星载平面SAR卫星RCS特性研究

A Study on RCS Characterization for Space-borne Plane SAR

对星载合成孔径雷达(SAR)卫星结构精细估计是空间态势感知的主要内容,阵元间距的估计更是关注的重点。在微带星载SAR间距研究基础上,开展了波导裂缝SAR卫星电磁仿真和间距估计,利用SAR卫星不同倾斜角下的雷达散射截面(RCS)空间不变性,采用球体空间距离实现了倾斜角未知条件下的阵列间距估计。对多颗SAR卫星实测数据分析表明方法可靠可行,研究获得的RCS身份密码有助于提高SAR卫星识别和精细结构估计能力。

It is one of the main tasks of the space situational awareness to estimate the structure of space-borne SAR satellite,especially the estimation of array element distance.On the study of microstrip antenna SAR,the electromagnetic simulation and the estimation of array element distance in slotted waveguide antenna SAR satellite are carried out.Based on the spatial invariance of RCS at different tilt angles of SAR satellites,using the sphere space distance calculation method,we realize the element distance estimation with the unknown inclination angle.The measured data of multiple SAR satellites shows that the method is reliable and feasible,the RCS identity code is helpful to improve the identification and fine structure estimation ability of SAR satellite.