湍流大气中星载角反射器阵列回波的闪烁指数

利用Rytov方法结合ABCD传输矩阵理论, 推导了地-空-地双程湍流大气路径中单个角反射器回波在接收孔径平面上的强度协方差函数及闪烁指数公式. 根据角反射器阵列的各角反射器单元回波相位相互独立假设, 计算了接收孔径平面上的强度协方差函数、孔径平滑因子和闪烁指数, 比较分析了单个角反射器与角反射器阵列回波闪烁指数. 证明角反射器阵列不改变闪烁指数, 但大气湍流会引起光强起伏放大两倍的规律. 关键词： 大气光学 角反射器阵列 闪烁指数

Scintillation statistics of a retro-reflected wave from space*

Rytov theory combined with the ABCD ray matrix is used to analyzes the statistical property of a reflected wave from a retro-reflector caused by atmospheric turbulence. The covariance function and the scintillation index of the receiving field caused by the combined effect of the turbulence and the random shaking of the reflector array are deduced on the basis of the mutual statistical independence of the two kinds of effects. The aperture factor and the scintillation of a receiving aperture with a finite size are calculated, and those of the retro-reflector and the array are compared to prove that the array does not change distribution of the intensity fluctuation but amplifies the fluctuation by a factor of 2.
Keywords： atmospheric optics retro-reflector array scintillation index