Ocean Wave Measurement Using GPS Buoys

Ocean Wave Separation Using CEEMD-Wavelet in GPS Wave Measurement

Monitoring ocean waves plays a crucial role in, for example, coastal environmental and protection studies. Traditional methods for measuring ocean waves are based on ultrasonic sensors and accelerometers. However, the Global Positioning System (GPS) has been introduced recently and has the advantage of being smaller, less expensive, and not requiring calibration in comparison with the tradition...

Open Ocean Surface Wave Measurement Using Doppler Sonar

In October-November 1983, Doppler sonars mounted on the research platform Flip were used to scatter 75-kHz sound from the underside of the sea surface at low angle, as well as from the interior of the mixed layer. Surface gravity waves were seen in velocity estimates from the surface scattering sonar, even though the wave conditions were unusually calm. Valid measurements of sea surface motion ...

Bistatic Ocean Wave Remote Sensing System by GPS

Underwater Acoustic Positioning Systems Based on Buoys with Gps

The paper addresses the general problem of estimating the position of an underwater target carrying an acoustic emitter by measuring the times of arrival (TOAs) of the acoustic signals at a set of surface buoys equipped with submerged hydrophones and GPS receivers. Examples of underwater targets of interest include AUVs (Autonomous Underwater Vehicles) and ROVs (Remotely Operated Vehicles) as w...

Envisat Radar Altimeter Calibration with High-sea Gps Buoys

The environmental satellite ENVISAT was successfully launched by the European Space Agency ESA in March 2002 and carries among other sensors a radar altimeter which is capable of measuring the height between sea surface and satellite with a precision of a few centimetres. Unfortunately, radar altimeters of this kind exhibit a bias which cannot be determined à priori with help of laboratory meas...