大气信道仿真代码，仿真大气信道在不同天气对激光信号的衰减情况有关；单球雨粒子的散射计算；用MIE散射理论，计算单球粒子对平面光波的散射(The simulation code of atmospheric channel emulation the attenuation of the laser signal in different weather, the calculation of the scattering of single ball of rain particles, and the calculation of the scattering of a single spherical particle to the plane light wave by MIE scattering theory.)