摘要
针对飞机对卫星激光通信上行链路,对背景光、激光大气传输衰减、接收器的接收效率和光强起伏等影响链路性能的因素进行了理论建模和分析;在此基础上,考虑OOK调制和直接检测并结合APD的Webb-Gaussian模型,建立了链路误码率模型。通过数值仿真,得出误码率与入射到APD上的信号光功率之间的关系;分析发现误码率随信号光功率的增加而下降,并且下降速率与信号光功率近似满足对数线性关系。最后,计算得出了链路误码率达到10-7时,发射端所需的最小出瞳功率为0.873W。
Aiming at the uplink of laser communication between airplane and satellite, the factors including the ambient light, the loss of laser propagating in atmosphere, the receiving efficiency of receiver and the laser intensity fluctuation, which all can affect the link performance, were theoretically modeled and analyzed. On the basis of the modeling and analyzing, a link bit error rate （BER） model was proposed by considering on-off-keying （OOK） modulation and direct-detection combined with the Webb-Gaussian approximation of avalanche photodiode detector （APD）. A numerical simulation was performed and the relationship between BER and signal laser power incident on APD was got. It shows that BER decreases while the laser power increases and an approximately log-linear relationship between decreasing speed of BER and laser power can be obtained. Finally, the minimal transmitting power, 0.873W, at transmitter was computed as link could achieve 10-7 BER.
出处
《通信学报》
EI
CSCD
北大核心
2008年第1期125-131,共7页
Journal on Communications
基金
国家高技术研究发展计划(“863”计划)基金资助项目(2003AA712014)~~
关键词
激光通信
链路
误码率
功率分析
卫星
laser communication
link
bit error rate
power analysis
satellite
