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Re: System identification...

From: Doug Stewart
Subject: Re: System identification...
Date: Wed, 19 Jan 2011 10:00:47 -0500

On Wed, Jan 19, 2011 at 9:38 AM, Rudolf Widmer-Schnidrig <address@hidden> wrote:
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

A sweep is inherently a frequency domain type of test so maybe you can use Bode type analysis to find the corner freq. and gain and type of role off etc.

is the    random telegraph signal   a white noise type of signal??


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