受光束漂移影响的深空上行激光通信链路信道容量  

Achievable information rate of deep-space laser uplink communication in presence of beam wander effects

作　　者：廖慧兮 徐宝碧[1] 黄晓峰[1] 韩宇[1] Liao Huixi Xu Baobi Huang Xiaofeng Han Yu(Institute of Spacecraft System Engineering, Beijing 100094, China)

机构地区：[1]北京空间飞行器总体设计部

出　　处：《红外与激光工程》2017年第10期278-285,共8页Infrared and Laser Engineering

摘　　要：使用Monte-Carlo仿真方法,基于光强闪烁和光束漂移的联合模型,对使用脉冲编码调制方式(PPM)和雪崩光电二极管(APD)探测器直接探测接收的深空上行激光通信链路的信道容量进行了分析。仿真结果表明,与下行链路中信道容量随着束散角的增加而单调下降的现象不同,对于存在光束漂移作用的上行星地激光链路,存在一个最优发射束散角使得星地激光系统的信道容量最大。在此基础上,对最优束散角与发射光束数目、方位角、热噪声和发射端的光束半径之间的关系进行了分析。所得的结果可以帮助实现星地激光通信系统上行链路的优化设计。Based on Monte-Carlo simulation, the achievable information rate of the Q-ary pulse-position modulation and avalanche photodiode （APD）-based deep-space optical uplink channel was investigated for the beam wander and intensity fluctuation model. The results indicate that unlike the downlink channel, when the beam wander effect is taken into account, optimum divergence angle can be selected to achieve the maximum achievable information rate for the uplink channel. Besides, with respect to achievable information rate, the optimum divergence angle dependence on the transmitted beam number, the zenith angle, thermal noise and transmitted beam width have been evaluated. This work can be helpful for the uplink laser communication system design.

关 键 词：大气湍流 光束漂移 深空激光通信系统 信道容量 

分 类 号：TN929.12[电子电信—通信与信息系统]