An Ultra-Wide Swath Synthetic Aperture Radar Imaging System via Chaotic Frequency Modulation Signals and a Random Pulse Repetition Interval Variation Strategy
Ultra-wide swath synthetic aperture radar (SAR) systems are of great significance for applications such as terrain measurement and ocean monitoring. In conventional SAR systems, targets echo from the near-range and far-range of an observed swath mutually overlap, and the blind ranges are caused by t...
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MDPI AG
2025-05-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/17/10/1719 |
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| author | Wenjiao Chen Jiwen Geng Yufeng Guo Li Zhang |
| author_facet | Wenjiao Chen Jiwen Geng Yufeng Guo Li Zhang |
| author_sort | Wenjiao Chen |
| collection | DOAJ |
| description | Ultra-wide swath synthetic aperture radar (SAR) systems are of great significance for applications such as terrain measurement and ocean monitoring. In conventional SAR systems, targets echo from the near-range and far-range of an observed swath mutually overlap, and the blind ranges are caused by those that the radar cannot receive while it is transmitting. Therefore, the swath of conventional SAR systems is limited due to their range ambiguity as well as the transmitted pulse blockage. With the development of waveform diversity, range ambiguity can be suppressed by radar waveform design with a low-range sidelobe without increasing the system’s complexity when compared to the scan-on-receive (SCORE) based on digital beamforming (DBF) technique. Additionally, by optimizing the pulse repetition interval (PRI) variation strategy, the negative impact of blind range on imaging can be reduced. Based on these technologies, this paper proposes a theoretical architecture to achieve an ultra-wide swath SAR imaging system via chaotic frequency modulation (FM) signals and a random pulse repetition interval variation strategy without increasing the antenna area. By transmitting time-variant chaotic-FM signals, the interference between targets in the near range and far range can be reduced by the corresponding match filters. Furthermore, random pulse repetition intervals increase the irregularity and aperiodicity of the blind ranges to further improve the imaging quality. Simulation results demonstrate that the proposed wide-swath SAR system has better performance compared to classical SAR systems. |
| format | Article |
| id | doaj-art-b0960ffc982a4e0988fe7abd0823bfd3 |
| institution | Kabale University |
| issn | 2072-4292 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj-art-b0960ffc982a4e0988fe7abd0823bfd32025-08-20T03:47:58ZengMDPI AGRemote Sensing2072-42922025-05-011710171910.3390/rs17101719An Ultra-Wide Swath Synthetic Aperture Radar Imaging System via Chaotic Frequency Modulation Signals and a Random Pulse Repetition Interval Variation StrategyWenjiao Chen0Jiwen Geng1Yufeng Guo2Li Zhang3The Department of Space Control and Communication, Space Engineering University, Beijing 102249, ChinaThe School of Information Science and Engineering, Southeast University, Nanjing 214135, ChinaThe Department of Space Control and Communication, Space Engineering University, Beijing 102249, ChinaThe 15th Research Institute of China Electronics Technology Corporation, Beijing 100083, ChinaUltra-wide swath synthetic aperture radar (SAR) systems are of great significance for applications such as terrain measurement and ocean monitoring. In conventional SAR systems, targets echo from the near-range and far-range of an observed swath mutually overlap, and the blind ranges are caused by those that the radar cannot receive while it is transmitting. Therefore, the swath of conventional SAR systems is limited due to their range ambiguity as well as the transmitted pulse blockage. With the development of waveform diversity, range ambiguity can be suppressed by radar waveform design with a low-range sidelobe without increasing the system’s complexity when compared to the scan-on-receive (SCORE) based on digital beamforming (DBF) technique. Additionally, by optimizing the pulse repetition interval (PRI) variation strategy, the negative impact of blind range on imaging can be reduced. Based on these technologies, this paper proposes a theoretical architecture to achieve an ultra-wide swath SAR imaging system via chaotic frequency modulation (FM) signals and a random pulse repetition interval variation strategy without increasing the antenna area. By transmitting time-variant chaotic-FM signals, the interference between targets in the near range and far range can be reduced by the corresponding match filters. Furthermore, random pulse repetition intervals increase the irregularity and aperiodicity of the blind ranges to further improve the imaging quality. Simulation results demonstrate that the proposed wide-swath SAR system has better performance compared to classical SAR systems.https://www.mdpi.com/2072-4292/17/10/1719ultra-wide swathsynthetic aperture radar (SAR)waveform diversitychaotic frequency modulation (FM) signalsoptimized random pulse repetition interval (PRI) variation |
| spellingShingle | Wenjiao Chen Jiwen Geng Yufeng Guo Li Zhang An Ultra-Wide Swath Synthetic Aperture Radar Imaging System via Chaotic Frequency Modulation Signals and a Random Pulse Repetition Interval Variation Strategy Remote Sensing ultra-wide swath synthetic aperture radar (SAR) waveform diversity chaotic frequency modulation (FM) signals optimized random pulse repetition interval (PRI) variation |
| title | An Ultra-Wide Swath Synthetic Aperture Radar Imaging System via Chaotic Frequency Modulation Signals and a Random Pulse Repetition Interval Variation Strategy |
| title_full | An Ultra-Wide Swath Synthetic Aperture Radar Imaging System via Chaotic Frequency Modulation Signals and a Random Pulse Repetition Interval Variation Strategy |
| title_fullStr | An Ultra-Wide Swath Synthetic Aperture Radar Imaging System via Chaotic Frequency Modulation Signals and a Random Pulse Repetition Interval Variation Strategy |
| title_full_unstemmed | An Ultra-Wide Swath Synthetic Aperture Radar Imaging System via Chaotic Frequency Modulation Signals and a Random Pulse Repetition Interval Variation Strategy |
| title_short | An Ultra-Wide Swath Synthetic Aperture Radar Imaging System via Chaotic Frequency Modulation Signals and a Random Pulse Repetition Interval Variation Strategy |
| title_sort | ultra wide swath synthetic aperture radar imaging system via chaotic frequency modulation signals and a random pulse repetition interval variation strategy |
| topic | ultra-wide swath synthetic aperture radar (SAR) waveform diversity chaotic frequency modulation (FM) signals optimized random pulse repetition interval (PRI) variation |
| url | https://www.mdpi.com/2072-4292/17/10/1719 |
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