Hysteresis modeling and compensation in beam control of satellite laser communication

Abstract

In order to ensure the link stability of satellite laser communication, ongoing control of the received beam at the communication center is imperative. Due to the characteristics of high stiffness and fast response, the fast steering mirror driven by piezoelectric ceramics is widely used as an actuator in the fine tracking system of the satellite laser communication. However, it raises challenges to the closed-loop control of the fine tracking system. The traditional method adds a closed-loop control inside the fine tracking system to linearize the fast steering mirror, that in turn reduces the bandwidth of the fine tracking system considerably. Analyzing the structure of the fast steering mirror reveals that the symmetric hysteresis model could be employed to describe its hysteresis behavior. This study introduces a symmetric hysteresis modeling and compensation method based on Madelung’s rules, which can accurately describe and compensate the hysteresis characteristics of the fast steering mirror, and effectively improve the beam control bandwidth, along with the stability of the communication link. The theoretical simulation and experimental results show the effectiveness of the proposed method.