Absolute calibration of sea surface height for HY-2A Satellite altimeter by GNSS buoy and tide gauge data

Yang Lei; Zhou Xinghua; Wang Zhaoyang; Liang Guanhui; Tang Qiuhua; Zhou Dongxu; Lei Ning; Yang Long; Mu Bo

doi:10.3969/j.issn.0253-4193.2017.01.012

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Yang Lei, Zhou Xinghua, Wang Zhaoyang, Liang Guanhui, Tang Qiuhua, Zhou Dongxu, Lei Ning, Yang Long, Mu Bo. Absolute calibration of sea surface height for HY-2A Satellite altimeter by GNSS buoy and tide gauge data[J]. Haiyang Xuebao, 2017, 39(1): 111-120. doi: 10.3969/j.issn.0253-4193.2017.01.012

Citation:

Yang Lei, Zhou Xinghua, Wang Zhaoyang, Liang Guanhui, Tang Qiuhua, Zhou Dongxu, Lei Ning, Yang Long, Mu Bo. Absolute calibration of sea surface height for HY-2A Satellite altimeter by GNSS buoy and tide gauge data[J]. Haiyang Xuebao, 2017, 39(1): 111-120. doi: 10.3969/j.issn.0253-4193.2017.01.012

Citation:

Yang Lei, Zhou Xinghua, Wang Zhaoyang, Liang Guanhui, Tang Qiuhua, Zhou Dongxu, Lei Ning, Yang Long, Mu Bo. Absolute calibration of sea surface height for HY-2A Satellite altimeter by GNSS buoy and tide gauge data[J]. Haiyang Xuebao, 2017, 39(1): 111-120. doi: 10.3969/j.issn.0253-4193.2017.01.012

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Absolute calibration of sea surface height for HY-2A Satellite altimeter by GNSS buoy and tide gauge data

doi: 10.3969/j.issn.0253-4193.2017.01.012

1.
First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
2.
First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;College of Geodesy and Geomatics, Shandong University of Science and Technology, Qingdao 266590, China
3.
National Satellite Ocean Application Service, Beijing 100081, China

Received Date: 2016-04-15
Rev Recd Date: 2016-07-14

Abstract

Abstract

In order to determine the absolute bias of HY-2A sea surface height (SSH) and monitor the on-orbit working conditions of HY-2A Satellite altimeter, we conducted the absolute calibration experiments in the Qianliyan and Dangan area of China. In this study we adopted two independent methods which are deploying the GNSS buoy under satellite tracks for simultaneous observation and using the tide gauge data combined with the precise geoid model. In addition, for verifying the accuracy of the GNSS buoy calibration method, the Jason-2 and Saral Satellite altimeters, which were already calibrated by international calibration sites, were also calibrated using the same GNSS buoy. The SSH accuracy of the GNSS buoy is estimated to be about 2 cm by comparison with the tide gauge data. The absolute biases of Jason-2 and Saral calibrated by the GNSS buoy are 5.7 cm and -2.3 cm, which are in accordance with the results of the international calibration sites. According to the GNSS buoy the SSH absolute biases for HY-2 are determined to be -65 cm in September 2014 and -91 cm in May 2015, which are changed significantly for the two experiments. Thus in order to quantify the drift velocity of HY-2A SSH and assess the on-orbit working conditions of HY-2A Satellite altimeter more accurately, we used long time series of tide gauge data of the Qianliyan oceanic station to calibrate the cycles 56 to 73 of HY-2A. The drift phenomenon of HY-2A SSH is confirmed by the long-time series altimeter data and the drift velocity is estimated to be -51 cm/a. By the regression analysis with 95% confidence coefficient, the GNSS buoy calibration result of HY-2A is in good accordance with the result from the tide gauge data. From the result of this paper, we conclude that under the condition of no dedicate calibration site the altimeter absolute bias could be determined by GNSS buoy with flexibility and high accuracy and the drift of absolute bias could be quantified by the tide gauge data combined with the precise geoid mode.
- GNSS buoy,
- absolute calibration,
- HY-2A,
- Saral/AltiKa,
- Jason-2

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References(38)

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