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From: "Ken Taylor"
Subject: Re: How can a "beacon" be track down by a satellite???
Date: Mon, 20 Jan 2003 13:20:57 +1300
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"Glenn Ashmore" wrote in message
> 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
> > is determined only with sufficient accuracy (~20km) that an aircraft can
> > sent to the general area. Also, the 'lost party' must crash within range
> > a ground station. The newer system uses GPS and you may crash anywhere
> > like.
> Glenn Ashmore
> I'm building a 45' cutter in strip/composite. Watch my progress (or lack
> there of) at: http://www.rutuonline.com
> Shameless Commercial Division: http://www.spade-anchor-us.com
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