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Re: System identification...

From: Doug Stewart
Subject: Re: System identification...
Date: Wed, 19 Jan 2011 07:32:37 -0500

On Wed, Jan 19, 2011 at 3:19 AM, Rudolf Widmer-Schnidrig <address@hidden> wrote:
Dear List,

I have measured (in the time domain) input and output of a mechanical system (a seismometer) and would like to derive a filter model B(s)/A(S) based on this data.

I see the path via the frequency domain:
[H, F] = pwelch(input,output,.....'trans')
[B, A] = invfreqs(H,F,nA,nB)

Question: is there a way to find A and B without going first into the Fourier domain?

    many cheers           - Ruedi

             Rudolf Widmer-Schnidrig

What Input did you use?
If it was an impulse then Yes
if it was a step then yes
and maybe more.


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