Adaptive control in the presence of quantization and saturation: application to laser beam steering by a liquid crystal device

  • Authors:

  • Pawel K. Orzechowski;Steve Gibson;Tsu-Chin Tsao;Dan Herrick;Victor Beazel;Milind Mahajan;Bing Wen;Bruce Winker

  • Affiliations:

  • Northrop Grumman Aerospace Systems, Controls System Department, Redondo Beach, CA and Mechanical and Aerospace Engineering, University of California, Los Angeles;Mechanical and Aerospace Engineering, University of California, Los Angeles;Mechanical and Aerospace Engineering, University of California, Los Angeles;Optics Division, AFRL, DES, U.S. Air Force Research Laboratory, Kirtland AFB, NM;Optics Division, AFRL, DES, U.S. Air Force Research Laboratory, Kirtland AFB, NM;Teledyne Scientific Company, Thousand Oaks, CA;Teledyne Scientific Company, Thousand Oaks, CA;Teledyne Scientific Company, Thousand Oaks, CA

  • Venue:
  • ACC'09 Proceedings of the 2009 conference on American Control Conference
  • Year:
  • 2009

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Abstract

This paper presents an investigation of adaptive control for a system with control quantization and magnitude and rate saturations. The application is laser beam steering by a liquid crystal device. The effects of using a linear time-invariant feedback loop along with the adaptive controller are discussed, as well as the effects of using nonlinear and linear plant models in the adaptive controller. In contrast to conventional fast steering mirrors, the liquid crystal device optically redirects the laser beam and has no moving parts or structural resonance, which often requires a stabilizing feedback controller prior to the adaptive controller. Simulation and experimental results demonstrate the effects on the adaptive control performance of choices of linear or nonlinear, and open or closed-loop plant models, and show which choices yield best performance.