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https://github.com/gnss-sdr/gnss-sdr
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83 lines
2.2 KiB
Matlab
83 lines
2.2 KiB
Matlab
% Reads GNSS-SDR Acquisition dump binary file using the provided
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% function and plots acquisition grid of acquisition statistic of PRN sat
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%
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% This function analyzes a experiment performed by Luis Esteve in the framework
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% of the Google Summer of Code (GSoC) 2012, with the collaboration of Javier Arribas
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% and Carles Fernandez, related to the extension of GNSS-SDR to Galileo.
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%
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% -------------------------------------------------------------------------
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%
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% GNSS-SDR is a Global Navigation Satellite System software-defined receiver.
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% This file is part of GNSS-SDR.
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%
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% Copyright (C) 2010-2019 (see AUTHORS file for a list of contributors)
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% SPDX-License-Identifier: GPL-3.0-or-later
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%
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% -------------------------------------------------------------------------
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%
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function plot_acq_grid_gsoc_glonass(sat)
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file=['/archive/acquisition_R_1G_sat_' num2str(sat) '_doppler_0.dat'];
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% sampling_freq_Hz=62316000
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sampling_freq_Hz=6.625e6
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Doppler_max_Hz = 10000
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Doppler_min_Hz = -10000
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Doppler_step_Hz = 250
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% read files
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x=read_complex_binary (file);
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l_y=length(x);
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Doppler_axes=Doppler_min_Hz:Doppler_step_Hz:Doppler_max_Hz;
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l_x=length(Doppler_axes);
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acq_grid = zeros(l_x,l_y);
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index=0;
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for k=Doppler_min_Hz:Doppler_step_Hz:Doppler_max_Hz
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index=index+1;
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filename=['acquisition_R_1G_sat_' num2str(sat) '_doppler_' num2str(k) '.dat'];
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acq_grid(index,:)=abs(read_complex_binary (filename));
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end
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acq_grid = acq_grid.^2;
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maximum_correlation_peak = max(max(acq_grid))
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[fila,col]=find(acq_grid==max(max(acq_grid)));
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delay_error_sps = col -1
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Doppler_error_Hz = Doppler_axes(fila)
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noise_grid=acq_grid;
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delay_span=floor(3*sampling_freq_Hz/(0.511e6));
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Doppler_span=floor(500/Doppler_step_Hz);
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noise_grid(fila-Doppler_span:fila+Doppler_span,col-delay_span:col+delay_span)=0;
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n=numel(noise_grid)-(2*delay_span+1)*(2*Doppler_span+1);
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noise_floor= sum(sum(noise_grid))/n
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Gain_dbs = 10*log10(maximum_correlation_peak/noise_floor)
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%% Plot 3D FULL RESOLUTION
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[X,Y] = meshgrid(Doppler_axes,1:1:l_y);
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figure;
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surf(X,Y,acq_grid');
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xlabel('Doppler(Hz)');ylabel('Code Delay(samples)');title(['GLRT statistic of Glonass Parallel Code Phase Search Acquisition. Local replica: L1 cboc PRN ' num2str(sat)]);
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end
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