Adaptive control of a tilt mirror for laser beam steering

This paper presents design and experimental implementation of an adaptive control system for a two-axis tilt mirror for laser beam steering. Disturbances in the laser beam are rejected by an optimal H/sub /spl infin// feedback controller augmented by an adaptive control loop that identifies control gains that are optimal for the disturbance acting on the laser beam. Identification and control algorithms are applied to a laboratory beam-steering system at UCLA. In the adaptive control loop, an adaptive lattice filter implicitly identifies the disturbance statistics from real-time sensor data. The experimental results demonstrate that the adaptive controller used to augment H/sub /spl infin// controller achieves substantially better disturbance rejection than does the H/sub /spl infin// controller alone.