A laser communication acquisition and tracking system and its acquisition and tracking method

Abstract

The invention discloses a laser communication capturing and tracking system. A variable-focus liquid crystal lens is combined with a liquid crystal optical phased array and a liquid crystal optical wedge; the receiving powers of a coarse capturing detection module and a fine tracking detection module are detected in real time in a process of capturing and tracking space laser communication; according to change of the optical receiving power, the variable-focus liquid crystal lens dynamically controls the beam-divergence angle of a laser communication system; the beam-divergence angle is self-adaptively controlled in the capturing and tracking process; and the capturing time can be effectively increased while the tracking precision is ensured. Based on the laser communication capturing and tracking system disclosed by the invention, the invention further provides a capturing and tracking method for self-adaptively controlling the beam-divergence angle of the liquid crystal optical phased array; and a laser communication link is established through respective laser communication capturing and tracking systems of two communication sides.

Description

technical field [0001] The present invention relates to the interdisciplinary technical fields of liquid crystal optics, diffractive optics, and space laser communication, and in particular to a laser communication capture and tracking system, and a capture and tracking method based on the system for adaptive control of liquid crystal optical phased array beam divergence angles. Background technique [0002] In recent years, space laser communication technology has developed rapidly. With the development of space laser communication technology, the data transmission rate is getting higher and higher, and the data transmission rate of the high-speed data transmission relay link needs to achieve real-time data transmission up to 20Gbps. The establishment of satellite laser communication links between relay satellites and medium-low orbit satellites and between medium-low orbit satellites requires an acquisition, tracking and alignment (ATP) process. Among them, the ATP time, ...

AI Technical Summary

Problems solved by technology

However, the capture time of 60 seconds is still too long for the satellite high-speed laser communication system. How to further reduce the capture and follow-up time has become the key technology that the satellite laser communication system needs to break through

The currently established space laser communication system adopts the traditional optical antenna design method. Once the optical antenna is completed, the beam divergence angle is fixed, which cannot make full use of the poor sensitivity of the capture and tracking detectors to adaptively control the beam divergence angle.

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