激光大气传输接收功率闪烁的概率分布特征

在大气激光通信、激光测距、激光制导等应用中,由于大气湍流引起的接收光功率起伏对其工作效果及稳定性都有很大的影响。通过多相屏傅里叶数值模拟方法模拟了准直高斯光束在湍流大气中的传输,在考虑孔径平均效应的基础下,比较了弱起伏条件、中等起伏条件和强起伏条件下对数正态分布、Gamma-Gamma分布、指数威布尔分布和威布尔分布对仿真数据的拟合,分析得到弱起伏条件到强起伏条件下激光大气传输接收功率闪烁的概率分布服从指数威布尔分布,且该分布具有概率密度函数和累积分布函数结构简单、参数可以由大气参数计算得到的优点,为提高激光大气传输应用技术的性能提供了参考。

Probability distribution of irradiance fluctuation in laser atmospheric transmission

The irradiance fluctuation caused by the atmospheric turbulence has a heavy influence on the beam quality of the laser in the applications of laser communications,laser ranging and laser guidance.The transmission of a collimated Gaussian beam in atmospheric turbulence under aperture averaging is simulated by the multiphase screens Fourier transform method.By comparing log-normal distribution,Gamma-Gamma distribution,exponentiated Weibull distribution and Weibull distribution,it is found that the exponentiated Weibull distribution fits the simulation data best,and has advantages that the probability density function and cumulative distribution function are simple and the parameters can be calculated by atmospheric parameters.This provides a reference for the applications of laser atmospheric transmission.