Computing spectrogram using STFT

I have Radar motion data. There are two columns time and amplitude. Can someone help, how to find spectrogram of raw signal using STFT. For the reference I am uploading a sample image, what I exactly need.

Answer 1

[Star Strider]

Use the pspectrum function with the 'spectrogram' option.

[Ritesh Chandra Tewari]

can you please help me with code. Let x be the data matrix containing two columns, 1st column represents time and 2nd column represents amplitude of the radar signal.

[Star Strider]

The documentation explains it better than I can.

Prototype code would be:

pspectrum(2nd_column, 1st_column, 'spectrogram')

or:

[p,f,t] = pspectrum(2nd_column, 1st_column, 'spectrogram');

Beyond that, you will have to experiment with your data to get the result you want. See the documentation for details.