PSD Based Closed-Loop Control for Lidar System: Design and Application

Lidar is widely used in aerospace vehicle to detect specific object. However, the open-loop lidar systems are usually hard to reach the desired control accuracy. To deal with this problem, this paper uses the position sensitive detector (PSD) to detect the laser angle of lidar system, and it is served as the feedback loop to improve the control accuracy of output laser. The realization and procession of whole closed-loop system is introduced. The measurement accuracy of the feedback loop reaches 0.06°, such result ensures the high precision control of laser angle. Then, a state feedback controller is proposed to make the output laser angle track the reference signal. The stability of closed-loop system is proved. A numerical simulation validates the proposed method.