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Re: System identification...

From: Rudolf Widmer-Schnidrig
Subject: Re: System identification...
Date: Wed, 19 Jan 2011 15:38:46 +0100
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On 19.01.11 13:32, Doug Stewart wrote:

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.

Dear Doug, I have used both a sweep and a random telegraph signal.         -Ruedi

              Rudolf Widmer-Schnidrig
              Black Forest Observatory (BFO)
              Heubach 206
      D-77709 Wolfach, Germany
              e-mail: address@hidden
              phone:  +49 7836 2151   
              fax:  +49 7836 955240
              48d 19' 48.24" North  8d 19' 23.13" East


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