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A novel range ambiguity resolving approach for high-resolution and wide-swath SAR imaging utilizing space-pulse phase coding

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SIGNAL PROCESSING 2020年 168卷 107323-000页

作者： Wang, Hanbing Zhang, Yuhong Xu, Jingwei Liao, Guisheng Zeng, Cao Xidian Univ Natl Lab Radar Signal Proc Xian 710071 Shaanxi Peoples R China Xidian Univ Sch Elect Engn Xian 710071 Shaanxi Peoples R China

High-resolution and wide-swath (HRWS) imaging is highly desired in future synthetic aperture radar (SAR) systems. However, it is a contradictory requirement between high azimuth resolution and wide unambiguous swath coverage in a traditional SAR system. This paper proposes a novel solution to realize HRWS imaging by resolving the range ambiguity through a phase coding technique. The phase coding is employed in both spatial channels and slow time pulses. By properly designing the coding scheme, it is possible to separate the echoes from multiple ambiguous range regions from each other in the spatial domain. For each particular range region, the corresponding optimized receive beampattern can be used to extract the desired echoes from the presumed range region and suppress the undesired echoes from other range-ambiguous regions. The residual range-ambiguous echoes are also addressed. Specifically, it is capable of further mitigating the residual range-ambiguous echoes by optimally designing the coding scheme and the transmit beampattern. In the final, a bank of imaging processors can be implemented to obtain the high-resolution images of these range regions, which can be synthesized into a whole HRWS SAR image of the scene of interest. Simulation results have demonstrated the effectiveness of the proposed method. (C) 2019 Elsevier B.V. All rights reserved.

关键词： Synthetic aperture radar High-resolution and wide-swath space-pulse phase coding Range ambiguity Multiple-input multiple-output

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Study on coding scheme for space-pulse-phase-coding-based high-resolution and wide-swath SAR imaging

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INTERNATIONAL JOURNAL OF REMOTE SENSING 2020年第18期41卷 7186-7200页

作者： Wang, Hanbing Zhang, Yuhong Xu, Jingwei Liao, Guisheng Zeng, Cao Xidian Univ Natl Lab Radar Signal Proc Xian Peoples R China Xidian Univ Sch Elect Engn Xian Peoples R China

There is a conflict between increasing the image swath and improving the azimuth resolution in a conventional single-channel synthetic aperture radar (SAR) system. This paper introduces a method of realizing high-resolution and wide-swath (HRWS) SAR imaging with a multiple-input multiple-output (MIMO) system based on a space-pulse phase coding (SPPC) technique, which makes it possible to discriminate and separate the echoes from multiple ambiguous range regions through coding the phases of the transmitted pulses in each spatial channel. Two coding schemes, referred to as the uniform-cyclic coding and the uniform-acyclic coding, respectively, are devised for discriminating the range-ambiguous echoes. By choosing a proper phase gradient factor, both coding schemes can be used to resolve the range ambiguities. The uniform-cyclic coding scheme presents a little better performance of the range ambiguity suppression, and the uniform-acyclic coding scheme can preserve the coherency of the range-ambiguous clutters. Simulation results have demonstrated the effectiveness of the proposed coding schemes.

关键词： Synthetic aperture radar space-pulse phase coding range ambiguity high-resolution and wide-swath multiple-input multiple-output technique

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