VHF频段隐身目标缩比模型的雷达散射截面测量

摘要

This paper describes measurement of radar cross section （RCS） for scale model of stealth targets under horizontal（H） or vertical（V）-polarization transmitreceive conditions （including HH, HV, VV and VH） in the very high frequency （VHF） band. Analysis process of the RCS measurement is introduced, in which the background clutter cancellation and windowing in time-domain are adopted to reduce the measurement error in lower frequency band. Results of scale models for two stealth targets are given, which show that the RCS is on the order of squared meters, much larger than that in microwave band because of the resonance effect in the lower VHF band, and in some frequent points, the RCS of cross-polar component even stronger than co-polar component. It provides a theoretical basis for designing modern radar with the ability to detect stealth targets by adopting the stealth target resonant in frequency domain and the polarization characteristic in polarization domain.%介绍了甚高频（VHF）频段、工作在水平（H）或垂直（V）极化发射一接收组合（即HH、VV、HV、VH）情况下隐身目标缩比模型的雷达散射截面积（RCS）测量方法；给出了低频段RCS测量与计算的详细过程，采用背景杂波对消和时域加窗处理的方法减少了低频段RCS测量的误差；并给出了两种隐身目标缩比模型的RCS测量结果。测量结果表明：由于谐振效应，在VHF下端的低频段，隐身目标的RCS在平方米的量级，远大于在微波段的测量值；在部分频点，交叉极化的RCS甚至比同极化还强。这为利用隐身目标在频率域的谐振效应和极化域的极