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Add plot function for glonass acquisition

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Gastd 2017-07-18 18:26:57 -03:00
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src/utils/matlab/plot_acq_grid_gsoc_glonass.m Normal file
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% /*!
% * \file plot_acq_grid_gsoc.m
% * \brief Read GNSS-SDR Acquisition dump binary file using the provided
% function and plot acquisition grid of acquisition statistic of PRN sat
%
% This function analyzes a experiment performed by Luis Esteve in the framework
% of the Google Summer of Code (GSoC) 2012, with the collaboration of Javier Arribas
% and Carles Fernández, related to the extension of GNSS-SDR to Galileo.
%
% * \author Luis Esteve, 2012. luis(at)epsilon-formacion.com
% * -------------------------------------------------------------------------
% *
% * 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/>.
% *
% * -------------------------------------------------------------------------
% */
function plot_acq_grid_gsoc_glonass(sat)
file=['acquisition_R_1G_sat_' num2str(sat) '_doppler_0.dat'];
sampling_freq_Hz=62316000
Doppler_max_Hz = 10000
Doppler_min_Hz = -10000
Doppler_step_Hz = 250
% read files
x=read_complex_binary (file);
l_y=length(x);
Doppler_axes=Doppler_min_Hz:Doppler_step_Hz:Doppler_max_Hz;
l_x=length(Doppler_axes);
acq_grid = zeros(l_x,l_y);
index=0;
for k=Doppler_min_Hz:Doppler_step_Hz:Doppler_max_Hz
index=index+1;
filename=['acquisition_R_1G_sat_' num2str(sat) '_doppler_' num2str(k) '.dat'];
acq_grid(index,:)=abs(read_complex_binary (filename));
end
acq_grid = acq_grid.^2;
maximum_correlation_peak = max(max(acq_grid))
[fila,col]=find(acq_grid==max(max(acq_grid)));
delay_error_sps = col -1
Doppler_error_Hz = Doppler_axes(fila)
noise_grid=acq_grid;
delay_span=floor(3*sampling_freq_Hz/(0.511e6));
Doppler_span=floor(500/Doppler_step_Hz);
noise_grid(fila-Doppler_span:fila+Doppler_span,col-delay_span:col+delay_span)=0;
n=numel(noise_grid)-(2*delay_span+1)*(2*Doppler_span+1);
noise_floor= sum(sum(noise_grid))/n
Gain_dbs = 10*log10(maximum_correlation_peak/noise_floor)
%% Plot 3D FULL RESOLUTION
[X,Y] = meshgrid(Doppler_axes,1:1:l_y);
figure;
surf(X,Y,acq_grid');
xlabel('Doppler(Hz)');ylabel('Code Delay(samples)');title(['GLRT statistic of Glonass Parallel Code Phase Search Acquisition. Local replica: L1 cboc PRN ' num2str(sat)]);
end