We describe a 3-beam pulse-to-pulse coherent acoustic Doppler profiler (PC-ADP). The system is self contained and is using its own CPU and digital signal processor (DSP) to collect the Doppler velocity and acoustic backscatter information. PC-ADPutilizes the pulse-coherent Doppler processing which allows it to make very accurate velocity measurements combined with high temporal and spatial resolution. Tow tank tests demonstrated a single-ping velocity uncertainty of order 7 mm/s for themeasurements gathered at 2 Hz with 1.6-cm resolution.
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