大气信道对沿海激光通信的影响分析

为利于沿海靶场激光通信系统的设计与应用,研究分析了晴天、轻霾天、雾天、湍流等常见天气中大气信道对激光通信的影响。针对短距离近地面传输特点,利用经验数学模型仿真分析了激光透过率与能见度以及误码率与折射率结构常量的定量关系。结果表明：激光波长越长,衰减和湍流效应影响越小;晴天大气衰减对通信影响最小,轻霾天次之,雾衰减影响最严重;强湍流闪烁效应对误码率影响较大,但增加链路高度和选择长波长激光可减小影响。

Analysis of Influence of Atmospheric Channel on Laser Communication in Coastal Regions

The influence of atmospheric channel of clear day,light haze day,foggy day and turbulence on laser communication is studied for design and application of laser communication systems in coastal ranges.Making use of the features of short distance transmssion close to the ground,the quantitative relations between the penetration rate and visibility as well as BER(Bit Error Rate) and refractive index structure coeffient are simulated and analyzed with empirical mathematical models.The result shows that the influence of attenuation and turbulence descreases as laser wavelength shortens.The influence is the smallest on clear days,more on light haze days and the most serious on foggy days.The influence of strong turbulence scintillation effect on BER is heavy.However,the influence can be reduced by increasing chain height and using long wavelength laser.