【作者】 孙稚超； 安洪阳； 李中余； 黄钰林； 杨建宇；

【Author】 Zhichao Sun;Hongyang An;Zhongyu Li;Yulin Huang;Jianyu Yang;University of Electronic Science and Technology of China;

【机构】 电子科技大学；

【摘要】 本文针对高低轨多基地SAR系统开展了研究,首先给出其系统组成。并从成像性能、波束覆盖和系统特性等方面分析了系统优势。然后,分析高低轨多基地SAR系统的空间分辨率及其影响因素,仿真分析表明,引入低轨SAR卫星作为接收站可以显著提高系统的成像性能。随后,提出了基于椭圆支撑域的高低轨多基地SAR空间分辨率衡量准则,并给出了分辨率增强方法。分析了低轨接收站采用滑动聚束和TOPS等成像模式时回波频域特性。最后,指出了高低轨多基地SAR在成像中的若干问题与挑战,包括多普勒模糊问题以及二维空变问题,为高低轨多基地SAR的研究提供了理论基础。更多还原

【Abstract】 In this paper,the Geosynchronous-LEO spaceborne multi-static SAR(GEO-LEO MSSAR) system is studied.First,the system composition is given and the advantages of the system are analyzed in terms of imaging performance,beam coverage and system characteristics.Then,the spatial resolution and its influencing factors are analyzed.The simulation results show that introducing the LEO SAR satellite as the receiving station can significantly improve the imaging performance of the system.Subsequently,the spatial resolution measurement criterion of GEO-LEO MSSAR based on elliptical support domain is proposed,and the resolution enhancement method is given.The echo frequency domain characteristics of LEO receiver with sliding spotlight and TOPS imaging modes are analyzed.Finally,some problems and challenges in the imaging of GEO-LEO MSSAR are pointed out,including Doppler ambiguity and two-dimensional space-variance,which provide a theoretical basis for the research of GEO-LEO MSSAR.更多还原