Identification of a Block-Structured Nonlinear Feedback System, Applied to a Microwave Crystal Detector

Author

Schoukens, Johan ; Gommé, Liesbeth ; Van Moer, Wendy ; Rolain, Yves

Author_Institution

Dept. of Fundamental Electr. & Instrum. (ELEC), Vrije Univ. Brussel, Brussels

Volume

57

Issue

8

fYear

2008

Firstpage

1734

Lastpage

1740

Abstract

This paper studies the identification of a block-structured nonlinear Wiener-Hammerstein system that is captured in the feedforward or the feedback path of a closed-loop system. First, nonparametric initial estimates are generated for the three dynamic blocks, which are modeled by their frequency response function, and the static nonlinear system, which is described using an input-output table. Next, a parametric model is identified. Random or periodic excitations can be used in the experiments. The method is illustrated on the identification of an Agilent HP420C crystal detector.

Keywords

closed loop systems; feedback; feedforward; frequency response; microwave detectors; nonlinear control systems; physical instrumentation control; Agilent HP420C crystal detector; block-structured nonlinear feedback system; closed-loop system; frequency response function; microwave crystal detector; nonlinear Wiener-Hammerstein system; nonparametric initial estimates; parametric model; periodic excitation; random excitation; static nonlinear system; Block structure; Wiener–Hammerstein; Wiener??Hammerstein; crystal detector; feedback (FB); nonlinear (NL) systems; system identification;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/TIM.2008.925721

Filename

4539292