物理光学迭代法计算任意形状开口腔体RCS:本文首先介绍了物理光学迭代法(IPO)的基本原理，并用此方法计算了简单无遮挡开口腔体的RCS。在此基础上，引进遮挡判断原则，计算了任意复杂形状开口腔体的RCS。关键词： 电磁散射物理光学迭代法 遮挡效应 雷达散射截面Abstract: The principle of iterative physical optics(IPO) algorithm was introduced，in which open-ended waveguide cavities were analyzed. then the the shadowing effect was combined with iterative physical optics(IPO) algorithm,,then the absolute shape open-ended waveguide cavitity can be caculated.Keywords: Electromagnetic scattering，iterative physical optics，the shadowing effect, radar cross sections.在飞行器RCS分析中，进气道等开口腔结构的计算一直是一个难点。F.Obelleiro等提出了物理光学迭代法是分析结构复杂且尺寸电大的开域凹型目标的腔体电磁散射特性的行之有效的高频近似方法，它不但能有效模拟目标对电磁波的多次反射，而且物理思路清晰，迭代过程简单，不需矩阵求逆，便于计算机编程实现。