GNSS low-cost prototype on ship for caching tsunami wave propagation

Description

Ship navigation data records are proposed to be complementary information for monitoringoffshore tsunami currents following great earthquakes. Offshore GPS measurements on theresearch vessel Kilo Moana of the University of Hawaii following the 2010 Mw 8.8 Mauleearthquake have illustrated the potential of GPS kinematic positioning solutions, together with afiltering approach, for detecting the ship's vertical displacement promoted by the tsunami travelvelocity. However, kinematic positioning of GPS observations on ships is challenging due to theload, ship speed, and wavefield changes on the open ocean that might produce fast changes in theship's drift and vertical motion. Wavefield could also introduce additional noise frequencies to theGPS positioning, thus decreasing its precision. Herein, we present a dual-frequency Global SatelliteNavigation System (GNSS) low-cost prototype based on the Septentrio Mosaic-X5 card and a lowcostAS-ANT2BCAL antenna. Such a low-cost GNSS station has been installed on a non-commercialship fleet in order to assess the precision and noise content of offshore GNSS positioning andionosphere Total Electron Content measurements. We discuss our preliminary results bycomparing the precision of the multi-GNSS solution (GPS, GLONASS, Galileo) relative to the onefrom only the GPS solution using both long-baselines and Precise Point Positioning approaches inpost-processing mode. In the second step, we simulate a real-time multi-GNSS positioning solutionto evaluate their ability to catch wavefield changes. We finally discuss the detectability of tsunamiswith the newly developed GNSS low-cost prototype under various conditions.Powered by

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