基于扫频时域法测量的RCS外推技术研究

大目标的室内RCS测量不易满足远场条件,外推技术可将测试距离大幅度缩短,从而克服此缺陷。针对点频连续波方法测试RCS精度很有限,致使外推结果精度不高,本文提出基于扫频的时域法RCS外推技术。扫频测试能得到高精度的时域测试数据,通过对时域数据进行有效的变换,获取准确的频域幅相信息,从而外推出较高精度的远场RCS,实现大目标的RCS测量。通过对金属圆柱的测试,验证了该技术的优越性。

Investigation on RCS Extrapolation Technique Based on Time-Domain Method

Indoor RCS measurement of large target is hard to meet the far-field condition, however,extrapolation technique can overcome the disadvantage by shortening the required distance greatly.The CW RCS measurement technique has a limited precision,which affects the extrapolating results indirectly.In this paper,a new extrapolation technique based on time-domain method by frequency-sweeping measurement is put up.By processing RCS data on time-domain effectively,accurate frequency-domain RCS information can be obtained,and then be extrapolated into far-field RCS pattern.Thus the RCS measurement of large target is realized.Measurement results of a cylinder show the advantages of the new technique.