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Lookup NU author(s): Dr Nigel Penna, Professor Philip Moore, Dr Miguel Morales MaquedaORCiD, Dr Ian Martin, Dr Jing Guo, David Gregg
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IEEEThe concept of in-situ multi-satellite altimetry calibration and validation in the absolute sense using ocean autonomous surface vehicles as GNSS platforms is demonstrated through an experiment in the North Sea during 2016. A Wave Glider equipped with geodetic GNSS travelled to locations ranging from 21 to 78 km from the coast to be directly under four Jason-series tracks and two CryoSat-2 tracks. 5-Hz sea surface heights were estimated from precise point positioning mode processing of GPS+GLONASS data, together with hourly zenith wet tropospheric delays, and used as reference values for altimetry satellite measured sea surface height, tropospheric delay and significant wave height. Sea surface height biases obtained were −30 to −8 mm for Jason-2 using GDR-D products, −40 to +1 mm for Jason-3 using GDR-F products, and −29 mm and +18 mm for CryoSat-2 using SAR mode GOP baseline C products. These biases are almost commensurate with results from previous studies in other regions which used GNSS buoys or onshore GNSS reference stations with geoid and tide extrapolation. The Jason-2 and Jason-3 microwave radiometer-measured zenith wet tropospheric delays differed respectively by −15 mm and −10 mm on average from those measured by the GNSS Wave Glider. Root mean square significant wave height differences of 2-6 cm were obtained between Jason-2/3 and the co-located GNSS Wave Glider, and equivalent differences of 19-21 cm for CryoSat-2.
Author(s): Penna NT, Moore P, Morales Maqueda MA, Martin I, Cipollini P, Guo J, Foden PR, Gregg DE
Publication type: Article
Publication status: Published
Journal: IEEE Transactions on Geoscience and Remote Sensing
Year: 2024
Volume: 62
Online publication date: 08/07/2024
Acceptance date: 08/06/2024
ISSN (print): 0196-2892
ISSN (electronic): 1558-0644
Publisher: Institute of Electrical and Electronics Engineers Inc.
URL: https://doi.org/10.1109/TGRS.2024.3424649
DOI: 10.1109/TGRS.2024.3424649
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