Power spectral density plot

How do I process timestamps vs voltage data to get power spectral density plot?

Answer 1

[Manas]

you can use the following code which uses fft() function

fft_voltage = fft(voltage);

power_spectrum = abs(fft_voltage).^2;

dt = mean(diff(timestamps)); % time resolution

df = 1 / (length(voltage) * dt); % frequency resolution

f = (0:length(voltage)-1) * df; % frequency axis

plot(f, power_spectrum);

xlabel('Frequency (Hz)');

ylabel('PSD');

You can read about this in this documentation Power Spectral Density Estimates Using FFT