Abstract
The wide-bandwidth optical reference unit (ORU) can provide a reference beam for the line-of-sight stabilization system to achieve precise pointing and tracking. The reference beam leaves the ORU with minimal jitter and becomes a stable ”virtual” star. Active disturbance rejection control (ADRC) is developed from PID control and has been widely used in various electromechanical control systems. However, with the increase of control bandwidth, the high sensor noise seriously affects the stabilization accuracy. In this paper, an improved linear active disturbance rejection control is proposed to improve the performance of the ORU. A noise observer (NOB) is used to suppress the high-frequency noise in the sensor signal and enhance the bandwidth of the ADRC. Simulation results and experimental data indicate that the pointing accuracy and speed are improved.
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