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视频合成孔径雷达(SAR)作为一种新型的微波遥感体制,能够实现热点区域的持续监测。文中提出了一种基于GEO-LEO双站模式的天基视频SAR系统,其中发射源位于地球静止轨道,低轨卫星顺序接收目标场景回波信号实现对场景的持续视频监测,基于该双站模式建立了回波信号模型;同时,提出了天基视频SAR成像过程中回波数据分割与重叠率的计算方法;最后,分析了该天基视频SAR系统的几何分辨率。文中的研究成果可以为天基视频SAR系统的构建提供参考。
As a new microwave remote sensing system, Video Synthetic Aperture Radar (SAR) can continuously monitor hot spots. This paper presents a space-based video SAR system based on GEO-LEO dual-station mode, in which the transmission source is located in the geostationary orbit, and the LEO satellites sequentially receive echo signals of the target scene to achieve continuous video monitoring of the scene. Based on the dual-station mode At the same time, the method to calculate the echo data segmentation and overlap rate in space-based video SAR imaging is proposed. Finally, the geometrical resolution of the space-based video SAR system is analyzed. The research results in this paper can provide a reference for the construction of space-based video SAR system.