Mobile distance measurement in water.
Mobile distance measurement in water.
(OP)
Looking for an existing production device or one that can be modified to alarm once a pre-determined distance between two devices has been exceeded.
Distance will be less than 50m.
Devices will be mobile.
Must function in salt water.
Accuracy +/- 10%
Smaller the better.
Other ideas welcome. (Am already reviewing http://www.bluesoft-inc.com/)





RE: Mobile distance measurement in water.
Do both objects need to know?
TTFN
RE: Mobile distance measurement in water.
RE: Mobile distance measurement in water.
Were you intending to keep part of it above water?
TTFN
RE: Mobile distance measurement in water.
My thinking was directed to wireless by the several manafacturers who are producting short range radio equipment for divers. (http://www.suunto.com/pls/suunto/suunto2.pubmainpage.frameset) as well as the some of the clubs I saw when researching, who are devoted to radio control Submarines (Fresh and Salt water)
Any ideas welcome however.
RE: Mobile distance measurement in water.
Well good luck,Joe
RE: Mobile distance measurement in water.
RE: Mobile distance measurement in water.
Problem is most commercial acoustic positioning systems are likely overpriced and oversized for your application. The cheaper end of the APS market includes:
http://www.ore.com/lxt.htm
http://www.link-quest.com/ see TrackLink 1500LC
http://www.desertstar.com/newsite/positioning/pilot/pilot.html
The above products are designed for a surface ship to track range and bearing of one or several underwater targets rather than for two underwater vehicles to track each other. Note that false alarm rates and outliers can be high even with a top of the line APS.
Some diver hand held devices might be better suited to your application - one place to check is http://www.rjeint.com/.
Dive Scan (http://www.rjeint.com/pdf/dive_scan.pdf) looks promising if you can overcome a few hurdles: need to aim in general direction of other target; must fiddle with the electronics to key on and if you want a digital output; and most importantly the other underwater vehicle must be big and reflective otherwise this device won't pick it up.
Do you have more details on your application to help narrow the search? Which radio controlled submarine clubs were you looking at?
RE: Mobile distance measurement in water.
I was going down the acoustic path and the links you provided were excellent.
One of the sites was http://www.subcommittee.com/