I need to estimate a transfer function for a system.
The system at first operates at a non-zero steady state value then it was excited using a PRBS signal.
To estimate the transfer function correctly its assumed that it was excited with zero initial conditions.
How can I process the measured output signal in order to deal with it as if it was with zero initial conditions.
is the 'detrend' MATLAB command can do this job?
Yes, you can use "detrend," or you can simply shift your output signal such that the steady state value is at zero before you identify the transfer function. For example, suppose 'y' is a vector containing the values of your output signal and the steady state value is 2. Then simply do 'yp = y-2' to shift your output signal so that the steady state value is zero, and then identify the system using yp.
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