Point Spread Function Analysis for BSAR With GNSS Transmitters and Long Dwell Times: Theory and Experimental Confirmation
Point Spread Function Analysis for BSAR With GNSS Transmitters and Long Dwell Times: Theory and Experimental Confirmation
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DOI：
10.1109/lgrs.2012.2223655
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发表时间：
2013-07-01
影响因子：
4.8
通讯作者：
Cherniakov, M.
中科院分区：
文献类型：
--
作者：
Liu, F.;Antoniou, M.;Cherniakov, M.
本文对发射机位于中地球轨道、接收机固定在地面的双基地合成孔径雷达（BSAR）系统进行了点扩展函数（PSF）分析。为了在这样的配置下实现合理的方位分辨率，卫星的轨迹不能再近似为直线;因此，用于PSF分析的当前方法是不足的。提出的解决方案涉及广义模糊函数的扩展，以适应卫星轨道曲率。理论分析表明，不同于在单基地，甚至一般的BSAR观察到的效果，并验证了仿真和实验结果使用导航卫星作为发射平台。
This letter conducts a point spread function (PSF) analysis for bistatic synthetic aperture radar (BSAR) systems where the transmitter is in medium Earth orbit, and the receiver is fixed on the ground. To achieve a reasonable azimuth resolution under such a configuration, the trajectory of the satellite can no longer be approximated as a straight line; therefore, current methods for PSF analysis are insufficient. The solution proposed involves extension of the generalized ambiguity function to accommodate satellite trajectory curvature. The theoretical analysis shows effects unlike those observed in monostatic or even the general BSAR and is verified by both simulation and experimental results using navigation satellites as the transmitting platforms.