Acoustic Doppler Current Profiler (ADCP) Velocity Verification Experiments in the Navy's Large Cavitation Channel (LCC)
2007
Chirchella, Dylan A.
The Resistance and Powering Division (Code 5200) of The Naval Surface Warfare Center, Carderock Division (NSWCCD) conducted verification experiments on a 20 degree Acoustic Doppler Current Profiler (ADCP) unit produced by RD Instruments (RDI) of San Diego, California. These experiments were conducted in the Navy's Large Cavitation Channel (LCC) located in Memphis, Tennessee. Although they have many other possible future uses, currently the ADCP units tested during this series are used to profile flow and determine speed through the water on ships during at-sea trials. The purpose of this Report is to present the accuracy of the ADCP units in determining speed through the water. Data collected with the ADCP units are compared to data collected by the LCC's Laser Doppler Anemometer (LDA) system, which provides highly accurate water velocity data. The experimental results indicate excellent agreement between the ADCP and LDA. Based on the experimental results, it is recommended that the ADCP is operated using water mode 12 and an ambiguity velocity of 700 cm/s during future sea trials. The experimental results indicate the ADCP agrees with LDA within +/-0.2 knots on average when these settings are used.
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