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From: Glenn Ashmore
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:0.9.4) Gecko/20011128 Netscape6/6.2.1
Subject: Re: How can a "beacon" be track down by a satellite???
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NNTP-Posting-Date: Sun, 19 Jan 2003 18:46:04
Date: Sun, 19 Jan 2003 18:59:20 -0500
I don't know how they do it but my 406 EPIRB triggered accidentally this
summer because the case leaked in a rain storm. I got a call from the
Coast Guard and they knew it was within a mile and a half of the marina
it was actually in. That was without GPS encoding. With the GPS code
they would have known within about 15'.
J. Harvey wrote:
> Satellites that track rescue beacons do not use "triangulation" as such.
> The older systems depend upon analysis, at the ground station, of the
> Doppler shift imposed by the orbital motion of the satellite. The location
> is determined only with sufficient accuracy (~20km) that an aircraft can be
> sent to the general area. Also, the 'lost party' must crash within range of
> a ground station. The newer system uses GPS and you may crash anywhere you
I'm building a 45' cutter in strip/composite. Watch my progress (or lack
there of) at: http://www.rutuonline.com
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