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Cite this paper: |
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Le GAO, Hanwei SUN, Jifeng QI, Qiufu JIANG. Effect of random phase error and baseline roll angle error on eddy identification by interferometric imaging altimeter[J]. Journal of Oceanology and Limnology, 2022, 40(5): 1881-1888 |
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Effect of random phase error and baseline roll angle error on eddy identification by interferometric imaging altimeter |
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| Le GAO1,3, Hanwei SUN2, Jifeng QI1, Qiufu JIANG1 |
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1 CAS Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences and Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China;
2 Beijing Radio Measurement Institute, Beijing 100854, China;
3 Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China |
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| Abstract: |
| To achieve better observation for sea surface, a new generation of wide-swath interferometric altimeter satellites is proposed. Before satellite launch, it is particularly important to study the data processing methods and carry out the detailed error analysis of ocean satellites, because it is directly related to the ultimate ability of satellites to capture ocean information. For this purpose, ocean eddies are considered a specific case of ocean signals, and it can cause significant changes in sea surface elevation. It is suitable for theoretical simulation of the sea surface and systematic simulation of the altimeter. We analyzed the impacts of random error and baseline error on the sea surface and ocean signals and proposed a combined strategy of low-pass filtering, empirical orthogonal function (EOF) decomposition, and linear fitting to remove the errors. Through this strategy, sea surface anomalies caused by errors were considerably improved, and the capability of satellite for capturing ocean information was enhanced. Notably, we found that the baseline error in sea surface height data was likely to cause inaccuracy in eddy boundary detection, as well as false eddy detection. These abnormalities could be prevented for “clean” sea surface height after the errors removal. |
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| Key words:
interferometric altimetry
baseline error
random error
ocean eddy
theoretical and systematic simulation
error removal strategy
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| Received: 2020-01-22 Revised: 2020-03-22 |
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