非合作目标动态RCS仿真方法

Simulation Method of Dynamic RCS for Non-cooperative Targets

针对非合作目标难以开展动态测量的问题,根据空气动力学原理提出了一种非合作目标动态雷达散射截面(RCS)仿真方法。该方法首先建立测量背景下典型飞行航路模型,然后计算雷达视线在机体坐标系上的时变姿态角。根据姿态角开展电磁计算,获得F-117A隐身攻击机在侧站平飞、背站拉起、对站俯冲、侧站盘旋4种航路下的动态RCS数据。着重分析了动、静态RCS特性在起伏目标检测性能评估上的差异。结果表明:静态RCS特性难以反映目标运动时真实的雷达特性,利用静态数据描述目标特性可能导致错误结论,而文中方法获取的动态RCS数据可以提高结论的完整性和可信度。

It is hard to implement dynamic measurements of non-cooperative targets.A simulation method of dynamic radar cross section （RCS） is proposed in this paper in accordance with aerodynamic theory.After a typical track model of the dynamic measurement is built,the real-time attitude angle of the radar line of sight is calculated in the target coordinate system.The dynamic RCS data of an F-117A stealthy attacker under typical tracks are obtained using the attitude angle by means of electromagnetic calculation.Typical tracks included level flight,pull up,dive and circling,which made up most of the flight situations in a real case.The differences between dynamic and static RCS characteristics for the evaluation of the detection ability of fluctuating targets are analyzed.The results show that it is hard for static data to reflect true radar characteristics when a target is moving; using static data to describe target characteristics may lead to false conclusions.The method in this paper can enhance the integrity and confidence level of RCS analysis conclusions.