The IEEE Seventh Working Conference on Current Measurement Technology

Current and Wave Monitoring and Emerging Technologies

March 13-15 | Bahia Hotel | San Diego, CA, USA

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Optimizing ADCP Settings for Noise Reduction

Peter Hendricks

Status: Accepted

Naval Undersea Warfare Center
Code 8213
Newport , RI USA
02840

Phone: 401-832-2764
Email: hendrickspj@npt.nuwc.navy.mil

Co-Authors:

The performance of an RDI 600 kHz broadband ADCP is evaluated to determine the optimum settings for minimizing random noise associated with the inherent single ping uncertainty in the instrument. The parameters that are considered are bin size, maximum range and the resultant sample rate, which is the maximum the instrument is capable of for a given combination of bin size and range. The instrument¿s firmware determines the maximum sample rate as a function of range to allow round-trip travel time for the acoustic pulse between pings. The RDI noise model predicts an rms noise velocity that is inversely proportional to the bin size and inversely proportional to the square root of the sample rate for a fixed averaging time period. Data from a set of measurements recorded from an instrument on the R/V Knorr west of Scotland, while the ship was drifting, are consistent with the RDI model. Analysis of these data suggests that there is an optimum number of bins, N ~ 10, that minimizes the noise level for a specified range requirement while retaining maximum vertical resolution.

Submitted on October 11, 2002

Sponsored by the Current Measurement Technology Committee (CMTC) of the IEEE Oceanic Engineering Society.

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