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 sing