平面埋入式进气道的电磁散射特性

 对一种平面埋入式进气道在Ku波段选择入射频率15 GHz情况下进行了电磁散射特性的实验和仿真研究，取得了平面埋入式进气道雷达散射截面（RCS）随方位角、迎角和终端的变化规律。研究结果表明: (1)平面埋入式进气道布局的导弹模型在水平极化终端为风扇时±60°RCS均值为-27.42 dBsm，垂直极化为-28.50 dBsm是一种隐身方案；(2)迎角变化对埋入式进气道RCS的影响不大，在-5°~10°的迎角范围内RCS均值的变化不大于4 dB；(3)运用时域有限差分法(FDTD)计算所得的RCS随方位角变化曲线与实验曲线趋势基本一致，±60°均值误差在1 dB左右。

Electromagnetic Scattering of a Submerged Inlet

This article presents the electromagnetic scattering of a plane submerged inlet at 15 GHz in Ku wave band. The radar cross section (RCS) characteristics of the submerged inlet at different azimuth, attack angle and terminators have been obtained. The results indicate that: (1) The average RCS of the submerged inlet missile model with a fan terminator at ±60°azimuth has -27.42 dBsm in horizontal polarization, and -28.50 dBsmin vertical polarization, which means that the submerged inlet is a stealth arrangment; (2) The RCS of the submerged inlet is not sensitive to atttack angle. When the attack angle is shifted from -5° to 10°, the variation of the average RCS of the inlet is less than 4 dB; (3) The RCS curve of the finite difference time domain (FDTD) numerical simulation at different aspect angles is basically in accord with the experiment results. The difference of the average RCS at ±60°azimuth between experiment and computation is around 1 dB.