复杂目标散射中心建模的修正

Modification of complex target scattering center modeling

实际雷达目标的散射中心属性非常复杂,如不规则的几何结构、遮挡,均会增加散射中心精确建模的难度。现有的散射中心模型并未考虑这些实际问题,为了提高建模精度,需对现有模型进行合理修正。对散射中心模型中的频率依赖项、不规则平面的反射、局部遮挡造成的散射强度变化问题,给出了具体的修正方法。通过数值验证,证实了修正模型模拟复杂目标雷达散射截面起伏特性、雷达距离-方位图像以及时频像特征的精确性。

The scattering of actual radar targets is complex. Irregular shape and shielded structure increase the difficulty of scattering center modeling. The existing scattering center models do not consider these practical problems. In order to achieve higher modeling accuracy, the scattering center model needs to be modified. This paper gives specific modification methods for influence of the frequency dependence term of the scattering center model and the scattering intensity variation caused by irregular plane and shielded structure. Through numerical verification, the accuracy of the modified model in simulating the fluctuation characteristic of radar cross section of the complex target, two dimensional radar image and timefrequency representation characteristics is confirmed.