大气湍流对复杂路径下光强起伏及误码率的影响  

Atmospheric turbulence effect on the luminous intensity fluctuation and error rater under the complex path

作　　者：刘保菊[1] 张长森[1] 

机构地区：[1]河南理工大学计算机科学与技术学院,河南焦作454003

出　　处：《应用科技》2007年第3期1-3,18,共4页Applied Science and Technology

基　　金：河南省科技攻关基金资助项目(052422047)

摘　　要：对复杂地形情况下实际湍流大气中的激光强度起伏进行系统研究,发现了在此情况下实际湍流大气中的激光光强起伏在概率密度分布与理论上偏离很大,而大气湍流引起的光强起伏和系统误码率的关系表明:在弱起伏条件下,对于系统误码率为10-9以下的要求,光强起伏应小于0.67;随着湍流强度C2n的增大,误码率增加很快;采用长波长的激光进行传输可以有效地降低系统误码率.Based on the systematic study on the laser intensity fluctuation in actual atomspheric turbulance in the situation of complex terrain, it is found that there is great deviation between the actual probabilistic density distribution and theoretical one. From the relationship between luminous intensity fluctuation induced by atomspheric turbulence and error rate, it is shown that in the weak variance condition, intensity variance should be below 0.67 for communication system with BER below 10-9. With turbulence intensity Cn^2 increasing, BER increases rapidly. Communication with long wavelength laser can decrease BER effectively.

关 键 词：大气湍流 光强起伏 误码率 

分 类 号：TP929.1[自动化与计算机技术]