AXYS Technologies

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The HydroLevel™ buoy uses the NCT-2050G StarFire GPS receiver to provide real time accurate three dimensional position by the Global Differential Global Positioning System (GDGPS), which, when used during hydrographic surveys will enable the depth & contours of the seabed to be corrected for the true water surface elevation changes as measured on the absolute three dimensional WGS 84 earth centered, earth fixed (ECEF) reference frame using GPS real time kinematic (RTK) or post- processed (PPK) techniques. GDGPS measurements provide solid earth tide corrections and the HydroLevel™ buoy GPS receiver incorporates these real-time correctors at the position and time measured by the GPS receiver. In addition to position measurement, a motion sensor on the buoy measures the pitch, roll and heading of the buoy in real-time. Along with the position of the GPS antennae, the pitch, roll and heading are used to calculate the true position GPS antenna, and therefore of the water level in which the buoy is floating. The earth tide corrections, pith, roll and heading data are all supplied to the buoy processor, which performs the necessary tilt corrections, averaging and filtering. GPS data o...read more

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