大气湍流对复杂路径下光强起伏及误码率的影响

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,而由大气湍流引起的光强起伏和系统误码率的关系,结果表明: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Cn2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.

Atmospheric Turbulence Effects on the Luminous Intensity Fluctuation and Error Rate under the Complex Way

Based on the study of laser atmospheric turbulence in the situation of complex terrain, we found that there is a great departure between the varianee intensity and the probability density. The result indicated that in the weak variance condition, intensity variance should be below 0.67 for communication system with BER below 10^-9, and with turbulence intensity Cn^2 increasing, BER increased rapidly, and by adopting laser with longest wave to communication BER can be decreased effectively.