High-frequency sea level variations observed by GPS buoys using precise point positioning technique

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Title:	High-frequency sea level variations observed by GPS buoys using precise point positioning technique
Authors:	林立青;Kuo, Chung-Yen;Chiu, Kuan-Wei;Chiang, Kai-Wei;Cheng, Kai-Chien;Lin, Li-Ching;Tseng, Hong-Zeng;Chu, Feng-Yu;Lan, Wen-Hau;Lin, Hsiang-Tseng
Contributors:	地球科學學院地球科學前瞻應用研究中心
Keywords:	Accuracy;Buoy data;Buoy systems;Buoys;Computation;Decomposition;Gauges;Global navigation satellite system;Global positioning systems;GPS;GPS buoy;High-frequency sea level variation;Positioning systems;Precise point positioning;Products;Records;Root-mean-square errors;Satellite navigation systems;Satellite orbits;Sea level;Sea level changes;Sea level measurements;Sea level monitoring;Sea level variations;Sea surface;Tide gauge;Tide gauges;Tides;Variation
Date:	2012-04-01
Issue Date:	2026-04-23 11:25:41 (UTC+8)
Publisher:	Chinese Geoscience Union;Taiwan: 中華民國地球科學學會
Abstract:	摘要： In this study, sea level variation observed by a 1-Hz Global Positioning System (GPS) buoy system is verified by comparing with tide gauge records and is decomposed to reveal high-frequency signals that cannot be detected from 6-minute tide gauge records. Compared to tide gauges traditionally used to monitor sea level changes and affected by land motion, GPS buoys provide high-frequency geocentric measurements of sea level variations. Data from five GPS buoy campaigns near a tide gauge at Anping, Tainan, Taiwan, were processed using the Precise Point Positioning (PPP) technique with four different satellite orbit products from the International GNSS Service (IGS). The GPS buoy data were also processed by a differential GPS (DGPS) method that needs an additional GPS receiver as a reference station and the accuracy of the solution depends on the baseline length. The computation shows the average Root Mean Square Error (RMSE) difference of the GPS buoy using DGPS and tide gauge records is around 3 - 5 cm. When using the aforementioned IGS orbit products for the buoy derived by PPP, its average RMSE differences are 5 - 8 cm, 8 - 13 cm, decimeter level, and decimeter-meter level, respectively, so the accuracy of the solution derived by PPP highly depends on the accuracy of IGS orbit products. Therefore, the result indicates that the accuracy of a GPS buoy using PPP has the potential to measure the sea surface variations to several cm. Finally, high-frequency sea level signals with periods of a few seconds to a day can be successfully detected in GPS buoy observations using the Ensemble Empirical Mode Decomposition (EMD) method and are identified as waves, meteotsunamis, and tides. 出版者： Taiwan: 中華民國地球科學學會出版日期： 2012-04-01 出處： TAO : Terrestrial, atmospheric, and oceanic sciences, 2012-04, Vol.23 (2), p.209-218 資源來源：華藝線上圖書館版權： 2012. This work is licensed under https://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. 識別號： ISSN: 1017-0839 識別號： ISSN: 2223-8964 識別號： ISSN: 2311-7680 識別號： EISSN: 2311-7680 識別號： DOI: 10.3319/TAO.2011.10.05.01(Oc)
Appears in Collections:	[Research Center for Advanced Science and Technology] journal & Dissertation

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