2 tracking multicorrelator HW accelerators
trk_param_fpga . dev_file_num = configuration - > property ( role + " .dev_file_num " , 27 ) ;
// compute the number of tracking channels that have already been instantiated. The order in which
// GNSS-SDR instantiates the tracking channels i L1, L2, L5, E1, E5a
trk_param_fpga . num_prev_assigned_ch = configuration - > property ( " Channels_1C.count " , 0 ) ;
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volk_gnsssdr : : vector < float > ca_codes_f ( static_cast < unsigned int > ( GPS_L2_M_CODE_LENGTH_CHIPS ) , 0.0 ) ;
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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 ( uint32_t PRN = 1 ; PRN < = NUM_PRNs ; PRN + + )
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{
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gps_l2c_m_code_gen_float ( ca_codes_f , PRN ) ;
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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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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 GNU Radio object ###################
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tracking_fpga_sc = dll_pll_veml_make_tracking_fpga ( trk_param_fpga ) ;
channel_ = 0 ;
DLOG ( INFO ) < < " tracking( " < < tracking_fpga_sc - > unique_id ( ) < < " ) " ;
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if ( in_streams_ > 1 )
{
LOG ( ERROR ) < < " This implementation only supports one input stream " ;
}
if ( out_streams_ > 1 )
{
LOG ( ERROR ) < < " This implementation only supports one output stream " ;
}
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}
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GpsL2MDllPllTrackingFpga : : ~ GpsL2MDllPllTrackingFpga ( )
{
volk_gnsssdr_free ( d_ca_codes ) ;
}
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void GpsL2MDllPllTrackingFpga : : start_tracking ( )
{
tracking_fpga_sc - > start_tracking ( ) ;
}
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void GpsL2MDllPllTrackingFpga : : stop_tracking ( )
{
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tracking_fpga_sc - > stop_tracking ( ) ;
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}
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/*
* Set tracking channel unique ID
*/
void GpsL2MDllPllTrackingFpga : : set_channel ( unsigned int channel )
{
channel_ = channel ;
tracking_fpga_sc - > set_channel ( channel ) ;
}
void GpsL2MDllPllTrackingFpga : : set_gnss_synchro ( 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 */
} ;
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// nothing to connect
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}
void GpsL2MDllPllTrackingFpga : : disconnect ( gr : : top_block_sptr top_block )
{
if ( top_block )
{ /* top_block is not null */
} ;
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// nothing to disconnect
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}
gr : : basic_block_sptr GpsL2MDllPllTrackingFpga : : get_left_block ( )
{
return tracking_fpga_sc ;
}
gr : : basic_block_sptr GpsL2MDllPllTrackingFpga : : get_right_block ( )
{
return tracking_fpga_sc ;
}