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.