RCS测量中目标与金属支架间的耦合散射研究

In radar cross section (RCS) measurement using a low RCS metal pylon, the effect of interactions between the target under test and the metal pylon might be a significant factor degrading the accuracy of measurement data. In this paper, a squat cylinder calibrator which is widely used in RCS measurement and a wing-typed stealth aircraft model are respectively taken as the targets under test. The two major mechanisms of the target-pylon coupling scattering, i.e., the surface wave type and the multiple reflection type are studied. Using one-dimensional high-resolution range profiling, time-frequency analyzing and two-dimensional inverse synthetic aperture radar imaging, the coupling scattering mechanisms between different targets and metal pylon are analyzed. Methods for coupling scattering suppression are proposed. Numerical calculation and simulation results are presented to demonstrate the usefulness of the proposed techniques.