Abstract: Wide-band scattering characteristics of typical spin stabilized satellite and triaxial stabilized satellite are computed by using finite-difference time-domain (FDTD). Compacts of the attitudes on scattering properties are investigated. The scattering properties of typical satellite targets in frequency domain are compared with the scattering properties in time domain. The results show that the satellite scattering properties in frequency domain are propitious to get the large-scale attitude information and the properties in time domain are propitious to get the small-scale attitude information. In addition, the change of rolling attitude more easily arouses the variety of scattering characteristics of typical satellite target than pitch attitude change does. The conclusions are valuable to the attitude identification of satellite and the design of ground based wide-band radar.

Key words: satellite attitude, FDTD, wide-band scattering

摘要： 采用FDTD方法计算和分析了现有的两类典型的卫星--三轴稳定和自旋稳定卫星的宽带散射特性，比较了这两种典型卫星目标的时域和频域散射特性随姿态变化的规律。结果显示频域散射特性适合在大姿态角变化范围内分析卫星目标姿态，而时域散射特性适合在小姿态角变化情况下分析卫星目标姿态。此外，对于典型卫星目标而言，翻滚姿态变化比俯仰姿态变化可以引起更大的目标后向散射变化。计算分析结果对卫星目标及其姿态的识别，以及对宽带地基雷达的设计有一定的参考价值。

关键词: 卫星姿态, FDTD, 宽带散射