Newsgroups: comp.robotics
Path: brunix!uunet!nic.unh.edu!newshost.unh.edu!rg
From: rg@msel.unh.edu (Roger Gonzalez)
Subject: Re: breaking free
In-Reply-To: "dan meyer"'s message of 27 Mar 92 18: 13:00 EST
Message-ID: <RG.92Mar30083746@nymph.msel.unh.edu>
Sender: news@nic.unh.edu (USENET News System)
Organization: UNH Marine Systems Engineering Lab
References: <1992Mar27.1483.1618@dosgate>
Distribution: comp
Date: Mon, 30 Mar 1992 13:37:46 GMT

>>>>> "dan" == dan meyer <dan.meyer@canrem.com> writes:
	dan>  Does anyone have information about a remote control system that could
	dan> be used under water at a max. depth of 50 feet? I would require a range
	dan> of preferably 100-500 Feet but 50 feet would be fine if worst comes to
	dan> worst. As well what are the possibilities of having a wireless B&W video
	dan> camera running underwater? (obviously not exposed.) I hope to here so
	dan> replies soon! Thanks!

If you're talking fresh water, any RF modem should do the trick.  I don't
think this will work well in salt water.  The other main option is acoustics,
and thanks to WHOI, the bandwidth of this is now finally getting into a
useable range.

My lab has used MAPS compressed video at reduced resolution/depth/fps over
9600bps links, but not much is usable below this rate.  There is a "bible"
from MIT in the 70's (?) on what parameters you can vary when trying to reduce
the bandwidth of video.

-Roger

--
"The question of whether a computer can think is no more interesting
 than the question of whether a submarine can swim" - Edsger W. Dijkstra 

Roger Gonzalez   -  rg@msel.unh.edu
Division of Bit Banging and Reluctant Robotics
UNH Marine Systems Engineering Laboratory, Durham, NH  03824-3525
(603) 862-4600 -4399 (fax)

