A Cavity RCS Measurement Method Based on Microwave Imaging Extraction

Abstract

The cavity scattering brought by the inlet is an important scattering source of the stealth UAV, so obtaining the scattering characteristics of the cavity target in the installed state is an important topic for the stealth performance test of the UAV. After installation, the cavity target is wrapped inside the aircraft, and its outer surface does not produce scattering contribution. In order to effectively eliminate the scattering from the external surface of the cavity and obtain the accurate scattering characteristics inside the cavity, the algorithm of microwave imaging reverse RCS is applied to the test of the cavity in this paper. After the cavity is imaged by ISAR, the method removes the strong scattering region of the outer wall of the cavity, so as to obtain a new ISAR image. Moreover, it integrates the new ISAR image to obtain the echo information inside the cavity under the installed state. The simulation results show that this method can effectively eliminate the scattering from the outer wall of the cavity and evaluate the inlet RCS of UAV at large incident angle.