SAR导引头中制导地面场景RCS计算

Ground Scene RCS Calculation in Middle Section Guidance of SAR Guiding Unit

针对SAR导引头中段匹配制导中地面场景RCS的计算,综合了现有利用数字高程图(DEM)的SAR图像模拟方法,归纳了SAR导引头中制导地面场景RCS系统的计算步骤和实现方法。该方法首先得到数字高程图数据,再利用分形插值和小平面单元模型对数字高程图数据进行处理,然后结合RCS经验模型计算出地面场景的RCS。该方法步骤详尽、流程清晰,直接适合计算机仿真。针对文中归纳的RCS系统的实现方法,结合地面场景RCS仿真流程,进行了仿真实验,实验结果验证了该方法的有效性,实用性。进而为SAR导引头的目标回波模拟提供了一定的理论依据。

In accordance with the ground scene RCS calculation in the middle section matching and guidance of SAR guiding unit,this paper concludes the simulation methods for SAR image based on DEM（digital elevation map）,and then gives the systemic steps and method of the ground scene RCS calculation of the middle section.First,it obtains the DEM data,deals with the data using fractal theory and facet model,and then calculates the ground scene RCS with suitable experience model.The method has systemic steps and legible process,it needn＇t any change for computer simulation.For the method proposed in this paper,the simulation experiment is made according to the simulation steps given in the paper.The simulation result verifies the effectiveness of the method.This paper provides some theory basis to get the simulation echo scattering coefficient of SAR guiding unit.