用迭代物理光学法分析导弹的耦合散射效应

An Iterative Physical Optics Approach for Analyzing the Missile's RCS Coupling Scattering Effects

主要介绍用迭代物理光学法(IPO)计算存在散射耦合的导弹雷达散射截面(RCS)。主要原理是用迭代的方法来求解磁场积分方程(MFIE),以求得存在耦合部件的RCS。研究表明,在IPO的计算过程中不仅需要判断入射波的照射面和阴影面,而且要判断互相耦合的散射体之间的可见性,本文给出解决该问题的相应方法。对遮挡问题判断的准确性直接会影响迭代过程的收敛性,同时影响收敛性的因素还有电磁波相对于散射体的反射次数。最后,通过利用IPO方法与PO方法的计算结果的比较,分析导弹的耦合散射效应。

In this article, the iterative physical optical approach （IPO） method is applied to resolve the problem on calculating the radar cross section （RCS） of the complex scattering objects whose components are coupling with each other, such as the empennages of the missile. The principle of the IPO method is to solve the magnetic field integral equation （MFIE） by means of iterativeness so as to obtain the RCS of object with coupling components. According the study on some examples, it is necessary that not only to judge the optical surface and shadow surface of incident rays, but also to estimate the visibility of the coupling objects, and the solution of the problem is given in this article. It is remarkable that the accuracy of judgment on shadow will determine the iterative convergency, however, the times of electromagnetic wave coupling scattering on the scattering objects also takes effects on the iterative convergency. Last, the analysis of the coupling scattering effects on the whole missile＇ s RCS is given here according to the comparison between the calculating results of the IPO method and PO method.