Research On Expansion Technology Of Receiving Field Of View In Space Laser Communication

Space laser communication is a newly emerging communication technology.With the advantage of the large information capacity,high transmission rate,anti-electromagnetic interference and so on,it has significance in research and application both in satellite network and air to submarine communication.The research and achievements of ground space laser communication are quite numerous especially.However,a major problem that restricts the development of space laser communication,the alignment problem of the transceiver system,which is still a research difficulty that puzzles numerous of scholars all over the world.Therefore,it is of great significance to carry out research on accurate and rapid alignment of space laser communication systems.Considered of expanding the field of view of space laser communication,two ways,multi-aperture and defocusing,are proposed in this paper.On the premise of ensuring that the link receiving energy meets the communication requirements,increasing the defocused receiving energy,thereby the maximum receiving field of view of the laser communication is expanded and the alignment difficulty is reduced.The defocusing receiving system model,multi-aperture emission model and multi-aperture receiving aperture smoothing model are derived and designed by theory combined with experimental simulation.The experimental and simulation results show that when the system defocusing amount is 0.34 mm,the maximum communication receiving field of view of the system can reach 1.12 mrad,which is 2.7 times that of the unfocused condition.And the maximum error between the experimental simulation results and the theoretical derivation are less than 48?rad,which is in the allowable range of errors and that verifies the feasibility of the theory.The simulation of multi-aperture transmission and reception proves that the multi-input multi-output can better mitigate the problems of the intensity flicker caused by atmospheric turbulence compared with single-input single-output.It provides some theoretical and data guidance for the research on the field of view of laser communication in the future.