Vessel-mounted ADCP

Abstract

Vessel Mounted Acoustic Doppler Current Profiler (vmADCP) data were collected from a hull-mounted RDI 75 kHz instrument with a range of approximately 30 – 600m. The instantaneous current field and depth were continuously monitored by a VmDas acquisition system and collected on a dedicated service computer, together with navigation data (time, position, heading and tilt), for the determination of the alignment of the vmADCP relative to the Seapath GPS antenna. Note external sources were used in preference to the internally-available ADCP compass and tilt sensor, for both increased accuracy and consistency with other measurements made onboard. This data was collected in files up to 15MB in size, and regularly transferred to the appropriate directory of the ship’s computer network.