Numerical simulation for large baseline interferometric imaging altimeter
Sea topography information holds significant importance in oceanic research and the climate change detection. Radar imaging altimetry has emerged as the leading approach for global ocean observation, employing synthetic aperture radar (SAR) interferometry to enhance the spatial resolution of Sea top...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2025-01-01
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| Series: | Geodesy and Geodynamics |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674984724000983 |
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| _version_ | 1841544056957566976 |
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| author | Jie Liu Bo Liu Xiaonan An Haifeng Kou Bing Li |
| author_facet | Jie Liu Bo Liu Xiaonan An Haifeng Kou Bing Li |
| author_sort | Jie Liu |
| collection | DOAJ |
| description | Sea topography information holds significant importance in oceanic research and the climate change detection. Radar imaging altimetry has emerged as the leading approach for global ocean observation, employing synthetic aperture radar (SAR) interferometry to enhance the spatial resolution of Sea topography. Nevertheless, current payload capacity and satellite hardware limitations prevent the extension of the interferometric baseline by enlarging the physical antenna size. This constraint hinders achieving centimeter-level accuracy in interferometric altimetry. To address this challenge, we conducted a numerical simulation to assess the viability of a large baseline interferometric imaging altimeter (LB-IIA). By controlling the baseline within the range of 600–1000 m through spiral orbit design in two satellites and mitigating baseline de-correlation with the carrier frequency shift (CFS) technique, we aimed to overcome the above limitations. Our findings demonstrate the efficacy of the CFS technique in compensating for baseline decoherence, elevating coherence from less than 0.1 to over 0.85. Concurrently. The height difference accuracy between neighboring sea surfaces reaches 1 cm within a 1 km resolution. This study is anticipated to serve as a foundational reference for future interferometric imaging altimeter development, catering to the demand for high-precision sea topography data in accurate global bathymetry inversion. |
| format | Article |
| id | doaj-art-cd3da488db7246d388cdd853744dd9f2 |
| institution | Kabale University |
| issn | 1674-9847 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Geodesy and Geodynamics |
| spelling | doaj-art-cd3da488db7246d388cdd853744dd9f22025-01-13T04:18:36ZengKeAi Communications Co., Ltd.Geodesy and Geodynamics1674-98472025-01-01161111126Numerical simulation for large baseline interferometric imaging altimeterJie Liu0Bo Liu1Xiaonan An2Haifeng Kou3Bing Li4China Academy of Aerospace Science and Innovation, Beijing 100000, ChinaCorresponding author.; China Academy of Aerospace Science and Innovation, Beijing 100000, ChinaChina Academy of Aerospace Science and Innovation, Beijing 100000, ChinaChina Academy of Aerospace Science and Innovation, Beijing 100000, ChinaChina Academy of Aerospace Science and Innovation, Beijing 100000, ChinaSea topography information holds significant importance in oceanic research and the climate change detection. Radar imaging altimetry has emerged as the leading approach for global ocean observation, employing synthetic aperture radar (SAR) interferometry to enhance the spatial resolution of Sea topography. Nevertheless, current payload capacity and satellite hardware limitations prevent the extension of the interferometric baseline by enlarging the physical antenna size. This constraint hinders achieving centimeter-level accuracy in interferometric altimetry. To address this challenge, we conducted a numerical simulation to assess the viability of a large baseline interferometric imaging altimeter (LB-IIA). By controlling the baseline within the range of 600–1000 m through spiral orbit design in two satellites and mitigating baseline de-correlation with the carrier frequency shift (CFS) technique, we aimed to overcome the above limitations. Our findings demonstrate the efficacy of the CFS technique in compensating for baseline decoherence, elevating coherence from less than 0.1 to over 0.85. Concurrently. The height difference accuracy between neighboring sea surfaces reaches 1 cm within a 1 km resolution. This study is anticipated to serve as a foundational reference for future interferometric imaging altimeter development, catering to the demand for high-precision sea topography data in accurate global bathymetry inversion.http://www.sciencedirect.com/science/article/pii/S1674984724000983Sea topographyNumerical simulationCarrier frequency shift (CFS)Large baseline interferometric imaging altimeter (LB-IIA) |
| spellingShingle | Jie Liu Bo Liu Xiaonan An Haifeng Kou Bing Li Numerical simulation for large baseline interferometric imaging altimeter Geodesy and Geodynamics Sea topography Numerical simulation Carrier frequency shift (CFS) Large baseline interferometric imaging altimeter (LB-IIA) |
| title | Numerical simulation for large baseline interferometric imaging altimeter |
| title_full | Numerical simulation for large baseline interferometric imaging altimeter |
| title_fullStr | Numerical simulation for large baseline interferometric imaging altimeter |
| title_full_unstemmed | Numerical simulation for large baseline interferometric imaging altimeter |
| title_short | Numerical simulation for large baseline interferometric imaging altimeter |
| title_sort | numerical simulation for large baseline interferometric imaging altimeter |
| topic | Sea topography Numerical simulation Carrier frequency shift (CFS) Large baseline interferometric imaging altimeter (LB-IIA) |
| url | http://www.sciencedirect.com/science/article/pii/S1674984724000983 |
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