The Laser Communication and Aiming Antenna Research for Micro-nano Satellite

With the rapid development of space technology, the use of low-orbit micro-nano satellite platform to build communication network has become a hot spot in the future development. Laser communication has the outstanding advantages of large communication capacity, light weight, low power consumption, small size and good confidentiality. In order to solve the bottleneck problem of communication capacity and confidentiality of traditional microwave communication methods and the load volume of micro-nano satellites, The requirements for weight and power consumption provide a new way. They are highly valued by countries such as Europe, the United States, and Japan. They invest a lot of resources in related research, and are actively developing into commercialization and practical use to establish global micro- Nano satellite laser communication network is an inevitable trend. In this paper, the application background of laser communication antenna for low-orbit micro-nano satellite is carried out, and the in-depth study of laser communication and sighting antenna is carried out. The modal analysis and thermo-coupling analysis of the mirror assembly are used to optimize the design and the antenna is inspected. In the light and miniaturized design process, the problems of different axes of the telephoto axis of the telephoto unit and the azimuth axis are encountered. Through the analysis of the problem, the coaxiality adjustment device based on the wedge and the optical axis of the wedge is designed and designed. Based on the principle of double wedge refraction, the optical axis is effectively adjusted by rotating the wedge angle to ensure its coaxiality. It has important theoretical value and guiding significance for the related research of laser communication antenna for micro-nano satellite.