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High-rate local sea level monitoring with a GNSS-based tide gauge

Johan Löfgren (Institutionen för rymd- och geovetenskap, Rymdgeodesi och geodynamik) ; Rüdiger Haas (Institutionen för rymd- och geovetenskap, Rymdgeodesi och geodynamik) ; Jan M. Johansson (Institutionen för rymd- och geovetenskap, Rymdgeodesi och geodynamik)
Proceedings of the 2010 IEEE International Geoscience and Remote Sensing Symposium, Proceedings DVD-ROM p. 3616-3619. (2010)
[Konferensbidrag, övrigt]

We present first results from the analysis of high-rate observations with a GNSS-based tide gauge at the Onsala Space Observatory. The goal is to determine local sea level with high temporal resolution. The GNSS-based tide gauge makes use of right-hand circular polarized GNSS signals that are directly received and left-hand circular polarized GNSS signals that are reflected from the sea surface. An experimental setup of the GNSS-based tide gauge was operated in the spring of 2010 and data were recorded with a sampling rate of 20 Hz. We analyzed data decimated to 1 Hz using different temporal resolution between 5 and 240 seconds, and the resulting time series of local sea level were compared to each other and to results from two stilling well gauges. The comparison with the data from the stilling well gauges shows a common trend. The comparison of the results from analyses with different temporal resolution show consistent results. There is also an indication that the GNSS-based tide gauge might be able to give information on the sea surface state.

Nyckelord: GNSS, reflected signals, local sea level, tide gauge



Denna post skapades 2010-10-29. Senast ändrad 2016-05-24.
CPL Pubid: 128335