An Imaging Method for Marine Targets in Corner Reflector Jamming Scenario Based on Time–Frequency Analysis and Modified Clean Technique
In the corner reflector jamming scenario, the ship target and the corner reflector array have different degrees of defocusing in the synthetic aperture radar (SAR) image due to their complex motions, which is unfavorable to the subsequent target recognition. In this manuscript, we propose an imaging...
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MDPI AG
2025-01-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/17/2/310 |
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| author | Changhong Chen Wenkang Liu Yuexin Gao Lei Cui Quan Chen Jixiang Fu Mengdao Xing |
| author_facet | Changhong Chen Wenkang Liu Yuexin Gao Lei Cui Quan Chen Jixiang Fu Mengdao Xing |
| author_sort | Changhong Chen |
| collection | DOAJ |
| description | In the corner reflector jamming scenario, the ship target and the corner reflector array have different degrees of defocusing in the synthetic aperture radar (SAR) image due to their complex motions, which is unfavorable to the subsequent target recognition. In this manuscript, we propose an imaging method for marine targets based on time–frequency analysis with the modified Clean technique. Firstly, the motion models of the ship target and the corner reflector array are established, and the characteristics of their Doppler parameter distribution are analyzed. Then, the Chirp Rate–Quadratic Chirp Rate Distribution (CR-QCRD) algorithm is utilized to estimate the Doppler parameters. To address the challenges posed by the aggregated scattering points of the ship target and the overlapping Doppler histories of the corner reflector array, the Clean technique is modified by short-time Fourier transform (STFT) filtering and amplitude–phase distortion correction using fractional Fourier transform (FrFT) filtering. This modification aims to improve the accuracy and efficiency of extracting scattering point components. Thirdly, in response to the poor universality of the traditional Clean iterative termination condition, the kurtosis of the residual signal spectrum amplitude is adopted as the new iterative termination condition. Compared with the existing imaging methods, the proposed method can adapt to the different Doppler distribution characteristics of the ship target and the corner reflector array, thus realizing better robustness in obtaining a well-focused target image. Finally, simulation experiments verify the effectiveness of the algorithm. |
| format | Article |
| id | doaj-art-b51ed3b9a9344de68f9c40946f16eb33 |
| institution | Kabale University |
| issn | 2072-4292 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj-art-b51ed3b9a9344de68f9c40946f16eb332025-01-24T13:48:05ZengMDPI AGRemote Sensing2072-42922025-01-0117231010.3390/rs17020310An Imaging Method for Marine Targets in Corner Reflector Jamming Scenario Based on Time–Frequency Analysis and Modified Clean TechniqueChanghong Chen0Wenkang Liu1Yuexin Gao2Lei Cui3Quan Chen4Jixiang Fu5Mengdao Xing6The National Key Laboratory of Radar Signal Processing, Xidian University, Xi’an 710071, ChinaThe Academy of Advanced Interdisciplinary Research, Xidian University, Xi’an 710071, ChinaThe School of Aerospace Science and Technology, Xidian University, Xi’an 710071, ChinaShanghai Institute of Satellite Engineering, Shanghai 201109, ChinaShanghai Institute of Satellite Engineering, Shanghai 201109, ChinaThe Academy of Advanced Interdisciplinary Research, Xidian University, Xi’an 710071, ChinaThe National Key Laboratory of Radar Signal Processing, Xidian University, Xi’an 710071, ChinaIn the corner reflector jamming scenario, the ship target and the corner reflector array have different degrees of defocusing in the synthetic aperture radar (SAR) image due to their complex motions, which is unfavorable to the subsequent target recognition. In this manuscript, we propose an imaging method for marine targets based on time–frequency analysis with the modified Clean technique. Firstly, the motion models of the ship target and the corner reflector array are established, and the characteristics of their Doppler parameter distribution are analyzed. Then, the Chirp Rate–Quadratic Chirp Rate Distribution (CR-QCRD) algorithm is utilized to estimate the Doppler parameters. To address the challenges posed by the aggregated scattering points of the ship target and the overlapping Doppler histories of the corner reflector array, the Clean technique is modified by short-time Fourier transform (STFT) filtering and amplitude–phase distortion correction using fractional Fourier transform (FrFT) filtering. This modification aims to improve the accuracy and efficiency of extracting scattering point components. Thirdly, in response to the poor universality of the traditional Clean iterative termination condition, the kurtosis of the residual signal spectrum amplitude is adopted as the new iterative termination condition. Compared with the existing imaging methods, the proposed method can adapt to the different Doppler distribution characteristics of the ship target and the corner reflector array, thus realizing better robustness in obtaining a well-focused target image. Finally, simulation experiments verify the effectiveness of the algorithm.https://www.mdpi.com/2072-4292/17/2/310marine targetcorner reflectorshipISAR imagingDoppler parameter estimationClean technique |
| spellingShingle | Changhong Chen Wenkang Liu Yuexin Gao Lei Cui Quan Chen Jixiang Fu Mengdao Xing An Imaging Method for Marine Targets in Corner Reflector Jamming Scenario Based on Time–Frequency Analysis and Modified Clean Technique Remote Sensing marine target corner reflector ship ISAR imaging Doppler parameter estimation Clean technique |
| title | An Imaging Method for Marine Targets in Corner Reflector Jamming Scenario Based on Time–Frequency Analysis and Modified Clean Technique |
| title_full | An Imaging Method for Marine Targets in Corner Reflector Jamming Scenario Based on Time–Frequency Analysis and Modified Clean Technique |
| title_fullStr | An Imaging Method for Marine Targets in Corner Reflector Jamming Scenario Based on Time–Frequency Analysis and Modified Clean Technique |
| title_full_unstemmed | An Imaging Method for Marine Targets in Corner Reflector Jamming Scenario Based on Time–Frequency Analysis and Modified Clean Technique |
| title_short | An Imaging Method for Marine Targets in Corner Reflector Jamming Scenario Based on Time–Frequency Analysis and Modified Clean Technique |
| title_sort | imaging method for marine targets in corner reflector jamming scenario based on time frequency analysis and modified clean technique |
| topic | marine target corner reflector ship ISAR imaging Doppler parameter estimation Clean technique |
| url | https://www.mdpi.com/2072-4292/17/2/310 |
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