mirror of https://github.com/gnss-sdr/gnss-sdr
81 lines
2.2 KiB
Matlab
81 lines
2.2 KiB
Matlab
% Reads GNSS-SDR Acquisition dump binary file using the provided
|
|
% function and plots 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 Fern??ndez, related to the extension of GNSS-SDR to Galileo.
|
|
%
|
|
% Luis Esteve, 2012. luis(at)epsilon-formacion.com
|
|
% -------------------------------------------------------------------------
|
|
%
|
|
% GNSS-SDR is a Global Navigation Satellite System software-defined receiver.
|
|
% This file is part of GNSS-SDR.
|
|
%
|
|
% Copyright (C) 2010-2019 (see AUTHORS file for a list of contributors)
|
|
% SPDX-License-Identifier: GPL-3.0-or-later
|
|
%
|
|
% -------------------------------------------------------------------------
|
|
%
|
|
|
|
function plot_acq_grid_gsoc(sat)
|
|
|
|
file=['test_statistics_E_1C_sat_' num2str(sat) '_doppler_0.dat'];
|
|
|
|
sampling_freq_Hz=4E6
|
|
Doppler_max_Hz = 9875
|
|
Doppler_min_Hz = -10000
|
|
Doppler_step_Hz = 125
|
|
|
|
|
|
% 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=['test_statistics_E_1C_sat_' num2str(sat) '_doppler_' num2str(k) '.dat'];
|
|
acq_grid(index,:)=abs(read_complex_binary (filename));
|
|
end
|
|
|
|
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/(1.023e6));
|
|
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 Galileo Parallel Code Phase Search Acquisition. Local replica: E1C cboc PRN ' num2str(sat)]);
|
|
|
|
|
|
end
|