基于蒙特卡罗方法的隐身飞行器LRCS特性研究

Research of stealthy aircraft's LRCS characteristic based on the monte carlo method

针对激光雷达散射截面(Laser Radar Cross Section,LRCS)面元数量巨大、构造复杂、难以实现面积计算的难题,采用蒙特卡罗方法快速计算3DMAX高仿真隐身飞行模型各面元面积,结合双向反射分布函数,得到了飞行器的LRCS。就机腹照射和机背照射的LRCS进行了对比分析,结果表明:由于飞行器气动外形特点,飞行器腹部较为平整,而飞行器背部由于安置座舱、尾翼等原因,更可能使激光雷达接收到较强的散射光功率。

In order to solve the LRCS acreage calculation problem with numerous and complex cells, this paper introduced Monte Carlo method and BRDF. The LRCS simulation included two situations： one is the laser irradiating from the bottom of aircraft, the other is laser irradiating from the top of aircraft. The result shows that： the lidar can receive more scatter energy in latter situation than that in the former situation.