mirror of https://github.com/gnss-sdr/gnss-sdr
287 lines
9.6 KiB
C++
287 lines
9.6 KiB
C++
/*!
|
|
* \file gps_l1_ca_gps_sdr_acquisition_ss.cc
|
|
* \brief Brief description of the file here
|
|
* \author Carlos Aviles, 2010. carlos.avilesr(at)googlemail.com
|
|
* Luis Esteve, 2011. luis(at)epsilon-formacion.com
|
|
*
|
|
* Detailed description of the file here if needed.
|
|
*
|
|
* -------------------------------------------------------------------------
|
|
*
|
|
* Copyright (C) 2010-2011 (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_l1_ca_gps_sdr_acquisition_ss.h"
|
|
#include "gps_sdr_fft.h"
|
|
#include "gps_sdr_prn_codes_short.h"
|
|
#include "control_message_factory.h"
|
|
#include "gps_sdr_x86.h"
|
|
#ifndef NO_SIMD
|
|
#include "gps_sdr_simd.h"
|
|
#endif
|
|
#include <gnuradio/gr_io_signature.h>
|
|
|
|
#include <sstream>
|
|
|
|
#include <glog/log_severity.h>
|
|
#include <glog/logging.h>
|
|
|
|
using google::LogMessage;
|
|
|
|
gps_l1_ca_gps_sdr_acquisition_ss_sptr gps_l1_ca_gps_sdr_make_acquisition_ss(
|
|
unsigned int sampled_ms, long freq, long fs_in, int samples_per_ms,
|
|
gr_msg_queue_sptr queue, bool dump, std::string dump_filename)
|
|
{
|
|
|
|
return gps_l1_ca_gps_sdr_acquisition_ss_sptr(
|
|
new gps_l1_ca_gps_sdr_acquisition_ss(sampled_ms, freq, fs_in,
|
|
samples_per_ms, queue, dump, dump_filename));
|
|
}
|
|
|
|
gps_l1_ca_gps_sdr_acquisition_ss::gps_l1_ca_gps_sdr_acquisition_ss(
|
|
unsigned int sampled_ms, long freq, long fs_in, int samples_per_ms,
|
|
gr_msg_queue_sptr queue, bool dump, std::string dump_filename) :
|
|
gr_block("gps_l1_ca_gps_sdr_acquisition_ss", gr_make_io_signature(1, 1,
|
|
sizeof(short) * 2 * samples_per_ms), gr_make_io_signature(0, 0,
|
|
sizeof(short) * 2 * samples_per_ms))
|
|
{
|
|
|
|
// SAMPLE COUNTER
|
|
d_sample_counter = 0;
|
|
|
|
d_active = false;
|
|
d_dump = dump;
|
|
d_queue = queue;
|
|
d_dump_filename = dump_filename;
|
|
|
|
d_fs_in = fs_in;
|
|
d_samples_per_ms = samples_per_ms;
|
|
d_doppler_resolution = 4;
|
|
d_freq = freq;
|
|
d_satellite = 0;
|
|
d_doppler_max = 0;
|
|
d_sampled_ms = sampled_ms;
|
|
d_fft_size = d_sampled_ms * d_samples_per_ms;
|
|
|
|
d_doppler_freq_shift = 0.0;
|
|
d_prn_code_phase = 0;
|
|
d_mag = 0;
|
|
|
|
d_sine_if = new CPX[d_fft_size];
|
|
d_sine_250 = new CPX[d_fft_size];
|
|
d_sine_500 = new CPX[d_fft_size];
|
|
d_sine_750 = new CPX[d_fft_size];
|
|
|
|
d_baseband_signal = new CPX[d_doppler_resolution * d_fft_size];
|
|
d_baseband_signal_shift = new CPX[d_doppler_resolution * (d_fft_size
|
|
+ 201)];
|
|
|
|
signed int R1[16] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
|
|
d_pFFT = new FFT(d_fft_size, R1);
|
|
|
|
signed int R2[16] = { 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1 };
|
|
d_piFFT = new FFT(d_fft_size, R2);
|
|
|
|
for (int i = 0; i < 32; i++)
|
|
{
|
|
d_fft_codes[i] = (CPX *)&PRN_Codes_Short[sizeof(short) * i
|
|
* d_samples_per_ms];
|
|
}
|
|
|
|
sine_gen(d_sine_if, -d_freq, d_fs_in, d_fft_size);
|
|
sine_gen(d_sine_250, -d_freq - 250, d_fs_in, d_fft_size);
|
|
sine_gen(d_sine_500, -d_freq - 500, d_fs_in, d_fft_size);
|
|
sine_gen(d_sine_750, -d_freq - 750, d_fs_in, d_fft_size);
|
|
|
|
DLOG(INFO) << "fs in " << d_fs_in;
|
|
DLOG(INFO) << "samples per ms " << d_samples_per_ms;
|
|
DLOG(INFO) << "doppler resolution " << d_doppler_resolution;
|
|
DLOG(INFO) << "freq " << d_freq;
|
|
DLOG(INFO) << "satellite " << d_satellite;
|
|
DLOG(INFO) << "sampled_ms " << d_sampled_ms;
|
|
DLOG(INFO) << "fft_size " << d_fft_size;
|
|
DLOG(INFO) << "dump filename " << d_dump_filename;
|
|
DLOG(INFO) << "dump " << d_dump;
|
|
}
|
|
|
|
gps_l1_ca_gps_sdr_acquisition_ss::~gps_l1_ca_gps_sdr_acquisition_ss()
|
|
{
|
|
delete[] d_baseband_signal;
|
|
delete[] d_baseband_signal_shift;
|
|
delete[] d_sine_if;
|
|
delete[] d_sine_250;
|
|
delete[] d_sine_500;
|
|
delete[] d_sine_750;
|
|
delete d_pFFT;
|
|
delete d_piFFT;
|
|
|
|
if (d_dump)
|
|
{
|
|
d_dump_file.close();
|
|
}
|
|
}
|
|
|
|
void gps_l1_ca_gps_sdr_acquisition_ss::set_satellite(unsigned int satellite)
|
|
{
|
|
d_satellite = satellite;
|
|
d_prn_code_phase = 0;
|
|
d_doppler_freq_shift = 0;
|
|
d_mag = 0;
|
|
DLOG(INFO) << "satellite set to " << d_satellite;
|
|
}
|
|
|
|
signed int gps_l1_ca_gps_sdr_acquisition_ss::prn_code_phase()
|
|
{
|
|
return d_prn_code_phase;
|
|
}
|
|
|
|
int gps_l1_ca_gps_sdr_acquisition_ss::general_work(int noutput_items,
|
|
gr_vector_int &ninput_items, gr_vector_const_void_star &input_items,
|
|
gr_vector_void_star &output_items)
|
|
{
|
|
|
|
if (!d_active)
|
|
{
|
|
d_sample_counter += d_fft_size * noutput_items; // sample counter
|
|
consume_each(noutput_items);
|
|
}
|
|
else
|
|
{
|
|
d_sample_counter += d_fft_size; // sample counter
|
|
|
|
const CPX *in = (const CPX *)input_items[0];
|
|
|
|
CPX* buffer = new CPX[d_fft_size];
|
|
|
|
signed int index = 0;
|
|
unsigned int indext = 0;
|
|
unsigned int magt = 0;
|
|
|
|
DLOG(INFO) << "copied " << (d_fft_size * sizeof(CPX))
|
|
<< " bytes into buffer (" << d_fft_size << " samples)";
|
|
memcpy(d_baseband_signal, in, d_fft_size * sizeof(CPX));
|
|
#ifdef NO_SIMD
|
|
x86_cmulsc(d_baseband_signal, d_sine_250,
|
|
&d_baseband_signal[d_fft_size], d_fft_size, 14);
|
|
x86_cmulsc(d_baseband_signal, d_sine_500, &d_baseband_signal[2
|
|
* d_fft_size], d_fft_size, 14);
|
|
x86_cmulsc(d_baseband_signal, d_sine_750, &d_baseband_signal[3
|
|
* d_fft_size], d_fft_size, 14);
|
|
x86_cmuls(d_baseband_signal, d_sine_if, d_fft_size, 14);
|
|
#else
|
|
sse_cmulsc(d_baseband_signal, d_sine_250,
|
|
&d_baseband_signal[d_fft_size], d_fft_size, 14);
|
|
sse_cmulsc(d_baseband_signal, d_sine_500, &d_baseband_signal[2
|
|
* d_fft_size], d_fft_size, 14);
|
|
sse_cmulsc(d_baseband_signal, d_sine_750, &d_baseband_signal[3
|
|
* d_fft_size], d_fft_size, 14);
|
|
sse_cmuls(d_baseband_signal, d_sine_if, d_fft_size, 14);
|
|
#endif
|
|
for (unsigned int i = 0; i < d_doppler_resolution; i++)
|
|
{
|
|
d_pFFT->doFFT(&d_baseband_signal[i * d_fft_size], true);
|
|
memcpy(&d_baseband_signal_shift[i * (d_fft_size + 201)],
|
|
&d_baseband_signal[(i + 1) * d_fft_size - 100], 100
|
|
* sizeof(CPX));
|
|
memcpy(&d_baseband_signal_shift[(i * (d_fft_size + 201)) + 100],
|
|
&d_baseband_signal[i * d_fft_size], d_fft_size
|
|
* sizeof(CPX));
|
|
memcpy(&d_baseband_signal_shift[(i * (d_fft_size + 201)) + 100
|
|
+ d_fft_size], &d_baseband_signal[i * d_fft_size], 100
|
|
* sizeof(CPX));
|
|
}
|
|
|
|
// Here begins the actual acquisition process.
|
|
|
|
for (int i = -d_doppler_max / 1000; i < (int)d_doppler_max / 1000; i++)
|
|
{
|
|
for (unsigned int j = 0; j < d_doppler_resolution; j++)
|
|
{
|
|
|
|
#ifdef NO_SIMD
|
|
x86_cmulsc(&d_baseband_signal_shift[(j * (d_fft_size + 201))
|
|
+ 100 + i], d_fft_codes[d_satellite], buffer,
|
|
d_fft_size, 10);
|
|
#else
|
|
sse_cmulsc(&d_baseband_signal_shift[(j * (d_fft_size + 201))
|
|
+ 100 + i], d_fft_codes[d_satellite], buffer,
|
|
d_fft_size, 10);
|
|
#endif
|
|
d_piFFT->doiFFT(buffer, true);
|
|
x86_cmag(buffer, d_fft_size);
|
|
x86_max((unsigned int *)buffer, &indext, &magt, d_fft_size);
|
|
|
|
if (magt > d_mag)
|
|
{
|
|
d_mag = magt;
|
|
index = indext;
|
|
d_prn_code_phase = ceil((index * d_samples_per_ms)
|
|
/ d_fft_size);
|
|
d_doppler_freq_shift = (i * 1000.0) + (j * 250.0);
|
|
|
|
if (d_dump)
|
|
{
|
|
d_dump_file.open(d_dump_filename.c_str(),
|
|
std::ios::out | std::ios::binary);
|
|
std::streamsize n = sizeof(unsigned int) * d_fft_size;
|
|
d_dump_file.write((char*)buffer, n);
|
|
d_dump_file.close();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
DLOG(INFO) << "satellite " << d_satellite;
|
|
//result->code_phase = 2048 - index;
|
|
DLOG(INFO) << "code phase " << d_prn_code_phase;
|
|
//result->doppler = (lcv*1000) + (float)lcv2*250;
|
|
DLOG(INFO) << "doppler " << d_doppler_freq_shift;
|
|
//result->magnitude = mag;
|
|
DLOG(INFO) << "magnitude " << d_mag;
|
|
|
|
d_active = false;
|
|
|
|
delete buffer;
|
|
|
|
DLOG(INFO) << "Acquisition done";
|
|
|
|
int acquisition_message = -1; //0=STOP_CHANNEL 1=ACQ_SUCCEES 2=ACQ_FAIL
|
|
|
|
if (d_mag > d_threshold)
|
|
{
|
|
d_acq_sample_stamp = d_sample_counter;
|
|
acquisition_message = 1; //ACQ_SUCCES
|
|
}
|
|
else
|
|
{
|
|
acquisition_message = 2; //ACQ_FAIL
|
|
|
|
}
|
|
|
|
d_channel_internal_queue->push(acquisition_message);
|
|
|
|
consume_each(1);
|
|
}
|
|
return 0;
|
|
|
|
}
|