GEO-LEO 双站视频SAR 系统若干问题研究

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。

A Study on Key Technologies of Spaceborne Video SAR System Based on GEO-LEO Bistatic Mode

As a new imaging mode, video synthetic aperture radar (SAR) can provide a continuous surveillance over a region of interest. The paper details an innovative video SAR system based on GEO-LEO bistatic mode, in which the transmitter on the geostationary satellite and the receiver on the low earth orbit (LEO) satellite. The LEO small satellites cover the certain area one by one, thus the system can realize a long time continuous monitoring. The echo model of this system is established. Then, a method of data segmentation and overlapping rate calculation is presented. Finally, the geometric resolution of the spaceborne video SAR system is discussed. These results of the paper could be used as a reference to build a spaceborne video SAR system.