Constraining parameters with Sys ID Toolbox

I'm trying to fit a TF model to some data, and I need the poles and zeros to be in the left-half plane. My better fits seem to have zeros in the right-half plane. Is there a way to restrict this?

Answer 1

[Arkadiy Turevskiy]

You can specify the structure of a transfer function to estimate (the number of poles and zeros), and can specify that say all numerator coefficients should be positive. This will the absence of non-minimum phase zeros.

See this doc page . Search for the section "specify estimated transfer function model structure and coefficient constraints"