tfest with forcing stable poles

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Alborz Sakhaei
Alborz Sakhaei 2020-10-5
回答： Arkadiy Turevskiy 2021-2-15
Is it possible to force tfest to only use stable poles to estimate the transfer function?
Test case:
Trying to estimate TF from following freq response data.
Using tefest, with any combinations of nz and np, the estimated transfer function always contain unstable (+ve) poles.
%% FRD Data
% Mag vs Freq
mag_db_freq_hz = [0.001 0.1 2.5 7.3 ];
mag_db = [-3 -3 -3 -11.5 ];
% Phase vs Freq
phase_deg_freq_hz = [0.001 0.1 0.26 0.58 1 1.75 2.8 3.5 ];
phase_deg = [-20 -20 -23 -30 -37 -54 -75 -90 ];

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采纳的回答

Arkadiy Turevskiy
Arkadiy Turevskiy 2021-2-15
You can use EnforceStabilty option for tfestOptions:
https://www.mathworks.com/help/ident/ref/tfestoptions.html

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