A Hybrid SAR/ISAR Approach for Refocusing Maritime Moving Targets with the GF-3 SAR Satellite
Due to self-motion and sea waves, moving ships are typically defocused in synthetic aperture radar (SAR) images. To focus non-cooperative targets, the inverse SAR (ISAR) technique is commonly used with motion compensation. The hybrid SAR/ISAR approach allows a long coherent processing interval (CPI)...
Main Authors: | , , |
---|---|
Format: | Article |
Language: | English |
Published: |
MDPI AG
2020-04-01
|
Series: | Sensors |
Subjects: | |
Online Access: | https://www.mdpi.com/1424-8220/20/7/2037 |
id |
doaj-9aee6a76c8134d7a928127004ce2ebd8 |
---|---|
record_format |
Article |
spelling |
doaj-9aee6a76c8134d7a928127004ce2ebd82020-11-25T02:21:57ZengMDPI AGSensors1424-82202020-04-01202037203710.3390/s20072037A Hybrid SAR/ISAR Approach for Refocusing Maritime Moving Targets with the GF-3 SAR SatelliteZhishuo Yan0Yi Zhang1Heng Zhang2Department of Space Microwave Remote Sens. Systems, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, ChinaDepartment of Space Microwave Remote Sens. Systems, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, ChinaDepartment of Space Microwave Remote Sens. Systems, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, ChinaDue to self-motion and sea waves, moving ships are typically defocused in synthetic aperture radar (SAR) images. To focus non-cooperative targets, the inverse SAR (ISAR) technique is commonly used with motion compensation. The hybrid SAR/ISAR approach allows a long coherent processing interval (CPI), in which SAR targets are processed with ISAR processing, and exploits the advantages of both SAR and ISAR to generate well-focused images of moving targets. In this paper, based on hybrid SAR/ISAR processing, we propose an improved rank-one phase estimation method (IROPE). By using an iterative two-step convergence approach in the IROPE, the proposed method achieves accurate phase error, maintains robustness to noise and performs well in estimating various phase errors. The performance of the proposed method is analyzed by comparing it with other focusing algorithms in terms of processing simulated data and real complex image data acquired by Gaofen-3 (GF-3) in spotlight mode. The results demonstrate the effectiveness of the proposed method.https://www.mdpi.com/1424-8220/20/7/2037synthetic aperture radar (SAR)moving targetsinverse SAR (ISAR)motion compensationhybrid SAR/ISARimproved rank-one phase estimation (IROPE) |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Zhishuo Yan Yi Zhang Heng Zhang |
spellingShingle |
Zhishuo Yan Yi Zhang Heng Zhang A Hybrid SAR/ISAR Approach for Refocusing Maritime Moving Targets with the GF-3 SAR Satellite Sensors synthetic aperture radar (SAR) moving targets inverse SAR (ISAR) motion compensation hybrid SAR/ISAR improved rank-one phase estimation (IROPE) |
author_facet |
Zhishuo Yan Yi Zhang Heng Zhang |
author_sort |
Zhishuo Yan |
title |
A Hybrid SAR/ISAR Approach for Refocusing Maritime Moving Targets with the GF-3 SAR Satellite |
title_short |
A Hybrid SAR/ISAR Approach for Refocusing Maritime Moving Targets with the GF-3 SAR Satellite |
title_full |
A Hybrid SAR/ISAR Approach for Refocusing Maritime Moving Targets with the GF-3 SAR Satellite |
title_fullStr |
A Hybrid SAR/ISAR Approach for Refocusing Maritime Moving Targets with the GF-3 SAR Satellite |
title_full_unstemmed |
A Hybrid SAR/ISAR Approach for Refocusing Maritime Moving Targets with the GF-3 SAR Satellite |
title_sort |
hybrid sar/isar approach for refocusing maritime moving targets with the gf-3 sar satellite |
publisher |
MDPI AG |
series |
Sensors |
issn |
1424-8220 |
publishDate |
2020-04-01 |
description |
Due to self-motion and sea waves, moving ships are typically defocused in synthetic aperture radar (SAR) images. To focus non-cooperative targets, the inverse SAR (ISAR) technique is commonly used with motion compensation. The hybrid SAR/ISAR approach allows a long coherent processing interval (CPI), in which SAR targets are processed with ISAR processing, and exploits the advantages of both SAR and ISAR to generate well-focused images of moving targets. In this paper, based on hybrid SAR/ISAR processing, we propose an improved rank-one phase estimation method (IROPE). By using an iterative two-step convergence approach in the IROPE, the proposed method achieves accurate phase error, maintains robustness to noise and performs well in estimating various phase errors. The performance of the proposed method is analyzed by comparing it with other focusing algorithms in terms of processing simulated data and real complex image data acquired by Gaofen-3 (GF-3) in spotlight mode. The results demonstrate the effectiveness of the proposed method. |
topic |
synthetic aperture radar (SAR) moving targets inverse SAR (ISAR) motion compensation hybrid SAR/ISAR improved rank-one phase estimation (IROPE) |
url |
https://www.mdpi.com/1424-8220/20/7/2037 |
work_keys_str_mv |
AT zhishuoyan ahybridsarisarapproachforrefocusingmaritimemovingtargetswiththegf3sarsatellite AT yizhang ahybridsarisarapproachforrefocusingmaritimemovingtargetswiththegf3sarsatellite AT hengzhang ahybridsarisarapproachforrefocusingmaritimemovingtargetswiththegf3sarsatellite AT zhishuoyan hybridsarisarapproachforrefocusingmaritimemovingtargetswiththegf3sarsatellite AT yizhang hybridsarisarapproachforrefocusingmaritimemovingtargetswiththegf3sarsatellite AT hengzhang hybridsarisarapproachforrefocusingmaritimemovingtargetswiththegf3sarsatellite |
_version_ |
1724864325303140352 |