2018-05-22 10:25:14 +00:00
/*!
2019-02-26 17:28:14 +00:00
* \ file galileo_e1_pcps_ambiguous_acquisition_fpga . cc
2018-05-22 10:25:14 +00:00
* \ brief Adapts a PCPS acquisition block to an AcquisitionInterface for
2019-02-26 17:28:14 +00:00
* Galileo E1 Signals for the FPGA
* \ author Marc Majoral , 2019. mmajoral ( at ) cttc . es
2018-05-22 10:25:14 +00:00
*
2020-07-28 14:57:15 +00:00
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2018-05-22 10:25:14 +00:00
*
2020-12-30 12:35:06 +00:00
* GNSS - SDR is a Global Navigation Satellite System software - defined receiver .
2018-05-22 10:25:14 +00:00
* This file is part of GNSS - SDR .
*
2022-07-12 10:40:56 +00:00
* Copyright ( C ) 2010 - 2022 ( see AUTHORS file for a list of contributors )
2020-02-08 00:20:02 +00:00
* SPDX - License - Identifier : GPL - 3.0 - or - later
2018-05-22 10:25:14 +00:00
*
2020-07-28 14:57:15 +00:00
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2019-02-27 16:27:31 +00:00
*/
2018-05-22 10:25:14 +00:00
# include "galileo_e1_pcps_ambiguous_acquisition_fpga.h"
2018-12-09 21:00:09 +00:00
# include "Galileo_E1.h"
2018-05-22 10:25:14 +00:00
# include "configuration_interface.h"
2020-11-07 21:43:19 +00:00
# include "galileo_e1_signal_replica.h"
2021-01-15 12:39:26 +00:00
# include "gnss_sdr_fft.h"
2018-05-22 10:25:14 +00:00
# include "gnss_sdr_flags.h"
# include <glog/logging.h>
2019-03-06 12:49:14 +00:00
# include <gnuradio/fft/fft.h> // for fft_complex
# include <gnuradio/gr_complex.h> // for gr_complex
# include <volk/volk.h> // for volk_32fc_conjugate_32fc
2019-10-27 20:34:19 +00:00
# include <volk_gnsssdr/volk_gnsssdr_alloc.h>
2019-06-29 09:58:08 +00:00
# include <algorithm> // for copy_n
# include <cmath> // for abs, pow, floor
# include <complex> // for complex
2018-05-22 10:25:14 +00:00
GalileoE1PcpsAmbiguousAcquisitionFpga : : GalileoE1PcpsAmbiguousAcquisitionFpga (
2020-06-29 07:07:41 +00:00
const ConfigurationInterface * configuration ,
2018-12-02 04:29:11 +00:00
const std : : string & role ,
unsigned int in_streams ,
2022-12-09 11:00:28 +00:00
unsigned int out_streams )
: gnss_synchro_ ( nullptr ) ,
role_ ( role ) ,
doppler_center_ ( 0 ) ,
channel_ ( 0 ) ,
doppler_step_ ( 0 ) ,
in_streams_ ( in_streams ) ,
out_streams_ ( out_streams ) ,
acquire_pilot_ ( configuration - > property ( role + " .acquire_pilot " , false ) )
2018-05-22 10:25:14 +00:00
{
2023-12-20 15:32:40 +00:00
acq_parameters_ . SetFromConfiguration ( configuration , role_ , fpga_buff_num , fpga_blk_exp , downsampling_factor_default , GALILEO_E1_CODE_CHIP_RATE_CPS , GALILEO_E1_B_CODE_LENGTH_CHIPS ) ;
2018-05-22 10:25:14 +00:00
2019-10-11 17:24:20 +00:00
if ( FLAGS_doppler_max ! = 0 )
{
2022-07-12 10:40:56 +00:00
acq_parameters_ . doppler_max = FLAGS_doppler_max ;
2019-10-11 17:24:20 +00:00
}
2022-07-12 10:40:56 +00:00
doppler_max_ = acq_parameters_ . doppler_max ;
2022-12-10 07:55:17 +00:00
doppler_step_ = static_cast < unsigned int > ( acq_parameters_ . doppler_step ) ;
fs_in_ = acq_parameters_ . fs_in ;
2018-05-22 10:25:14 +00:00
2022-07-12 10:40:56 +00:00
uint32_t code_length = acq_parameters_ . code_length ;
uint32_t nsamples_total = acq_parameters_ . samples_per_code ;
2018-05-22 10:25:14 +00:00
2019-02-26 17:28:14 +00:00
// compute all the GALILEO E1 PRN Codes (this is done only once in the class constructor in order to avoid re-computing the PRN codes every time
2018-05-22 10:25:14 +00:00
// a channel is assigned)
2021-01-15 12:39:26 +00:00
auto fft_if = gnss_fft_fwd_make_unique ( nsamples_total ) ; // Direct FFT
volk_gnsssdr : : vector < std : : complex < float > > code ( nsamples_total ) ; // buffer for the local code
2019-10-27 20:34:19 +00:00
volk_gnsssdr : : vector < gr_complex > fft_codes_padded ( nsamples_total ) ;
2021-10-11 16:31:16 +00:00
d_all_fft_codes_ = volk_gnsssdr : : vector < uint32_t > ( nsamples_total * GALILEO_E1_NUMBER_OF_CODES ) ; // memory containing all the possible fft codes for PRN 0 to 32
2019-06-30 10:10:14 +00:00
float max ; // temporary maxima search
2019-08-12 22:19:31 +00:00
int32_t tmp ;
int32_t tmp2 ;
int32_t local_code ;
int32_t fft_data ;
2018-05-22 10:25:14 +00:00
2019-02-27 13:37:07 +00:00
for ( uint32_t PRN = 1 ; PRN < = GALILEO_E1_NUMBER_OF_CODES ; PRN + + )
2018-05-22 10:25:14 +00:00
{
2019-02-27 16:27:31 +00:00
bool cboc = false ; // cboc is set to 0 when using the FPGA
if ( acquire_pilot_ = = true )
{
2019-07-27 09:22:08 +00:00
// set local signal generator to Galileo E1 pilot component (1C)
2019-06-28 23:28:30 +00:00
std : : array < char , 3 > pilot_signal = { { ' 1 ' , ' C ' , ' \0 ' } } ;
2019-07-27 09:22:08 +00:00
galileo_e1_code_gen_complex_sampled ( code , pilot_signal ,
2022-07-12 10:40:56 +00:00
cboc , PRN , fs_in_ , 0 , false ) ;
2019-02-27 16:27:31 +00:00
}
else
{
2019-06-28 23:28:30 +00:00
std : : array < char , 3 > data_signal = { { ' 1 ' , ' B ' , ' \0 ' } } ;
2019-07-27 09:22:08 +00:00
galileo_e1_code_gen_complex_sampled ( code , data_signal ,
2022-07-12 10:40:56 +00:00
cboc , PRN , fs_in_ , 0 , false ) ;
2019-02-27 16:27:31 +00:00
}
for ( uint32_t s = code_length ; s < 2 * code_length ; s + + )
{
code [ s ] = code [ s - code_length ] ;
}
// fill in zero padding
for ( uint32_t s = 2 * code_length ; s < nsamples_total ; s + + )
{
2018-12-10 18:05:12 +00:00
code [ s ] = std : : complex < float > ( 0.0 , 0.0 ) ;
2019-02-27 16:27:31 +00:00
}
2019-10-27 20:34:19 +00:00
std : : copy_n ( code . data ( ) , nsamples_total , fft_if - > get_inbuf ( ) ) ; // copy to FFT buffer
fft_if - > execute ( ) ; // Run the FFT of local code
volk_32fc_conjugate_32fc ( fft_codes_padded . data ( ) , fft_if - > get_outbuf ( ) , nsamples_total ) ; // conjugate values
2019-02-27 16:27:31 +00:00
// normalize the code
max = 0 ; // initialize maximum value
for ( uint32_t i = 0 ; i < nsamples_total ; i + + ) // search for maxima
{
if ( std : : abs ( fft_codes_padded [ i ] . real ( ) ) > max )
{
max = std : : abs ( fft_codes_padded [ i ] . real ( ) ) ;
}
if ( std : : abs ( fft_codes_padded [ i ] . imag ( ) ) > max )
{
max = std : : abs ( fft_codes_padded [ i ] . imag ( ) ) ;
}
}
2019-03-26 11:26:08 +00:00
// map the FFT to the dynamic range of the fixed point values an copy to buffer containing all FFTs
// and package codes in a format that is ready to be written to the FPGA
for ( uint32_t i = 0 ; i < nsamples_total ; i + + )
2019-02-27 16:27:31 +00:00
{
2019-07-22 17:58:37 +00:00
tmp = static_cast < int32_t > ( floor ( fft_codes_padded [ i ] . real ( ) * ( pow ( 2 , quant_bits_local_code - 1 ) - 1 ) / max ) ) ;
tmp2 = static_cast < int32_t > ( floor ( fft_codes_padded [ i ] . imag ( ) * ( pow ( 2 , quant_bits_local_code - 1 ) - 1 ) / max ) ) ;
local_code = ( tmp & select_lsbits ) | ( ( tmp2 * shl_code_bits ) & select_msbits ) ; // put together the real part and the imaginary part
fft_data = local_code & select_all_code_bits ;
2019-03-26 11:26:08 +00:00
d_all_fft_codes_ [ i + ( nsamples_total * ( PRN - 1 ) ) ] = fft_data ;
2019-02-27 16:27:31 +00:00
}
2018-05-22 10:25:14 +00:00
}
2022-07-12 10:40:56 +00:00
acq_parameters_ . all_fft_codes = d_all_fft_codes_ . data ( ) ;
2018-10-31 17:48:08 +00:00
2022-12-09 11:00:28 +00:00
DLOG ( INFO ) < < " role " < < role_ ;
2022-07-12 10:40:56 +00:00
acquisition_fpga_ = pcps_make_acquisition_fpga ( acq_parameters_ ) ;
2018-05-22 10:25:14 +00:00
2019-08-13 19:26:36 +00:00
if ( in_streams_ > 1 )
{
LOG ( ERROR ) < < " This implementation only supports one input stream " ;
}
if ( out_streams_ > 0 )
{
LOG ( ERROR ) < < " This implementation does not provide an output stream " ;
}
2018-05-22 10:25:14 +00:00
}
2018-12-02 04:29:11 +00:00
void GalileoE1PcpsAmbiguousAcquisitionFpga : : stop_acquisition ( )
{
2021-05-06 18:38:22 +00:00
// stop the acquisition and the other FPGA modules.
acquisition_fpga_ - > stop_acquisition ( ) ;
2018-12-02 04:29:11 +00:00
}
2018-05-22 10:25:14 +00:00
void GalileoE1PcpsAmbiguousAcquisitionFpga : : set_threshold ( float threshold )
{
DLOG ( INFO ) < < " Channel " < < channel_ < < " Threshold = " < < threshold ;
acquisition_fpga_ - > set_threshold ( threshold ) ;
}
void GalileoE1PcpsAmbiguousAcquisitionFpga : : set_doppler_max ( unsigned int doppler_max )
{
doppler_max_ = doppler_max ;
acquisition_fpga_ - > set_doppler_max ( doppler_max_ ) ;
}
void GalileoE1PcpsAmbiguousAcquisitionFpga : : set_doppler_step ( unsigned int doppler_step )
{
doppler_step_ = doppler_step ;
acquisition_fpga_ - > set_doppler_step ( doppler_step_ ) ;
}
2019-07-27 09:22:08 +00:00
2019-07-24 11:02:14 +00:00
void GalileoE1PcpsAmbiguousAcquisitionFpga : : set_doppler_center ( int doppler_center )
{
doppler_center_ = doppler_center ;
acquisition_fpga_ - > set_doppler_center ( doppler_center_ ) ;
}
2018-05-22 10:25:14 +00:00
2019-07-27 09:22:08 +00:00
2018-05-22 10:25:14 +00:00
void GalileoE1PcpsAmbiguousAcquisitionFpga : : set_gnss_synchro ( Gnss_Synchro * gnss_synchro )
{
gnss_synchro_ = gnss_synchro ;
acquisition_fpga_ - > set_gnss_synchro ( gnss_synchro_ ) ;
}
signed int GalileoE1PcpsAmbiguousAcquisitionFpga : : mag ( )
{
return acquisition_fpga_ - > mag ( ) ;
}
void GalileoE1PcpsAmbiguousAcquisitionFpga : : init ( )
{
acquisition_fpga_ - > init ( ) ;
}
void GalileoE1PcpsAmbiguousAcquisitionFpga : : set_local_code ( )
{
acquisition_fpga_ - > set_local_code ( ) ;
}
void GalileoE1PcpsAmbiguousAcquisitionFpga : : reset ( )
{
2019-02-26 17:28:14 +00:00
// This command starts the acquisition process
2018-05-22 10:25:14 +00:00
acquisition_fpga_ - > set_active ( true ) ;
}
void GalileoE1PcpsAmbiguousAcquisitionFpga : : set_state ( int state )
{
acquisition_fpga_ - > set_state ( state ) ;
2018-09-12 14:02:23 +00:00
}
2018-05-22 10:25:14 +00:00
2019-03-06 20:54:39 +00:00
2018-05-22 10:25:14 +00:00
void GalileoE1PcpsAmbiguousAcquisitionFpga : : connect ( gr : : top_block_sptr top_block )
{
2019-02-28 20:45:30 +00:00
if ( top_block )
{ /* top_block is not null */
} ;
// Nothing to connect
2018-05-22 10:25:14 +00:00
}
void GalileoE1PcpsAmbiguousAcquisitionFpga : : disconnect ( gr : : top_block_sptr top_block )
{
2019-02-28 20:45:30 +00:00
if ( top_block )
{ /* top_block is not null */
} ;
// Nothing to disconnect
2018-05-22 10:25:14 +00:00
}
gr : : basic_block_sptr GalileoE1PcpsAmbiguousAcquisitionFpga : : get_left_block ( )
{
2018-10-28 10:07:53 +00:00
return nullptr ;
2018-05-22 10:25:14 +00:00
}
gr : : basic_block_sptr GalileoE1PcpsAmbiguousAcquisitionFpga : : get_right_block ( )
{
2019-03-20 15:57:50 +00:00
return nullptr ;
2018-05-22 10:25:14 +00:00
}