A Synthetic Bandwidth Method for High-Resolution SAR Based on PGA in the Range Dimension
The synthetic bandwidth technique is an effective method to achieve ultra-high range resolution in an SAR system. There are mainly two challenges in its implementation. The first one is the estimation and compensation of system errors, such as the timing deviation and the amplitude-phase error. Due...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2015-06-01
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| Series: | Sensors |
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| Online Access: | http://www.mdpi.com/1424-8220/15/7/15339 |
| _version_ | 1811263326766759936 |
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| author | Jincheng Li Jie Chen Wei Liu Pengbo Wang Chunsheng Li |
| author_facet | Jincheng Li Jie Chen Wei Liu Pengbo Wang Chunsheng Li |
| author_sort | Jincheng Li |
| collection | DOAJ |
| description | The synthetic bandwidth technique is an effective method to achieve ultra-high range resolution in an SAR system. There are mainly two challenges in its implementation. The first one is the estimation and compensation of system errors, such as the timing deviation and the amplitude-phase error. Due to precision limitation of the radar instrument, construction of the sub-band signals becomes much more complicated with these errors. The second challenge lies in the combination method, that is how to fit the sub-band signals together into a much wider bandwidth. In this paper, a novel synthetic bandwidth approach is presented. It considers two main errors of the multi-sub-band SAR system and compensates them by a two-order PGA (phase gradient auto-focus)-based method, named TRPGA. Furthermore, an improved cut-paste method is proposed to combine the signals in the frequency domain. It exploits the redundancy of errors and requires only a limited amount of data in the azimuth direction for error estimation. Moreover, the up-sampling operation can be avoided in the combination process. Imaging results based on both simulated and real data are presented to validate the proposed approach. |
| first_indexed | 2024-04-12T19:43:44Z |
| format | Article |
| id | doaj.art-f5126762f400401085e56c3588969207 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-12T19:43:44Z |
| publishDate | 2015-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-f5126762f400401085e56c35889692072022-12-22T03:19:01ZengMDPI AGSensors1424-82202015-06-01157153391536210.3390/s150715339s150715339A Synthetic Bandwidth Method for High-Resolution SAR Based on PGA in the Range DimensionJincheng Li0Jie Chen1Wei Liu2Pengbo Wang3Chunsheng Li4School of Electronic and Information Engineering, Beihang University, Beijing 100191, ChinaSchool of Electronic and Information Engineering, Beihang University, Beijing 100191, ChinaElectronic and Electronic Engineering Department, University of Sheffield, Sheffield S1-3JD, UKSchool of Electronic and Information Engineering, Beihang University, Beijing 100191, ChinaSchool of Electronic and Information Engineering, Beihang University, Beijing 100191, ChinaThe synthetic bandwidth technique is an effective method to achieve ultra-high range resolution in an SAR system. There are mainly two challenges in its implementation. The first one is the estimation and compensation of system errors, such as the timing deviation and the amplitude-phase error. Due to precision limitation of the radar instrument, construction of the sub-band signals becomes much more complicated with these errors. The second challenge lies in the combination method, that is how to fit the sub-band signals together into a much wider bandwidth. In this paper, a novel synthetic bandwidth approach is presented. It considers two main errors of the multi-sub-band SAR system and compensates them by a two-order PGA (phase gradient auto-focus)-based method, named TRPGA. Furthermore, an improved cut-paste method is proposed to combine the signals in the frequency domain. It exploits the redundancy of errors and requires only a limited amount of data in the azimuth direction for error estimation. Moreover, the up-sampling operation can be avoided in the combination process. Imaging results based on both simulated and real data are presented to validate the proposed approach.http://www.mdpi.com/1424-8220/15/7/15339synthetic bandwidthsynthetic aperture radar (SAR)ultra-high range resolution |
| spellingShingle | Jincheng Li Jie Chen Wei Liu Pengbo Wang Chunsheng Li A Synthetic Bandwidth Method for High-Resolution SAR Based on PGA in the Range Dimension Sensors synthetic bandwidth synthetic aperture radar (SAR) ultra-high range resolution |
| title | A Synthetic Bandwidth Method for High-Resolution SAR Based on PGA in the Range Dimension |
| title_full | A Synthetic Bandwidth Method for High-Resolution SAR Based on PGA in the Range Dimension |
| title_fullStr | A Synthetic Bandwidth Method for High-Resolution SAR Based on PGA in the Range Dimension |
| title_full_unstemmed | A Synthetic Bandwidth Method for High-Resolution SAR Based on PGA in the Range Dimension |
| title_short | A Synthetic Bandwidth Method for High-Resolution SAR Based on PGA in the Range Dimension |
| title_sort | synthetic bandwidth method for high resolution sar based on pga in the range dimension |
| topic | synthetic bandwidth synthetic aperture radar (SAR) ultra-high range resolution |
| url | http://www.mdpi.com/1424-8220/15/7/15339 |
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