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how can I compute shot time power spectrum?

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milad_omidi

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how can I compute shot time power spectrum?
 

take a segment of the signal
calculte FFT
take the squre of FFT result
take only the first half values of FFT points
that all
 

There is one important problem: your shot signal must be periodically repeated to be indicated as a spectrum on your analyzer. Only then the above procedure can work.
If you have only one shot run, the best way would be to use an oscilloscope with memory to record it. From the real pulse shape you can calculate the spectrum by the Fourier Transform.
Modern digital oscilloscopes include this function in "MATH"; you can record one shot and see its spectrum, too.
 

Calculate the FFT for a short segment of the signal, and square the spectrum to get a two sided PS.
 

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