Title: Shipboard apparatus for measuring ocean currents

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Abstract: A survey ship proceeds along a desired track as determined by precision navigational aids. A doppler sonar is programmed to receive returns from various water masses circulating at various depths between the ship and the water bottom. The doppler sonar scans the different depths by changing the signal return-time window. The ship's track resolved with the water-current velocity components to obtain a resolved water current vector. The doppler sonar may be an integral part of the navigation system. In such a case, the doppler sonar will be commanded to lock on the water bottom at selected intervals to determine the true ship's track and at other intervals, the sonar will track one or more water masses. Alternatively, two sonar signal receivers may be used, one to continuously track the water bottom and one to scan the water masses at various depths.


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