An intercomparison of an acoustic remote current sensor and Aanderaa current meters in an estuary

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Abstract
An intercomparison experiment of a single-axis bistatic acoustic remote current sensor and Aanderaa current meters was conducted during the fall of 1978 in the Patuxent River near Solomons Island. The acoustic sensors were located on a platform at a mean water depth of 15 m and the acoustic axis pointed essentially downstream. The transmit frequency was set at 270 kHz, and the received signal was cabled to shore and heterodyned to 5 kHz. Up to 128 tone bursts of 10-ms duration were transmitted at 1-s repetition time every 15 min. The back-scattered volume reverberation data were analog recorded, subsequently digitized, and spectrally analyzed. The spectral estimates of the Doppler shift are derived for a number of range intervals and are compared with Aanderaa current speeds projected along the acoustic axis of the remote sensor. The comparison of the time series (15-min intervals) extends over a number of tidal cycles.

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