宽带雷达弹头目标遮挡效应建模与微多普勒仿真分析

Occlusion Modeling and Micro-Doppler Simulation Analysis of Ballistic Target Based on Wideband Radar

微多普勒特征是弹道导弹目标识别的重要依据。高频雷达体制下,弹头目标与雷达的位置关系直接影响雷达回波生成及后续的微多普勒特征提取,因此必须考虑遮挡效应的影响。首先,使用3D-Max软件对锥体弹头进行几何建模,得到三维网格模型;其次,对于弹头顶点和尾翼散射点,在计算机图形学面消隐算法的基础上,采用平均法向量法进行遮挡判断,得到较为真实的目标仿真回波,对遮挡条件下的弹道目标回波建模与微动特征分析进行了初步探索。仿真结果表明,该方法可以完成弹头目标的遮挡效应建模。

Micro-Doppler feature is an important reference for target recognition of ballistic missile.In high frequency radar system,the position relationship between warhead and radar directly affects the generation of radar echoes and micro-Doppler feature extraction subsequently,so the influence of occlusion effect must be considered.Firstly,the 3D Max software is used to model the geometry of cone warhead,and the 3D mesh model of the warhead target is obtained.Secondly,for the warhead vertex and empennage scatterers,the average normal vector method is used for occlusion judgment on the basis of plane hidden and elimination algorithm from the Computer Graphics,then the more real simulated echoes of target is obtained,which makes a preliminary exploration on echoes modeling and micro-motion characteristics analysis of ballistic targets under the occlusion condition.