Optimal Jitter Rejection In Laser Beam Steering with Variable-Order Adaptive Control

This paper demonstrates optimal rejection of laser beam jitter by a variable-order adaptive control scheme based on a recursive least-squares lattice filter. The performance of the adaptive controller in a beam-steering experiment is compared to that of the theoretically optimal linear time-invariant controller. The benefits of adaptive control over theoretically optimal LTI control is demonstrated by experimental results for both stationary and non-stationary jitter. The variable-order adaptive controller is based on an adaptive lattice filter that implicitly identifies the disturbance statistics from realtime sensor data. In steady-state, high-order adaptive controller exerts control authority over a broad spectrum of frequencies. Moreover, compared to a fixed-order adaptive controller, the variable-order adaptive controller exhibits significantly improved transient