The Research Of Channel Model Simulation In Optical Space Communication

Optical space communication was a kind of maturity communication technology since the invention of the laser. Numberous countries had applied it on the research of theories and experiments. Compared with the microwave communication, space laser communication had many incomparable advantages, such as larger communication capability, which did not divert to the original band but made the network flexibility, narrow beam, fine direction, much greater power density functions, high capability of anti-electromagnetic disturbances, strong confidentiality and so on. On the prospect of transaction rates and information security, the price-performance ratio of laser was really high. Laser could be used in satellites, digital satellites and the space shuttle high rate of information transmission.The atmosphere random channel research of this field had been a difficulty, thus, the understanding of space optical communication transmission characteristics of the laser beam had important influence for in-depth studies. All over the world put a lot of focus on the studies and made mass relative research work. For the current communication technology, there should be a channel model which can better describe the basic characteristics of the channel. Based on this model, we can develop a basic simulation research work.This paper was based on the actual research on the theory of deep space, deep space orbital dynamics simulation and monitoring to carry out a detailed simulation study. Finally, I got the simulation of the optical communication system with different channels of the reception.The profile and significance of space optical communication, more detailed analysis of the optical space communication system and key technologies were firstly introduced in my paper, including main components and working process of space laser communication system. Meanwhile the design of communication systems and the optical receiving system were also analysed. In this paper, I analysed the communication link and designed it, at the same time, I considered the optical power and optical factors and focused on analyzing the beam propagation attenuation, atmospheric attenuation and noise impact on communication link. Based on this analysis, I applied space communication theory to establish the link-channel model.In order to achieve the final simulation, I built a more complete channel model of space optical communication. There were four main parts in this paper, including the light transmission model, atmospheric turbulence model, the model of noise and the model of receipting signal. Light transmission model described the angle of the signal pulse generated by diffusion and attenuation through the channel, and the calculation formula of received power; Atmospheric turbulence model, including atmospheric turbulence in the atmosphere spectral model and model of Cn2, mainly simulated the effect of atmospheric turbulence; the model of noise mainly studied on the sun, sky and other light transmission model, and the noise of the received optical power; Receiving signal model included signal power and optical field statistical probability distribution.The actual simulation part was based on a theoretical model of the communication link, by designing software process and editing the simulation module to simulate arriving waveform. Finally, simulation results were analysed.In the end, according to my results, I summarized the problem of the simulation system and gave my personal suggestion in the order to be helpful for the further research.