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

LU Jingyue; ZHANG Lei; MENG Zhichao; SHENG Jialian

doi:10.7572/S1000-6893.2019.22745

ACTA AERONAUTICAET ASTRONAUTICA SINICA >

2019 , Vol. 40 >Issue 7: 322745 - 322745

DOI: https://doi.org/10.7572/S1000-6893.2019.22745

Electronics and Electrical Engineering and Control

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

LU Jingyue ,
ZHANG Lei ,
MENG Zhichao ,
SHENG Jialian

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1. National Key Lab of Radar Signal Processing, Xidian University, Xi'an 710071, China;
2. Shanghai Radio Equipment Research Institute, Shanghai 200090, China

Received date: 2018-10-19

Revised date: 2018-12-01

Online published: 2019-07-24

Supported by

National Natural Science Foundation of China (61771372,61771367); Natural Science Foundation of Shanghai (16ZR1434900)

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Abstract

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.

Key words： forward-looking imaging; Synthetic Aperture Radar (SAR); curve trajectory; Doppler ambiguity relation; sub-aperture; beam-forming

Cite this article

LU Jingyue , ZHANG Lei , MENG Zhichao , SHENG Jialian . Unambiguous imaging for forward-looking synthetic aperture radar on curve trajectory[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2019 , 40(7) : 322745 -322745 . DOI: 10.7572/S1000-6893.2019.22745

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