Acoustic Doppler current profilers (ADCP’s) have become a common tool for measuring streamflow and profiles of water velocity. Despite their widespread use, no standard procedure has been adopted or accepted for calibration of ADCP’s. Limitations of existing facilities for testing point-velocity meters, the complexity of ADCP instruments, and rapid changes in ADCP technology are some of the rea...

The mission of an unmanned air vehicle (UAV) tethered to a small surface (USV) is considered. As opposed the majority existing UAV work, which assumes taut tether, this paper addresses challenge tether management for slack, hanging in dynamic ocean environment up sea state 4 on Douglas scale. A prototype smart reel system UAV–USV team was designed and experimentally validated controlled uncontr...

Currently, high precision kinematic GPS positioning with centimetre level accuracy can only be carried out using differential GPS (DGPS) positioning techniques which require the deployment of base receiver stations. The requirement to deploy base receiver stations, however, spatially limits the operating range of the rover receiver to about 20 km from the base stations. As a result, it not only...