基于扑翼模型的鸟类目标动态RCS的仿真研究

提出了一种研究扑翼飞行鸟类的动态雷达散射截面(RCS)仿真方法。结合鸟类飞行中的3种典型扑翼姿态建立了对应的CAD模型,并基于FEKO计算了每种姿态的全空域静态RCS数据。建立了叠加位置扰动的鸟类飞行航迹模型,解算出雷达视线在目标坐标系中的视线角,计算鸟的扑翼频率,得到扑翼姿态随时间变化的序列。最后对全空域静态数据进行线性插值获得所需的RCS。仿真结果表明:鸟正侧方的动态RCS要大于前侧方和后侧方的RCS;考虑鸟扑翼的RCS比没有考虑扑翼的RCS振荡更加剧烈。该方法为研究雷达鸟类目标动态特性提供了参考。

Simulation of Bird's Dynamic RCS Based on Flapping Wing Model

A method of simulating bird''s dynamic RCS were proposed, based on the flapping wing model. First of all, three typical flapping wing bird CAD models were built, and the static RCS on all air-space of each model were calculated by FEKO. The flight path was set adding location disturbance, the aspect angles of radar in target body coordinate and the bird''s flapping wing attitudes series were obtained, and the RCS were found out by liner interpolation. The result shows that: the dynamic RCS in side is higher than that of in front and back, and the RCS considering flapping wing has obvious os- cillation. The method offers beneficial reference to the study of dynamic characteristics of birds.