用模式叠加法计算进气道雷达散射面积

基于导波模式理论，将进气道复杂终端分成若干个等效终端，提出了用模式叠加法计算飞机进气道的内部雷达散射面积，推导了部分典型等效终端的数学模型，通过计算结果与相关文献实验数据对比表明该方法基本可行。该方法的特点是极化散射矩阵和终端反射系数可分解后分别计算，便于叠加各种进气道构型和不断积累计算模型。

Calculation of RCS of Intake by Means of Mode Superposition

In this paper, a calculation method of the jet engine inlet on radar cross section (RCS) is introduced by means of mode superposition on the basis of the traditional waveguide mode theory. The key of this method is to separate a complex terminal into some simple terminals, and to calculate separately the waveguide mode reflectance and polarization scattering matrix of each simple terminal. Then, RCS of a complex inlet can be calculated by the mode superposition of reflectance and polarization scattering matrixes. The advantage of the method is that a complex mode can be easily piled up by many simple modes and various inlet modes can be superposed conveniently.