Unambiguous imaging for forward-looking synthetic aperture radar on curve trajectory

被引：1
作者：
Lu J. [1 ]
Zhang L. [1 ]
Meng Z. [1 ]
Sheng J. [2 ]
机构：
[1] National Key Lab of Radar Signal Processing, Xidian University, Xi'an
[2] Shanghai Radio Equipment Research Institute, Shanghai
来源：
Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica | 2019年 / 40卷 / 07期
基金：
中国国家自然科学基金; 上海市自然科学基金;
关键词：
Beam-forming; Curve trajectory; Doppler ambiguity relation; Forward-looking imaging; Sub-aperture; Synthetic Aperture Radar (SAR);
D O I：
10.7572/S1000-6893.2019.22745
中图分类号：
学科分类号：
摘要：
The forward-looking Synthetic Aperture Radar (SAR) exists Doppler ambiguity. Under the straight path, since the target is symmetrical about the course, and the fuzzy relationship does not vary with the route, beam forming can be used to perform full-aperture deblurring processing. However, under the curve path, the target position is blurred. The relationship has a vacancy and cannot be fully apogematically deblurred. To solve this problem, this paper analyzes the space-variant characteristics of the target fuzzy relation, and proposes a forward-looking multi-channel SAR anti-fuzzy imaging algorithm based on FBP. First, the sub-aperture is divided. In each sub-aperture, the fuzzy relationship of the target is approximately constant. Each sub-aperture is imaged separately. Then each sub-image is deblurred by beam-forming, and finally the sub-image is merged to obtain the final imaging results. The algorithm effectively solves the influence of the vacancy of the target fuzzy relation under the curve trajectory on ambiguity resolution. The simulation experiments verify the effectiveness of the algorithm. © 2019, Press of Chinese Journal of Aeronautics. All right reserved.
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