Sea surface height measuring using InSAR altimeter
Satellite altimetry has been widely used in measuring ocean topography from space. The conventional altimeter system is the nadir radar altimeter system which has the limitations of one-dimensional measurement and is unable to get both high temporal and spatial resolution. The InSAR altimetry system...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
KeAi Communications Co., Ltd.
2017-07-01
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| Series: | Geodesy and Geodynamics |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S167498471630163X |
| _version_ | 1818913852129017856 |
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| author | Xiaohong Sui Running Zhang Falin Wu Yang Li Xiaoyun Wan |
| author_facet | Xiaohong Sui Running Zhang Falin Wu Yang Li Xiaoyun Wan |
| author_sort | Xiaohong Sui |
| collection | DOAJ |
| description | Satellite altimetry has been widely used in measuring ocean topography from space. The conventional altimeter system is the nadir radar altimeter system which has the limitations of one-dimensional measurement and is unable to get both high temporal and spatial resolution. The InSAR altimetry system using InSAR altimeter instead of nadir radar altimeter is an improvement which can get both high cross-track and along-track resolution and wide swath. However, the conventional SAR interferometry only can achieve meter level height accuracy. This paper focuses on a method of radar echo-tracking for InSAR altimeter system in order to correct the slant range measurements and finally to improve the height measurement accuracy to several centimeters' level. Radar slant range (from observed pixels to radar antenna) estimation error affects the height measurement accuracy badly, nevertheless not considered in the conventional SAR interferometry. The proposed method is ameliorated based on the traditional echo-model used in nadir radar altimeter system, focusing on the echo signals from observed pixels with different incident angles. Simulations of sea surface height measurements are performed in the last part of this paper, and the conclusions are drawn that, with corrected slant range, the accuracy of InSAR altimetry can be much better than the conventional SAR interferometry. |
| first_indexed | 2024-12-19T23:37:04Z |
| format | Article |
| id | doaj.art-85ae80f2742a462582b80e928bee1ef2 |
| institution | Directory Open Access Journal |
| issn | 1674-9847 |
| language | English |
| last_indexed | 2024-12-19T23:37:04Z |
| publishDate | 2017-07-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Geodesy and Geodynamics |
| spelling | doaj.art-85ae80f2742a462582b80e928bee1ef22022-12-21T20:01:34ZengKeAi Communications Co., Ltd.Geodesy and Geodynamics1674-98472017-07-018427828410.1016/j.geog.2017.03.005Sea surface height measuring using InSAR altimeterXiaohong Sui0Running Zhang1Falin Wu2Yang Li3Xiaoyun Wan4DFH Satellite Co., Ltd, Beijing, 100094, ChinaBeijing Institute of Spacecraft System Engineering, Beijing, 100094, ChinaBeihang University, Beijing, 100083, ChinaDFH Satellite Co., Ltd, Beijing, 100094, ChinaQian Xuesen Laboratory of Space Technology, Beijing, 100094, ChinaSatellite altimetry has been widely used in measuring ocean topography from space. The conventional altimeter system is the nadir radar altimeter system which has the limitations of one-dimensional measurement and is unable to get both high temporal and spatial resolution. The InSAR altimetry system using InSAR altimeter instead of nadir radar altimeter is an improvement which can get both high cross-track and along-track resolution and wide swath. However, the conventional SAR interferometry only can achieve meter level height accuracy. This paper focuses on a method of radar echo-tracking for InSAR altimeter system in order to correct the slant range measurements and finally to improve the height measurement accuracy to several centimeters' level. Radar slant range (from observed pixels to radar antenna) estimation error affects the height measurement accuracy badly, nevertheless not considered in the conventional SAR interferometry. The proposed method is ameliorated based on the traditional echo-model used in nadir radar altimeter system, focusing on the echo signals from observed pixels with different incident angles. Simulations of sea surface height measurements are performed in the last part of this paper, and the conclusions are drawn that, with corrected slant range, the accuracy of InSAR altimetry can be much better than the conventional SAR interferometry.http://www.sciencedirect.com/science/article/pii/S167498471630163XInSAR altimeterNadir radar altimeterSea surface heightEcho-tracking |
| spellingShingle | Xiaohong Sui Running Zhang Falin Wu Yang Li Xiaoyun Wan Sea surface height measuring using InSAR altimeter Geodesy and Geodynamics InSAR altimeter Nadir radar altimeter Sea surface height Echo-tracking |
| title | Sea surface height measuring using InSAR altimeter |
| title_full | Sea surface height measuring using InSAR altimeter |
| title_fullStr | Sea surface height measuring using InSAR altimeter |
| title_full_unstemmed | Sea surface height measuring using InSAR altimeter |
| title_short | Sea surface height measuring using InSAR altimeter |
| title_sort | sea surface height measuring using insar altimeter |
| topic | InSAR altimeter Nadir radar altimeter Sea surface height Echo-tracking |
| url | http://www.sciencedirect.com/science/article/pii/S167498471630163X |
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