一种SAR两维自聚焦算法的FPGA实现
为实时完成合成孔径雷达（SAR）散焦图像的自聚焦，该文提出了一种能够校正残留距离徙动并且适用于空变误差场景的2维自聚焦处理方案。该方案首先利用2维自聚焦算法同时校正残留距离徙动和粗略补偿相位误差，然后进行分块PGA校正空变误差。文中详细阐述了该方案的FPGA设计过程，并对资源占用、运算速度、精度和聚焦效果进行了分析。当FPGAI作在200MHz时，系统可在5．7S内完成了8K×8K点单精度复图像的自聚焦处理。实测数据处理结果充分验证了该系统的实时性和有效性。...
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| Published in | 雷达学报 Vol. 5; no. 4; pp. 444 - 452 |
|---|---|
| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
南京航空航天大学电子信息工程学院南京 210016%南京航空航天大学电子信息工程学院南京 210016
2016
南京航空航天大学雷达成像与微波光子技术教育部重点实验室南京 210016 |
| Subjects | |
| Online Access | Get full text |
| ISSN | 2095-283X |
| DOI | 10.12000/JR15092 |
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| Abstract | 为实时完成合成孔径雷达（SAR）散焦图像的自聚焦，该文提出了一种能够校正残留距离徙动并且适用于空变误差场景的2维自聚焦处理方案。该方案首先利用2维自聚焦算法同时校正残留距离徙动和粗略补偿相位误差，然后进行分块PGA校正空变误差。文中详细阐述了该方案的FPGA设计过程，并对资源占用、运算速度、精度和聚焦效果进行了分析。当FPGAI作在200MHz时，系统可在5．7S内完成了8K×8K点单精度复图像的自聚焦处理。实测数据处理结果充分验证了该系统的实时性和有效性。 |
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| AbstractList | TN958; 为实时完成合成孔径雷达(SAR)散焦图像的自聚焦，该文提出了一种能够校正残留距离徙动并且适用于空变误差场景的2维自聚焦处理方案。该方案首先利用2维自聚焦算法同时校正残留距离徙动和粗略补偿相位误差，然后进行分块PGA校正空变误差。文中详细阐述了该方案的FPGA设计过程，并对资源占用、运算速度、精度和聚焦效果进行了分析。当FPGA工作在200 MHz时，系统可在5.7 s内完成了8K×8K点单精度复图像的自聚焦处理。实测数据处理结果充分验证了该系统的实时性和有效性。 为实时完成合成孔径雷达（SAR）散焦图像的自聚焦，该文提出了一种能够校正残留距离徙动并且适用于空变误差场景的2维自聚焦处理方案。该方案首先利用2维自聚焦算法同时校正残留距离徙动和粗略补偿相位误差，然后进行分块PGA校正空变误差。文中详细阐述了该方案的FPGA设计过程，并对资源占用、运算速度、精度和聚焦效果进行了分析。当FPGAI作在200MHz时，系统可在5．7S内完成了8K×8K点单精度复图像的自聚焦处理。实测数据处理结果充分验证了该系统的实时性和有效性。 |
| Abstract_FL | For real-time autofocus of defocused images produced by Synthetic Aperture Radar (SAR), the two-dimensional autofocus approach proposed in this study is used to correct the residual range cell migration and compensate for the phase error. Next, a block-wise Phase Gradient Autofocus (PGA) is used to correct the space-variant phase error. The Field-Programmable Gate Array (FPGA) design procedures, resource utilization, processing speed, accuracy, and autofocus are discussed in detail. The system is able to autofocus an 8K × 8K complex image with single precision within 5.7 s when the FPGA works at 200 MHz. The processing of the measured data verifies the effectiveness and real-time capability of the proposed method. |
| Author | 郭江哲 朱岱寅 毛新华 |
| AuthorAffiliation | 南京航空航天大学电子信息工程学院,南京210016 南京航空航天大学雷达成像与微波光子技术教育部重点实验室,南京210016 |
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| Author_FL | Mao Xinhua Guo Jiangzhe Zhu Daiyin |
| Author_FL_xml | – sequence: 1 fullname: Guo Jiangzhe – sequence: 2 fullname: Zhu Daiyin – sequence: 3 fullname: Mao Xinhua |
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| Copyright | Copyright © Wanfang Data Co. Ltd. All Rights Reserved. |
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| DOI | 10.12000/JR15092 |
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| DocumentTitleAlternate | FPGA Implementation of a SAR Two-dimensional Autofocus Approach |
| DocumentTitle_FL | FPGA Implementation of a SAR Two-dimensional Autofocus Approach |
| EndPage | 452 |
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| Keywords | 空变补偿 实时 FPGA 2-D autofocus Real-time Space-variant compensation 2维自聚焦 Field-Programmable Gate Array (FPGA) 相位误差 Phase error |
| Language | Chinese |
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| Notes | 10-1030/TN Guo Jiangzhe1 Zhu Daiyin1,2 Mao Xinhua1,2（1 College of Electronic Information Engineering, Nanjing University of Aeronautics Astronautics＆ Nanjing 210016, China; 2 Radar Imaging ＆ Microwave Photonics Technology Key Laboratory of Ministry of Education, Nanjing University of Aeronautics ＆ Astronautics, Nanjing 210016, China） Phase error; 2-D autofocus; Space-variant compensation; Field-Programmable Gate Array （FPGA）;Real-time For real-time autofocus of defocused images produced by Synthetic Aperture Radar （SAR）, the two-dimensional autofocus approach proposed in this study is used to correct the residual range cell migration and compensate for the phase error. Next, a block-wise Phase Gradient Autofocus （PGA） is used to correct the space-variant phase error. The Field-Programmable Gate Array （FPGA） design procedures, resource utilization： processing speed, accuracy, and autofocus are discussed in detail. The system is able to autofocus an 8K × 8K complex image with single precision within 5.7 s when the |
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| PublicationTitle | 雷达学报 |
| PublicationTitleAlternate | Journal of Radars |
| PublicationYear | 2016 |
| Publisher | 南京航空航天大学电子信息工程学院南京 210016%南京航空航天大学电子信息工程学院南京 210016 南京航空航天大学雷达成像与微波光子技术教育部重点实验室南京 210016 |
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| Snippet | 为实时完成合成孔径雷达（SAR）散焦图像的自聚焦，该文提出了一种能够校正残留距离徙动并且适用于空变误差场景的2维自聚焦处理方案。该方案首先利用2维自聚焦算法同时校正... TN958; 为实时完成合成孔径雷达(SAR)散焦图像的自聚焦，该文提出了一种能够校正残留距离徙动并且适用于空变误差场景的2维自聚焦处理方案。该方案首先利用2维自聚焦算法同时... |
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| StartPage | 444 |
| SubjectTerms | 2维白聚焦 FPGA 实时 相位误差 空变补偿 |
| Title | 一种SAR两维自聚焦算法的FPGA实现 |
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