Structure Design Of One-to-multiple Space Wireless Laser Communication System

With the rapid progress of China's aerospace industry,the requirements for space communication are constantly improving.Especially in terms of communication quality,there should be a new communication with faster speed,stronger anti-interference ability,and with smaller energy consumption.Traditional radio communications has fallen behind in these areas.Wireless laser communication as a new means of communication is becoming the development direction of future space communication.In this thesis,a wireless laser communication base station based on multiple bands was designed,which can communicate with multiple points at the same time.This thesis mainly designed the relay system and the splitting system(branch optical system was included).Of the communication system,the transmitting end,the beacon transmitting end,the coarse tracking receiving end(three groups),the fine tracking receiving end(three groups),and the communication receiving end(three groups)all those eleven optical systems were included.All the transmitting ends and the receiving ends shares a relay system.The designed relay system was R-C system based on the Cassegrain optical system.The primary mirror was parameterized and optimized by orthogonal experiment.Finally,the SiC primary mirror with mass of 1.34 kg was obtained,and the lightweight ratio was 77.57804%.the optomechanical structure of the relay system was designed,and the bipod structure was used as the main mirror support structure,A full set of Stray light elimination mechanism of the Cassegrain system was elaborately designed.the spectroscopic system and the optical systems of each branch were designed.Auxiliary fiber coupling adjustment mechanism was designed at the three-way communication receiving station.On this basis,the relay system and the spectroscopic system adjustment scheme were designed.Finally,optical-mechanicalthermal integration analysis of the system was carried out.The Zernike coefficient of the optical component surface was fitted by Sigfit software,and the imaging quality of the system under the ZEMAX software analysis working environment was brought in.The simulation results verified that the optomechanical structure was reasonable.The simulation results verified the rationality of optical-mechanical structure design and the feasibility of one-tomany wireless laser communication scheme.