基于一阶多重散射近似的激光引信雨滴回波模拟

Simulation of Laser Fuze Echo from Rain Based on First-order Multiple Scattering Approximate Method

首先对雨粒子光学特性参数(平均反照率、消光系数、吸收系数、不对称因子、相函数等)进行建模和计算。基于一阶多重散射近似理论建立回波雷达方程,构建时域回波与入射脉冲(时间与空间分布)、粒子光学特性参数、引信参数之间的关系模型。通过改变雷达基线、孔径面积、波束发散角、脉宽以及消光系数、不对称因子等参数对激光引信回波进行仿真,并对其进行分析。

Firstly, moeleling and computation process of optical parameter of rain particles, such as averaged albedo, extinction coefficient, absorption coefficient, asymmetry factor, phase function are given. Then the echo radar function is established based on the firstorder multiple scattering approximation, which makes connection of time domain echo to incident pulse, optical parameters of particles and fuze parameter. Simulation and analyses are implemented according to different conditions, such as radar baseline length, aperture area, pulse width, radiation angle, etc.