大气折射对空地卫星光通信链路影响的研究

卫星光通信被认为是解决卫星通信高码率“瓶颈”问题的唯一途径。但是在空地光通信系统中 ,由于大气温度与大气压强的随机变化 ,导致大气折射率不再是常数。当激光在大气中传输时 ,由于折射的影响 ,光束不再沿直线传播 ,而是按折射定律产生折射效应。这就使得光束到达卫星站 (或地球站 )时偏离了原来的位置 ,影响系统的通信性能。同时由于湍流的存在 ,它又会产生一些湍流效应。本文在此基础上给出了大气折射率模型 ,并由大气光路方程得出在空地卫星通信系统中 ,光束在整个大气中的传输特性。它是研究空地卫星光通信中的大气折射的重要课题

Atmospheric refraction affects the system of space-earth satellite communication

Satellite optical communication is considered the only way to overcome the bottle-neck in high speed satellite communication.But in the communication system of space-earth,the atmospheric refraction is changed at all times because of stochastic temperature and pressure.Refractive phenomena instead of line-diffuse when laser transmit through space.Then the beam departs formerly position at satellite(earth)station.This paper will give the model of atmospheric refraction and the refractive index model in turbulent atmosphere.We can evaluate the radiation transmission character by use of the equation of ray orbit.It is the significant question to study the atmospheric refraction in earth to space satellite communication system.