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Open AccessArticle

Sub-Aperture Partitioning Method for Three-Dimensional Wide-Angle Synthetic Aperture Radar Imaging with Non-Uniform Sampling

1
State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System, National University of Defense Technology, Changsha 410073, China
2
College of Electronic Science, National University of Defense Technology, Changsha 410073, China
*
Author to whom correspondence should be addressed.
Electronics 2019, 8(6), 629; https://doi.org/10.3390/electronics8060629
Received: 28 April 2019 / Revised: 2 June 2019 / Accepted: 2 June 2019 / Published: 3 June 2019
(This article belongs to the Section Microwave and Wireless Communications)
For a three-dimensional wide-angle synthetic aperture radar (SAR) with non-uniform sampling, it is necessary to divide its large aperture into several small sub-apertures before imaging due to the anisotropic characteristics of the target. The existing sub-aperture partitioning methods divide the aperture with equal intervals. However, for the non-uniformly sampled SAR, those equal-interval partitioning methods may have a bad effect on the resolution of the SAR imaging result. In view of this, a sub-aperture partitioning method for three-dimensional wide-angle SAR imaging with non-uniform sampling was proposed in this paper. First, we analyzed the relationship between the three-dimensional resolution and the sampling distribution in K-space based on the Cramer–Rao lower bound. Subsequently, according to the distribution of K-space sampling, the optimum size of each sub-aperture was found and the aperture was divided non-uniformly. Furthermore, the proposed method was validated by electromagnetic simulation data. The proposed sub-aperture partitioning method ensured that the resolution of each sub-aperture was high and consistent. By comparing with the equal-interval partitioning method, the experimental results showed that our proposed method had a higher resolution imaging result. View Full-Text
Keywords: sub-aperture partitioning; non-uniform sampling; wide-angle synthetic aperture radar (SAR); three-dimensional resolution sub-aperture partitioning; non-uniform sampling; wide-angle synthetic aperture radar (SAR); three-dimensional resolution
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MDPI and ACS Style

Sun, D.; Xing, S.; Li, Y.; Pang, B.; Wang, X. Sub-Aperture Partitioning Method for Three-Dimensional Wide-Angle Synthetic Aperture Radar Imaging with Non-Uniform Sampling. Electronics 2019, 8, 629.

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