金属球目标雷达成像特性分析

Radar Imaging Characteristics of Metallic Spheres

在金属球后向电磁散射精确解的基础上对其复雷达散射截面(复RCS)的幅度和相位特点进行了分析。金属球距离像在低频段呈现大小悬殊的2个尖峰,在高频段仅出现1个尖峰,其二维像在不同转角和频段下呈现出圆弧或点的特征。指出不同条件下金属球应当用色散、滑动或理想点散射中心模型进行描述。所揭示的金属球雷达成像特性对于RCS测量定标和散射源诊断分析具有参考价值。

The amplitude and phase characteristics of complex radar cross section （RCS） of a metallic sphere are analyzed based on the precise solution of its back scattering. The high resolution range profile of a sphere takes on one or two peaks at different bands, while its 2D image can be typified by an arc or a point at different bands and rotation angles. A sphere should be characterized by a dispersive, migratory or point-like scattering center model under different conditions. These conclusions may provide an important reference for RCS calibration and scattering source diagnosis.