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https://github.com/gnss-sdr/gnss-sdr
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Minor changes in matlab acquisition grid plot script
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@ -31,7 +31,7 @@
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% */
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%%%%%%%%% ¡¡¡ CONFIGURE !!! %%%%%%%%%%%%%
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sat = 27;
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sat = 30;
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n_chips = 1023;
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system = 'G'; % GPS = 'G', Galileo = 'E'
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%%% True for light grid representation
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@ -40,23 +40,33 @@ lite_view = true;
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n_samples_per_chip = 4;
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path='/home/aramos/signals/';
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path='/home/aramos/signals/GNSS-IN-THE-SPACE/CAPTURES SPIRENT/acq/';
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file=['acq_' system '_sat_' num2str(sat) '.mat'];
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load([path file]);
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[n_fft n_dop_bins] = size(grid);
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[d_max f_max] = find(grid == max(max(grid)));
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freq = (0 : n_dop_bins - 1) * doppler_step - doppler_max;
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delay = (0 : n_fft - 1) / n_fft * n_chips;
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figure(1)
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if(lite_view == false)
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mesh(freq, delay, grid)
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surf(freq, delay, grid)
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else
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delay_interp = (0 : n_samples_per_chip * n_chips - 1) / n_samples_per_chip;
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grid_interp = spline(delay, grid', delay_interp)';
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mesh(freq, delay_interp, grid_interp)
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surf(freq, delay_interp, grid_interp)
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end
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xlabel('Doppler shift / Hz')
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ylabel('Code delay / chips')
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zlabel('Test statistics')
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figure(2)
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subplot(2,1,1)
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plot(freq, grid(d_max, :))
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xlabel('Doppler shift / Hz')
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ylabel('Test statistics (fixed delay)')
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subplot(2,1,2)
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plot(delay, grid(:, f_max))
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xlabel('Code delay / chips')
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ylabel('Test statistics (fixed Doppler shift)')
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