Title :
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
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;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.2008.925721
