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I had to give sine burst to get good SNR. enter image description here

In above Blue color -> Actuation signal or input. Orange -> Response or output.

I did use hanning window for both.

enter image description here

The frf real & imaginary plot got swapped. Which means this is not the real frequency spectrum looks like when I do sine sweep.

enter image description here

I used Rectangular window, I got below result

enter image description here

….. I tried searching, I couldn’t find any solution that solve this problem. Can you please guide me what am I missing?

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    $\begingroup$ Add details about exactly what you are trying to accomplish. Do you want a filter that rings for a long time at a particular frequency when it is excited by your sine wave pulse above? What are you measuring for SNR? Do you want a bandpass filter for that frequency? $\endgroup$ – IanJ Dec 6 '20 at 21:09

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