A Modified Equivalent Range Model and Wavenumber-Domain Imaging Approach for High-Resolution-High-Squint SAR With Curved Trajectory

被引：53
作者：
Li, Zhenyu [1 ,2 ,3 ]
Xing, Mengdao [1 ,2 ]
Xing, Wenjie [4 ]
Liang, Yi [1 ,2 ]
Gao, Yuexin [1 ,2 ]
Dai, Baoquan [1 ,2 ,3 ]
Hu, Liangbing [1 ,2 ,3 ]
Bao, Zheng [1 ,2 ]
机构：
[1] Xidian Univ, Natl Lab Radar Signal Proc, Xian 710071, Peoples R China
[2] Xidian Univ, Collaborat Innovat Ctr Informat Sensing & Underst, Xian 710071, Peoples R China
[3] Nanjing Res Inst Elect Technol, Nanjing 210039, Jiangsu, Peoples R China
[4] Xian 1 High Sch, Int Campus, Xian 710119, Peoples R China
来源：
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING | 2017年 / 55卷 / 07期
基金：
中国国家自然科学基金;
关键词：
Curved trajectory; high-resolution-high-squint (HRHS) synthetic aperture radar (SAR); modified equivalent range model (MERM); wavenumber-domain imaging; CHIRP SCALING ALGORITHM; MISSILE-BORNE SAR;
D O I：
10.1109/TGRS.2017.2678763
中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
In a synthetic aperture radar (SAR) system, the radar platform may move with a curved trajectory due to the existence of vertical velocity and acceleration, which may result in the failure of the conventional imaging methods. In order to deal with this problem, this paper proposes an improved wavenumber-domain imaging algorithm for high-resolution-high-squint SAR with a curved trajectory. It mainly includes three aspects. First, a modified equivalent range model for a curved trajectory is derived. Second, an improved wavenumber domain imaging algorithm based on the proposed range model is analyzed in detail. Finally, the imaging distortion caused by vertical velocity and acceleration is corrected via geometry and inverse projection. Simulated results and Ku-band real SAR data processing are used to validate the proposed model and imaging algorithm.
引用
收藏
页码：3721 / 3734
页数：14
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