A Novel Imaging Scheme of Squint Multichannel SAR: First Result of GF-3 Satellite
The azimuth multichannel synthetic aperture radar (MC-SAR) is an effective means of earth observation due to its high-resolution and wide-swath (HRWS) imaging capability. Compared with the traditional MC-SAR, the two-dimensional (2D) spectrum of the squint multichannel synthetic aperture radar (SMC-...
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| Format: | Article |
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MDPI AG
2022-08-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/14/16/3962 |
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| author | Yini Lv Mingyang Shang Lihua Zhong Xiaolan Qiu Chibiao Ding |
| author_facet | Yini Lv Mingyang Shang Lihua Zhong Xiaolan Qiu Chibiao Ding |
| author_sort | Yini Lv |
| collection | DOAJ |
| description | The azimuth multichannel synthetic aperture radar (MC-SAR) is an effective means of earth observation due to its high-resolution and wide-swath (HRWS) imaging capability. Compared with the traditional MC-SAR, the two-dimensional (2D) spectrum of the squint multichannel synthetic aperture radar (SMC-SAR) is skewed, leading to the severe coupling between azimuth signals and range signals. Therefore, the traditional imaging algorithms are inapplicable to SMC-SAR. Currently, the existing imaging algorithms for SMC-SAR need interpolation or sub-aperture processing, which results in low efficiency. This paper proposes a novel imaging scheme for spaceborne SMC-SAR to handle this issue. With the squint angle known, the Doppler centroid can be compensated for by the spectrum shift function. Additionally, the frequency correlation method (FCM) is utilized to estimate the channel phase imbalance. After that, the azimuth multichannel data are reconstructed by the filter banks to eliminate the Doppler spectrum aliasing. Finally, the data are imaged based on the modified equivalent slant range model (MESRM). Both the simulation and Gaofen-3 (GF-3) data experiments demonstrate the effectiveness and efficiency of the proposed method. |
| first_indexed | 2024-03-09T12:39:42Z |
| format | Article |
| id | doaj.art-3ff371b5617c45939bea629d81f3d7d0 |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-03-09T12:39:42Z |
| publishDate | 2022-08-01 |
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| spelling | doaj.art-3ff371b5617c45939bea629d81f3d7d02023-11-30T22:19:31ZengMDPI AGRemote Sensing2072-42922022-08-011416396210.3390/rs14163962A Novel Imaging Scheme of Squint Multichannel SAR: First Result of GF-3 SatelliteYini Lv0Mingyang Shang1Lihua Zhong2Xiaolan Qiu3Chibiao Ding4Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100194, ChinaAerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100194, ChinaAerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100194, ChinaAerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100194, ChinaAerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100194, ChinaThe azimuth multichannel synthetic aperture radar (MC-SAR) is an effective means of earth observation due to its high-resolution and wide-swath (HRWS) imaging capability. Compared with the traditional MC-SAR, the two-dimensional (2D) spectrum of the squint multichannel synthetic aperture radar (SMC-SAR) is skewed, leading to the severe coupling between azimuth signals and range signals. Therefore, the traditional imaging algorithms are inapplicable to SMC-SAR. Currently, the existing imaging algorithms for SMC-SAR need interpolation or sub-aperture processing, which results in low efficiency. This paper proposes a novel imaging scheme for spaceborne SMC-SAR to handle this issue. With the squint angle known, the Doppler centroid can be compensated for by the spectrum shift function. Additionally, the frequency correlation method (FCM) is utilized to estimate the channel phase imbalance. After that, the azimuth multichannel data are reconstructed by the filter banks to eliminate the Doppler spectrum aliasing. Finally, the data are imaged based on the modified equivalent slant range model (MESRM). Both the simulation and Gaofen-3 (GF-3) data experiments demonstrate the effectiveness and efficiency of the proposed method.https://www.mdpi.com/2072-4292/14/16/3962synthetic aperture radar (SAR)high-resolution and wide-swath (HRWS) imagingsquint multichannel SAR (SMC-SAR)Gaofen-3 (GF-3) |
| spellingShingle | Yini Lv Mingyang Shang Lihua Zhong Xiaolan Qiu Chibiao Ding A Novel Imaging Scheme of Squint Multichannel SAR: First Result of GF-3 Satellite Remote Sensing synthetic aperture radar (SAR) high-resolution and wide-swath (HRWS) imaging squint multichannel SAR (SMC-SAR) Gaofen-3 (GF-3) |
| title | A Novel Imaging Scheme of Squint Multichannel SAR: First Result of GF-3 Satellite |
| title_full | A Novel Imaging Scheme of Squint Multichannel SAR: First Result of GF-3 Satellite |
| title_fullStr | A Novel Imaging Scheme of Squint Multichannel SAR: First Result of GF-3 Satellite |
| title_full_unstemmed | A Novel Imaging Scheme of Squint Multichannel SAR: First Result of GF-3 Satellite |
| title_short | A Novel Imaging Scheme of Squint Multichannel SAR: First Result of GF-3 Satellite |
| title_sort | novel imaging scheme of squint multichannel sar first result of gf 3 satellite |
| topic | synthetic aperture radar (SAR) high-resolution and wide-swath (HRWS) imaging squint multichannel SAR (SMC-SAR) Gaofen-3 (GF-3) |
| url | https://www.mdpi.com/2072-4292/14/16/3962 |
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