唇口斜切修型对S形进气道RCS影响

采用基于迭代物理光学法与等效边缘电磁流法的雷达散射截面计算程序，分析了水平、垂直两种极化方式下唇口斜切修型对菱形进口S形进气道边缘绕射场及腔体内部散射场的影响。计算结果表明：在水平、垂直两种极化方式下，斜切修型可有效降低边缘绕射场的雷达散射截面，但随斜切角度的增大，其减小幅度降低；正负斜切角度对应的绕射场雷达散射截面分布关于0°探测角对称；斜切修型对腔体内部散射场的影响较小。

Effect of Intake Beveled Modification for Radar Cross- section of S- shaped Inlet

Using the program for calculating the radar cross section （RCS） of cavity based on the iterative physical optic （IPO） method and the equivalent edge currents（ EEC ） method, the effect of intake beveled modification on the edge diffraction and scattering field inside the cavity of the S- shaped inlet with dia- mond intake was analyzed under horizontal and vertical polarization method. The results show that：under the two polarization methods, beveled modification can effectively reduce the RCS of edge diffraction field, however, as beveled angle increases, this reduction gets weakened. The corresponding edge diffrac- tion field RCS distribution under positive and negative beveled modification angle is symmetry about 0° detect angle. Beveled modification has little effect on the inner scattering field of cavities.