利用频谱合成实现分布式卫星SAR高距离分辨力成像

Distributed Satellites SAR High Range Resolution Imaging Using Spectral Synthesis

在正侧视模式下,以不同视角对同一地域进行观测可获得多组回波数据,通过对多组回波数据的综合处理可提高SAR的距离向分辨力。该文研究了由收发分置平台以不同视角、不同观测模式(正侧视和斜视)对同一地域进行观测获取的多组回波数据,指出由于雷达天线波束中心与卫星垂直轨道面夹角的不同,导致回波信号所处频段的不同;通过对不同频段回波信号的频谱合成可提高距离向分辨力。此外,该文还讨论了分布式卫星SAR 系统的一些参数对频谱合成的影响。

Different data sets relative to the same scene acquired with different view angles can be exploited to improve slant-range resolution of SAR in broadside mode. Distributed satellites SAR is a special kind of SAR system, whose transmitters and receivers are placed separately and work in different mode (broadside mode and squint mode). In this paper, data sets acquired from distributed satellites SAR system is discussed. It points out that, different angles between the radar Line Of Sight (LOS) and the satellite's vertical orbital plane correspond to different bands of the ground reflectivity's spectrum. Therefore, the range resolution can be improved by using combined spectra. In addition, the influence of distributed satellites SAR system's parameters on spectral synthesis is also discussed.