Identification of 2x2 system in SS by separate excitations 1x2

Hi,

I have a strongly coupled 2x2 system trying to identify. By parallel excitations of both inputs (with some time separation between impulses), I got some resutls but too noisy. Now I want to combine the identification of two separate experiments: from Input 1 to Output 1 and 2, from Input 2 to Output 1 and 2. And finally, I want to mix the two identified SS results into one joint 2x2 function. I guess this is possible also in SS domain, since in TF domain it is trivial, just filling the matrices.

I am aware that I can get in TF mode, from experiment 1, G11 and G12, and from experiment 2 G21 and G22, and finally to combine in one matrix of TFs [G11 G12; G21 G22]. My question is if this can be done also in State Space.

Answer 1

[Mathieu NOE]

hello

there is already tools available for MIMO identification

look here :

Multivariable Subspace Identification: MOESP - File Exchange - MATLAB Central (mathworks.com)

and the attached zip files - these are from the 90's !! but still valuable tools

[Mathieu NOE]

Hello

Problem solved ?