Thomas Dehaeze
6e3677eb29
Folder name is changed, rework the html templates Change the organisation.
87 lines
3.0 KiB
Matlab
87 lines
3.0 KiB
Matlab
% Matlab Init :noexport:ignore:
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current_dir='/home/thomas/MEGA/These/meas/huddle-test-geophones/';
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%% Go to current Directory
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cd(current_dir);
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%% Clear Workspace and Close figures
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clear; close all; clc;
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%% Intialize Laplace variable
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s = zpk('s');
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%% Initialize ans with org-babel
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ans = 0;
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% Load data
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% We first load the data for the three axis.
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z = load('mat/data_001.mat', 't', 'x1', 'x2');
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east = load('mat/data_002.mat', 't', 'x1', 'x2');
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north = load('mat/data_003.mat', 't', 'x1', 'x2');
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% Compare PSD
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% The PSD for each axis of the two geophones are computed.
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[pz1, fz] = pwelch(z.x1, hanning(ceil(length(z.x1)/100)), [], [], 1/(z.t(2)-z.t(1)));
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[pz2, ~] = pwelch(z.x2, hanning(ceil(length(z.x2)/100)), [], [], 1/(z.t(2)-z.t(1)));
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[pe1, fe] = pwelch(east.x1, hanning(ceil(length(east.x1)/100)), [], [], 1/(east.t(2)-east.t(1)));
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[pe2, ~] = pwelch(east.x2, hanning(ceil(length(east.x2)/100)), [], [], 1/(east.t(2)-east.t(1)));
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[pn1, fn] = pwelch(north.x1, hanning(ceil(length(north.x1)/100)), [], [], 1/(north.t(2)-north.t(1)));
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[pn2, ~] = pwelch(north.x2, hanning(ceil(length(north.x2)/100)), [], [], 1/(north.t(2)-north.t(1)));
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% We compare them. The result is shown on figure [[fig:compare_axis_psd]].
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figure;
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hold on;
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plot(fz, sqrt(pz1), '-', 'Color', [0 0.4470 0.7410], 'DisplayName', 'z');
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plot(fz, sqrt(pz2), '--', 'Color', [0 0.4470 0.7410], 'HandleVisibility', 'off');
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plot(fe, sqrt(pe1), '-', 'Color', [0.8500 0.3250 0.0980], 'DisplayName', 'east');
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plot(fe, sqrt(pe2), '--', 'Color', [0.8500 0.3250 0.0980], 'HandleVisibility', 'off');
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plot(fn, sqrt(pn1), '-', 'Color', [0.9290 0.6940 0.1250], 'DisplayName', 'north');
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plot(fn, sqrt(pn2), '--', 'Color', [0.9290 0.6940 0.1250], 'HandleVisibility', 'off');
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hold off;
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set(gca, 'xscale', 'log'); set(gca, 'yscale', 'log');
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xlabel('Frequency [Hz]'); ylabel('PSD [m/s/sqrt(Hz)]');
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legend('Location', 'northeast');
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xlim([0, 500]);
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% Compare TF
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% The transfer functions from one geophone to the other are also computed for each axis.
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% The result is shown on figure [[fig:compare_tf_axis]].
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[Tz, fz] = tfestimate(z.x1, z.x2, hanning(ceil(length(z.x1)/100)), [], [], 1/(z.t(2)-z.t(1)));
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[Te, fe] = tfestimate(east.x1, east.x2, hanning(ceil(length(east.x1)/100)), [], [], 1/(east.t(2)-east.t(1)));
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[Tn, fn] = tfestimate(north.x1, north.x2, hanning(ceil(length(north.x1)/100)), [], [], 1/(north.t(2)-north.t(1)));
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figure;
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ax1 = subplot(2, 1, 1);
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hold on;
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plot(fz, abs(Tz), 'DisplayName', 'z');
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plot(fe, abs(Te), 'DisplayName', 'east');
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plot(fn, abs(Tn), 'DisplayName', 'north');
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hold off;
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set(gca, 'xscale', 'log'); set(gca, 'yscale', 'log');
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set(gca, 'XTickLabel',[]);
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ylabel('Magnitude');
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legend('Location', 'southwest');
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ax2 = subplot(2, 1, 2);
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hold on;
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plot(fz, mod(180+180/pi*phase(Tz), 360)-180);
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plot(fe, mod(180+180/pi*phase(Te), 360)-180);
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plot(fn, mod(180+180/pi*phase(Tn), 360)-180);
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hold off;
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set(gca, 'xscale', 'log');
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ylim([-180, 180]);
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yticks([-180, -90, 0, 90, 180]);
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xlabel('Frequency [Hz]'); ylabel('Phase');
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linkaxes([ax1,ax2],'x');
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xlim([1, 500]);
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