Not a submariner, never been in the navy, etc.
With that out of the way, I'd think you could utilize the various hydrophone locations on the subs hull to determined depth. Sound radiates as a wave, so different parts of the wave front will contact the hull at different times (probably miliseconds apart, but enough to matter). For example if the hydrophone on the top of the hull receives a certain sound before one located on the side of the hull, the contact is above the vessel. Add in some fancy math, and you'd have a fair guess of the depth of a contact.
|