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Hi David. Good work on the passive sonar. I think the most useful
application for this as you've said before is in the area of communication
between subs and/or surface craft. Once two systems are deployed and working
with each other the benefits will be seen.
As far as using it for collision avoidance, it's pretty hard to beat the
pinger devices.
Have you ever considered looking into a laser based device ?
Small laser technology has become both inexpensive and widely available in
a large range of size and strength.
I don't know much about lasers or how far through the water it would
penetrate but it could be possible to adapt something like one of those little
laser pointers to detect an object near a sub.
Frank D.
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