Title :
Optimal Suppression of Laser Beam Jitter by High-Order RLS Adaptive Control
Author :
Orzechowski, Pawel Konrad ; Chen, Neil Yinan ; Gibson, James Steven ; Tsao, Tsu-Chin
Author_Institution :
California Univ., Los Angeles
fDate :
3/1/2008 12:00:00 AM
Abstract :
This paper demonstrates high-performance adaptive control for a laser-beam steering system, which exhibits high-order unknown jitter dynamics. The adaptive controller, which is based on a recursive least-squares finite-impulse-response lattice filter, has the distinguishing feature that variable and high-order adaptive filters can be realized in the real-time implementation. Varying the order of the adaptive controller produces both fast adaptation and optimal steady-state performance in the experiment, without the large transients often produced by fixed-order recursive least-squares adaptive controllers. The steady-state performance of the high-order adaptive controller approximates closely the theoretically achievable minimum-variance steady-state performance, which is derived from the identified plant and jitter dynamics. Experimental results also illustrate the capability of the adaptive controller to adapt rapidly to changing jitter characteristics.
Keywords :
FIR filters; adaptive control; adaptive filters; jitter; laser beams; least squares approximations; adaptive control; adaptive filters; jitter dynamics; laser beam jitter; laser beam steering system; optimal suppression; recursive least-squares finite-impulse-response lattice filter; Adaptive control; electro-optic systems; laser beam control; optical jitter; optimal control;
Journal_Title :
Control Systems Technology, IEEE Transactions on
DOI :
10.1109/TCST.2007.903377