在大气无线光通信中, 大气中的雾滴会导致激光信号严重衰减, 从而使得脉冲信号的时间展宽和能量衰减。应用蒙特卡洛多次散射模型对1.064 μm激光脉冲在雾中的传输特性进行了数值模拟。在模拟中, 基于米氏散射理论, 计算出了光在不同雾能见度下的散射相函数值, 并通过随机抽样方法得到了随机数与散射角的对应关系。与采用H-G相函数近似表示粒子对光的米氏散射特性的方法相比, 这种方法更精确。在此基础上, 模拟了不同雾环境和接收视场角下激光信号的脉冲响应特性。

In atmospheric wireless optical communication, the droplets in atmosphere may cause laser signals to attenuate severely, thus resulting in the attenuation of the temporal spread and energy of pulse signals. A Monte Carlo method is used to simulate the transmission of 1.064 μm laser pulses in fog. In the simulation, the scattering phase function values of light in the fog with different visibility are calculated according to the Mie scattering theory. The corresponding relationbetween the random number and the scattering angle is obtained through random sampling. Compared with the method in which the H-G phase function is used to represent the Mie scattering characteristics of particles to light approximately, this method is more accurate. On this basis, the impulse response characteristics of laser signals at different receiving view angles under different fog environment are simulated.