87 lines
2.7 KiB
Matlab
87 lines
2.7 KiB
Matlab
%% =========================================================
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% Data
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% =========================================================
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X = single(raw_DPW.Data); % [512 x nFrames x nTime]
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X = X(:,:,2:end); % First DPW is zeroed
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X = 2*X; % Rescale (see channelizer block on PL)
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[nSamples, nFrames, nTime] = size(X);
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N = nSamples;
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%% =========================================================
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% Parameters
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% =========================================================
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Fs = 512e6; % Hz
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f_axis = (-N/2 : N/2-1) * (Fs/N) / 1e6; % MHz
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%% =========================================================
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% Apply fftshift per frame (dim = 1)
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% =========================================================
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X_shift = fftshift(X, 1);
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%% =========================================================
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% Convert to power
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% =========================================================
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P = abs(X_shift).^2;
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%% =========================================================
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% OPTION 1 — Mean Spectrum (over frames AND time)
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% =========================================================
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P_mean = mean(P, [2 3]); % average over frames and triggers
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P_mean = squeeze(P_mean); % [512 x 1]
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figure;
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plot(f_axis, 10*log10(P_mean + 1e-12), 'LineWidth', 1.5);
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grid on;
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xlabel('Frequency (MHz)');
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ylabel('Power (dB)');
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title('Mean Channelized Spectrum (Frames + Time)');
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%% =========================================================
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% OPTION 2 — Max Spectrum (detect intermittent peaks)
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% =========================================================
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P_max = max(P, [], [2 3]);
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P_max = squeeze(P_max);
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figure;
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plot(f_axis, 10*log10(P_max + 1e-12), 'LineWidth', 1.5);
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grid on;
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xlabel('Frequency (MHz)');
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ylabel('Power (dB)');
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title('Max Channelized Spectrum (Frames + Time)');
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%% =========================================================
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% OPTION 3 — Time-Frequency Visualization
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% =========================================================
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% Collapse frames → keep time evolution
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P_time = squeeze(mean(P, 2)); % [512 x nTime]
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figure;
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surf(1:nTime, f_axis, 10*log10(P_time + 1e-12), 'EdgeColor','none');
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view(2);
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axis tight;
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xlabel('Trigger Index');
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ylabel('Frequency (MHz)');
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title('Channelizer Output Over Time');
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colorbar;
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%% =========================================================
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% OPTIONAL — Frame evolution inside a single trigger
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% =========================================================
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t_sel = 5; % pick last capture
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P_frame = squeeze(P(:,:,t_sel)); % [512 x nFrames]
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figure;
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surf(1:nFrames, f_axis, 10*log10(P_frame + 1e-12), 'EdgeColor','none');
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view(2);
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axis tight;
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xlabel('Frame Index');
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ylabel('Frequency (MHz)');
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title(['Channelizer Output Within DPW (Trigger ', num2str(t_sel), ')']);
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colorbar; |