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I have to find the transfer function of a given model (matlab). My task is to determine this function, by means of a step response of the system. I have to use graphical methods tot get the parameters, the proces itself is a high order proces with non minimum phase.

[tex]G(s)=K.\frac{(1-Ts)}{(1-\tau s)^{n}}[/tex]

My first attempt (the blue curve isn't very accurate. Someone whith experience who can help me out?

To situate my problem: I have have to find the proces-parameters witch graphical data. Problem is, this isn't very accurate at all..So I'm kinda gambling...But is what I wrote down correct for this process?

Aprreciate help!

grtz

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# System identification

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