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针对移动平台空间光通信信道的大气湍流随机性强、指向误差大和链路高动态性等问题,建立适合于移动平台的大气信道模型,并进一步推导出采用脉冲调制(PPM)调制的通信系统端到端信道容量和中断概率的解析表达式。仿真分析了在大气弱湍流、中强湍流两种情况下,信噪比、系统分集、指向误差及通信距离等对通信系统中断概率的影响。结果表明,指向误差不宜超过1mrad;通信距离每增加1km,中断概率上升8~11dB。
In order to solve the problem of stochastic randomness of atmospheric turbulence, high pointing error and high dynamic link of the mobile optical communication channel, the atmospheric channel model suitable for mobile platform is established and the communication system end using pulse modulation (PPM) is further deduced An analytical expression of end-to-end channel capacity and outage probability. The effects of signal to noise ratio, system diversity, pointing error and communication distance on the communication system interruption probability are simulated and analyzed under weak turbulence and strong turbulence. The results show that the pointing error should not exceed 1mrad; for each additional 1km communication distance, the probability of interruption increases by 8 ~ 11dB.