基于二维微波成像的共形天线RCS提取方法

二维微波成像技术是一种有效诊断雷达目标散射点强度和空间分布的手段。机载共形天线因与机体表面成为一体，常规测试手段难以确定其RCS贡献。基于二维微波成像技术，分离和提取出了装机状态下共形天线的反射率分布，通过二维空间像与二维空间谱之间的波谱变换获得了共形天线的二维空间谱信息，经过直角坐标域至极坐标域的插值获得了对应频率和角度的散射信息，再对定标球进行同样的处理，最终标定出共形天线的RCS贡献。实验结果表明了该技术的有效性。

Extracting RCS of conformal antenna based on 2-D microwave imaging

2-D microwave imaging is an effect method to diagnose the amplitude and spatial distribution of radar scatters. Conformal antenna as a part of plane-skin, its radar cross section (RCS) can not be measured by general RCS measurement method. A new method was presented to extract the scattering characteristic of conformal antenna from 2-D microwave image of target, by spectrum transforming from 2-D image domain to 2-D spatial spectrum domain, spatial spectrum information of conformal antenna can be extracted, and scattering characteristic of target at certain frequency and angle can be gained by interpolating data form descartes coordinate system to polar coordinate system. The same processing to a reference sphere, by scale calibrating, then the RCS of conformal antenna can be achieved accurately. Experiment results show that the method is effective.