The AN/WQX-2 is a diver-detector sonar used in anti-frogman precautions. It is in service with the US Navy. It uses Kongsberg Mesotech components. It can detect divers up to 2400 feet (= nearly half a mile) away.
The AN/WQX-2 finds range and bearing of the detected target relative to the sonar. The C3D console developed by SPAWAR converts this to a GPS position. It has software to distinguish diver echoes from shoals of fish, marine mammals, debris, bubbles from boat wakes, etc.
See also 
- Non-Lethal Swimmer Neutralization Study (about 3 megabytes)(page 3)
- National Defense Industrial Association: .ppt presentation of 42 slides, 11 MB: look for "SDS".
- C R&T Waterfront Physical Security
- Coast Guard’s Underwater Port Security
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