Estimation of the Resolution Capability of the Cryosat-2 Altimeter

ZHANG Shengjun; JIN Taoyong; CHU Yonghai; KONG Xiangxue

doi:10.13203/j.whugis20140829

Volume 41 Issue 6

Jun. 2016

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Geomatics and Information Science of Wuhan University > 2016 > 41(6): 759-764. > DOI: 10.13203/j.whugis20140829

ZHANG Shengjun, JIN Taoyong, CHU Yonghai, KONG Xiangxue. Estimation of the Resolution Capability of the Cryosat-2 Altimeter[J]. Geomatics and Information Science of Wuhan University, 2016, 41(6): 759-764. DOI: 10.13203/j.whugis20140829

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Estimation of the Resolution Capability of the Cryosat-2 Altimeter

School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China

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The National Basic Research Program (973 Program) of China No.2013CB733301

the National Natural Science Foundation of China Nos.41210006,41304003

the National High Technology Research & Development Program (Program 863) of China No.2013AA122502

the Open Funds of the Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan University No.15-02-09

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Author Bio:
ZHANG Shengjun, PhD candidate, specializes in satellite altimeter data processing. E-mail: zhangshengjun@whu.edu.cn
Received Date: March 26, 2015
Published Date: June 04, 2016

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Abstract

The cryosat-2 satellite recently published its first altimeter dataincluding periodically drifting orbit and dense ground tracks. These data can be used to improve the accuracy and resolution of the marine gravity field. In this paper, we constructs auto-regressive models of the altimeter data series by considering two aspects of signal and noise, and propose a new method called the signal-to-noise ratio analytical method for estimating the resolution capability of Cryosat-2 data. in five test cases, this new method offers a consistent alternative to the traditional spectral correlation method. The resolution capability of Cryostat-2 altimeter data from single cycle is in the range of 23 km~33 km, with an average value of 27 km, and better than 38 km, 43 km and 37 km of the Geosat/ERM, ERS-1/ERM and T/P data. This result shows that the Cryosat-2 altimeter data has a lower noise level and a higher geoid signal recognition. Therefore, it is reasonable to believe that the Cryostat-2 could provide shorter wavelength information for the construction of marine gravity field with higher resolution.
- satellite altimetry,
- geoid,
- resolution capability,
- spectral correlation,
- signal-to-noise ratio

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