Research of Characteristics of Error Signal in APT System of Space Laser Communication

This paper analyzes the characteristic of space laser communication, and the importance and necessity of the APT system in space laser communication. The mathematical model is presented to analyze the error signal in APT system of space laser communication. Also, the influence to the tracking velocity and tracking precision of the system brought by the different size of laser beam, the relative location relationship between the laser beam and the detector, and the laser intensity distribution are discussed.