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https://github.com/gnss-sdr/gnss-sdr
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- PCPS Acquisition VOLK optimizations for the carrier wipeoff operation.
-Added galileo E1 tracking matlab plot utility for 32 bits systems git-svn-id: https://svn.code.sf.net/p/gnss-sdr/code/trunk@248 64b25241-fba3-4117-9849-534c7e92360d
This commit is contained in:
Javier Arribas
parent
bcce5431b7
commit
4859faa245
@ -75,9 +75,9 @@ pcps_acquisition_cc::pcps_acquisition_cc(
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d_mag = 0;
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d_input_power = 0.0;
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d_sine_if = new gr_complex[d_fft_size];
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d_fft_codes = (gr_complex*)malloc(sizeof(gr_complex) * d_fft_size);
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//todo: do something if posix_memalign fails
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if (posix_memalign((void**)&d_carrier, 16, d_fft_size * sizeof(gr_complex)) == 0){};
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if (posix_memalign((void**)&d_fft_codes, 16, d_fft_size * sizeof(gr_complex)) == 0){};
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// Direct FFT
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d_fft_if = new gri_fft_complex(d_fft_size, true);
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@ -92,8 +92,8 @@ pcps_acquisition_cc::pcps_acquisition_cc(
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pcps_acquisition_cc::~pcps_acquisition_cc()
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{
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delete[] d_sine_if;
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delete[] d_fft_codes;
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free(d_carrier);
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free(d_fft_codes);
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delete d_ifft;
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delete d_fft_if;
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@ -175,7 +175,6 @@ int pcps_acquisition_cc::general_work(int noutput_items,
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int acquisition_message = -1; //0=STOP_CHANNEL 1=ACQ_SUCCEES 2=ACQ_FAIL
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//aux vars
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unsigned int i;
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float fft_normalization_factor;
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@ -199,20 +198,18 @@ int pcps_acquisition_cc::general_work(int noutput_items,
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{
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//doppler search steps
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//Perform the carrier wipe-off
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complex_exp_gen(d_sine_if, d_freq + doppler, d_fs_in, d_fft_size);
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for (i = 0; i < d_fft_size; i++)
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complex_exp_gen(d_carrier, d_freq + doppler, d_fs_in, d_fft_size);
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if (is_unaligned()==true)
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{
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d_fft_if->get_inbuf()[i] = in[i] * d_sine_if[i];
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volk_32fc_x2_multiply_32fc_u(d_fft_if->get_inbuf(), in, d_carrier, d_fft_size);
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}else{
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//use directly the input vector
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volk_32fc_x2_multiply_32fc_a(d_fft_if->get_inbuf(), in, d_carrier, d_fft_size);
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}
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//3- Perform the FFT-based circular convolution (parallel time search)
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d_fft_if->execute();
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// Using plain C++ operations
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// for (i = 0; i < d_fft_size; i++)
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// {
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// d_ifft->get_inbuf()[i] = (d_fft_if->get_outbuf()[i]
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// * d_fft_codes[i]) / (float)d_fft_size;
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// }
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// Using SIMD operations with VOLK library
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volk_32fc_x2_multiply_32fc_a(d_ifft->get_inbuf(), d_fft_if->get_outbuf(), d_fft_codes, d_fft_size);
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@ -101,7 +101,7 @@ private:
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unsigned int d_sampled_ms;
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unsigned int d_fft_size;
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unsigned long int d_sample_counter;
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gr_complex* d_sine_if;
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gr_complex* d_carrier;
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gr_complex* d_fft_codes;
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@ -0,0 +1,93 @@
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% /*!
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% * \file galileo_l1_ca_dll_pll_vml_plot_sample_64bits.m
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% * \brief Read GNSS-SDR Tracking dump binary file using the provided
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% function and plot some internal variables
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% * \author Javier Arribas, 2011. jarribas(at)cttc.es
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% * -------------------------------------------------------------------------
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% *
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% * Copyright (C) 2010-2011 (see AUTHORS file for a list of contributors)
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% *
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% * GNSS-SDR is a software defined Global Navigation
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% * Satellite Systems receiver
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% *
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% * This file is part of GNSS-SDR.
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% *
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% * GNSS-SDR is free software: you can redistribute it and/or modify
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% * it under the terms of the GNU General Public License as published by
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% * the Free Software Foundation, either version 3 of the License, or
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% * at your option) any later version.
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% *
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% * GNSS-SDR is distributed in the hope that it will be useful,
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% * but WITHOUT ANY WARRANTY; without even the implied warranty of
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% * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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% * GNU General Public License for more details.
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% *
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% * You should have received a copy of the GNU General Public License
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% * along with GNSS-SDR. If not, see <http://www.gnu.org/licenses/>.
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% *
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% * -------------------------------------------------------------------------
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% */
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close all;
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clear all;
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samplingFreq = 64e6/8; %[Hz]
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channels=2;
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%path='/home/javier/workspace/gnss-sdr/trunk/install/';
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path='/home/javier/workspace/gnss-sdr/trunk/data/';
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clear PRN_absolute_sample_start;
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for N=1:1:channels
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tracking_log_path=[path 'veml_tracking_ch_' num2str(N-1) '.dat'];
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GNSS_tracking(N)= galileo_e1_dll_pll_veml_read_tracking_dump_32bits(tracking_log_path);
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end
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% GNSS-SDR format conversion to MATLAB GPS receiver
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for N=1:1:channels
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trackResults(N).status='T'; %fake track
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trackResults(N).codeFreq=GNSS_tracking(N).code_freq_hz.';
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trackResults(N).carrFreq=GNSS_tracking(N).carrier_doppler_hz.';
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trackResults(N).dllDiscr = GNSS_tracking(N).code_error.';
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trackResults(N).dllDiscrFilt = GNSS_tracking(N).code_nco.';
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trackResults(N).pllDiscr = GNSS_tracking(N).carr_error.';
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trackResults(N).pllDiscrFilt = GNSS_tracking(N).carr_nco.';
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trackResults(N).I_P=GNSS_tracking(N).prompt_I.';
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trackResults(N).Q_P=GNSS_tracking(N).prompt_Q.';
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trackResults(N).I_VE= GNSS_tracking(N).VE.';
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trackResults(N).I_E= GNSS_tracking(N).E.';
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trackResults(N).I_L = GNSS_tracking(N).L.';
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trackResults(N).I_VL = GNSS_tracking(N).VL.';
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trackResults(N).Q_VE = zeros(1,length(GNSS_tracking(N).VE));
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trackResults(N).Q_E = zeros(1,length(GNSS_tracking(N).E));
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trackResults(N).Q_L =zeros(1,length(GNSS_tracking(N).L));
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trackResults(N).Q_VL =zeros(1,length(GNSS_tracking(N).VL));
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trackResults(N).PRN=N; %fake PRN
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% Use original MATLAB tracking plot function
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settings.numberOfChannels=channels;
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settings.msToProcess=length(GNSS_tracking(N).E)*4;
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plotVEMLTracking(N,trackResults,settings)
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end
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% for N=1:1:channels
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% % figure;
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% % plot([GNSS_tracking(N).E,GNSS_tracking(N).P,GNSS_tracking(N).L],'-*');
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% % title(['Early, Prompt, and Late correlator absolute value output for channel ' num2str(N)']);
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% % figure;
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% % plot(GNSS_tracking(N).prompt_I,GNSS_tracking(N).prompt_Q,'+');
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% % title(['Navigation constellation plot for channel ' num2str(N)]);
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% % figure;
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% %
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% % plot(GNSS_tracking(N).prompt_Q,'r');
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% % hold on;
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% % plot(GNSS_tracking(N).prompt_I);
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% % title(['Navigation symbols I(red) Q(blue) for channel ' num2str(N)]);
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% %
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% figure;
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% t=0:4:length(GNSS_tracking(N).carrier_doppler_hz)*4-1;
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% t=t/1000;
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% plot(t,GNSS_tracking(N).carrier_doppler_hz/1000);
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% xlabel('Time(s)');ylabel('Doppler(KHz)');title(['Doppler frequency channel ' num2str(N)]);
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% end
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