斜程大气湍流中漫射目标的散射特性

根据推广的惠更斯-菲涅尔原理及ITU-R大气结构常数模型(2001年国际电信联盟提出的随高度变化的大气结构常数模型)，考虑了大气湍流对激光从发射机到目标和从目标到接收机双程路径的影响，研究了大气湍流中漫射目标的激光波束散射问题，导出了考虑对数振幅起伏和相位占优情况下在斜程大气湍流中传输时激光波束散射场的互相关函数、强度协方差和强度方差的计算公式，并给出了数值计算结果.数值分析了波长、接收机高度和传播距离对强度协方差和归一化强度方差的影响. 关键词： 激光散射 斜程湍流 强度方差 强度协方差

Scattering from a diffuse target in the slant atmospheric turbulence

Based on the extended Huygens-Fresnel principle and ITU-R atmospheric turbulence model (the altitude-dependent model proposed by International Telecommunication Union-Recommendation in 2001), the treatment includes the effect of the atmospheric turbulence both on the laser beam as it propagates to the target and on the scattered field as it propagates back to the receiver. The covariance function and variance of the scattering intensity are derived considering the fluctuations of the log-amplitude and phase, and the numerical results are presented. The influences of wavelength, receiver altitude and propagation distance on the covariance function and normalized variance of the scattering are discussed.