Autofocus method for SAR image with multi-blocks
In order to solve synthetic aperture radar image-focus problem when space-variant motion errors could not be ignored, this study proposes a partitioned phase gradient autofocus (PGA) method. In this method, it is most important whether the dominant scatters is in the partitioned images or not. In or...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2019-07-01
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| Series: | The Journal of Engineering |
| Subjects: | |
| Online Access: | https://digital-library.theiet.org/content/journals/10.1049/joe.2019.0463 |
| _version_ | 1819046170039681024 |
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| author | Wei Dong Hanwei Sun Ruixue Zhou Hongmeng Chen |
| author_facet | Wei Dong Hanwei Sun Ruixue Zhou Hongmeng Chen |
| author_sort | Wei Dong |
| collection | DOAJ |
| description | In order to solve synthetic aperture radar image-focus problem when space-variant motion errors could not be ignored, this study proposes a partitioned phase gradient autofocus (PGA) method. In this method, it is most important whether the dominant scatters is in the partitioned images or not. In order to find the dominant scatters, energy gradient factor is defined and energy inflection point is determined. Then, the judgment is made by energy gradient factor and its threshold. Based on measured data processing, it is indicated that the method could distinguish the partitioned images with significant dominant scatters, un-significant dominant scatters, and without dominant scatters. PGA is implemented on all blocks with significant dominant scatters and partial blocks with un-significant dominant scatters. There is no need to use PGA for the blocks without dominant scatters. |
| first_indexed | 2024-12-21T10:40:12Z |
| format | Article |
| id | doaj.art-0a9527821445419e8079f785586fecac |
| institution | Directory Open Access Journal |
| issn | 2051-3305 |
| language | English |
| last_indexed | 2024-12-21T10:40:12Z |
| publishDate | 2019-07-01 |
| publisher | Wiley |
| record_format | Article |
| series | The Journal of Engineering |
| spelling | doaj.art-0a9527821445419e8079f785586fecac2022-12-21T19:06:56ZengWileyThe Journal of Engineering2051-33052019-07-0110.1049/joe.2019.0463JOE.2019.0463Autofocus method for SAR image with multi-blocksWei Dong0Hanwei Sun1Ruixue Zhou2Hongmeng Chen3Beijing Institute of Radio MeasurementBeijing Institute of Radio MeasurementThe Graduate School of Second Academy of China AerospaceBeijing Institute of Radio MeasurementIn order to solve synthetic aperture radar image-focus problem when space-variant motion errors could not be ignored, this study proposes a partitioned phase gradient autofocus (PGA) method. In this method, it is most important whether the dominant scatters is in the partitioned images or not. In order to find the dominant scatters, energy gradient factor is defined and energy inflection point is determined. Then, the judgment is made by energy gradient factor and its threshold. Based on measured data processing, it is indicated that the method could distinguish the partitioned images with significant dominant scatters, un-significant dominant scatters, and without dominant scatters. PGA is implemented on all blocks with significant dominant scatters and partial blocks with un-significant dominant scatters. There is no need to use PGA for the blocks without dominant scatters.https://digital-library.theiet.org/content/journals/10.1049/joe.2019.0463radar imagingsynthetic aperture radargradient methodsimage motion analysisSAR imagesynthetic aperture radar image-focus problemspace-variant motion errorspartitioned phase gradient autofocus methodenergy gradient factorenergy inflection pointPGA methoddata processing |
| spellingShingle | Wei Dong Hanwei Sun Ruixue Zhou Hongmeng Chen Autofocus method for SAR image with multi-blocks The Journal of Engineering radar imaging synthetic aperture radar gradient methods image motion analysis SAR image synthetic aperture radar image-focus problem space-variant motion errors partitioned phase gradient autofocus method energy gradient factor energy inflection point PGA method data processing |
| title | Autofocus method for SAR image with multi-blocks |
| title_full | Autofocus method for SAR image with multi-blocks |
| title_fullStr | Autofocus method for SAR image with multi-blocks |
| title_full_unstemmed | Autofocus method for SAR image with multi-blocks |
| title_short | Autofocus method for SAR image with multi-blocks |
| title_sort | autofocus method for sar image with multi blocks |
| topic | radar imaging synthetic aperture radar gradient methods image motion analysis SAR image synthetic aperture radar image-focus problem space-variant motion errors partitioned phase gradient autofocus method energy gradient factor energy inflection point PGA method data processing |
| url | https://digital-library.theiet.org/content/journals/10.1049/joe.2019.0463 |
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