猫眼终端回波闪烁效应分析

Analysis of cat-eye terminal echo flashing based on the modified Rytov method

利用Rytov近似和物理光学传输矩阵法,研究了猫眼光学系统离焦量对逆向通信系统中猫眼终端回波闪烁效应的影响,得到了水平传输时高斯波束在接收平面的闪烁指数的表达式,通过数值仿真实验分析了猫眼光学系统的离焦量对接收平面光强闪烁指数的影响。结果表明,无论湍流和传输距离如何改变,总是存在一定的离焦量使得闪烁指数最小;离焦量增大时闪烁指数总体呈现先减小后增大的趋势,且随着距离和湍流的增大闪烁指数也增大。

The effects of cat-eye lens defocus amount on the intensity scintillation index of the active probing light of cat-eye terminal in modulating retro-reflecting free space optical communication system has been researched with of the Rytov approximation method and physical optical transmission matrix method. Theoretically, the expression of the scintillation index on receiving plane on condition of the Gaussian beam horizontal transfer through atmospheric condi- tions has been obtained. Numerical simulation results demonstrate that there is always a certain defocus amount to make the smallest scintillation index no matter how the turbulence and the distance change. With the increasing of the defocus amount, the index decreases first and then increases. In addition, the index increases with the increasing of the distance and turbulence.