一种埋入式腔体的低RCS载体外形设计

Low RCS Supporter Shape Design for Embedded Cavities

根据腔体目标在较大方位角内有较强散射的特点,提出了包覆腔体载体的设计要求。设计了大后掠扁平式后段收尖的载体初步方案。通过头部边缘锐化、头部边缘后掠角增加和对尾部边缘渐变半径处理,获得了符合载体设计期望的"凹坑式"雷达散射截面(RCS)随方位角曲线分布。研究结果显示,在水平极化时,尾部边缘采用渐变半径圆弧过渡曲面可以有效降低边缘散射在入射方向的回波,而在垂直极化时却增强了表面波回波强度。

The requirements of supporters used for embedded cavities are given in light of the electromagnetic scattering behavior that Radar Cross Section（RCS） values of cavities are relatively high in a wide angular region.The preliminary supporter is designed as a large sweepback,flat,pointed-end shape.By sharpening the leading edge,enlarging the sweep angle of the leading edge,reshaping the trailing edge,a desirable ＂bucket-shaped＂RCS distribution with respect to azimuth is achieved.Results show that in horizontal polarization backward scattering of diffraction of edges can be reduced by means of modifying the trailing edge as curved transition surface with gradually varied radius,while the backward scattering from the return waves of surface waves is increased in vertical polarization.