Analysis and correction of GIM error about Jason-2 altimeter

Huang Xiafeng; Miao Hongli; Miao Xiangying; Xue Wenwen

doi:10.3969/j.issn.0253-4193.2019.07.013

Volume 41 Issue 7

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Huang Xiafeng，Miao Hongli，Miao Xiangying, et al. Analysis and correction of GIM error about Jason-2 altimeter[J]. Haiyang Xuebao，2019, 41(7)：143–148，doi:10.3969/j.issn.0253−4193.2019.07.013

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Analysis and correction of GIM error about Jason-2 altimeter

doi: 10.3969/j.issn.0253-4193.2019.07.013

College of Information Science and Engineering, Ocean University of China, Qingdao 266100, China

Received Date: 2018-05-30
Rev Recd Date: 2018-11-02

Available Online: 2021-04-21

Publish Date: 2019-07-25

Abstract

Abstract

Based on the ionospheric correction data of Global Ionospheric Map (GIM) and dual-frequency, extracting the Pacific Ocean dataset from the Jason-2 Altimeter’s Geophysical Data Set (GDR) including 38-period in 2015. The dataset is divided into small twelve cell according to the features of ionosphere over seasons and in latitude. The result shows that there is a significant difference between the GIM and the dual-frequency correction value, and the GIM correction value is generally higher than the dual-frequency correction value, indicating that GIM overestimates the ionosphere path delay, also, the difference between the GIM and the dual-frequency is related to the season and latitude. Applying the modified equation to the 2016 Jason-2 annual data, the corrected GIM value is very close to the dual-frequency correction value, and the applicability of the modified equation remains the same over time. In the case where the single-frequency altimeter cannot use the ionospheric dual-frequency correction algorithm, the GIM value of the altimeter of the same height can be corrected by using the correction equations of different quarters and different latitude regions to achieve the accuracy level of the dual-frequency correction value.
- radar altimeter,
- ionospheric path delay,
- dual-frequency correction algorithm,
- global ionospheric map

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References(13)

References

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