The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
From: "Ken Taylor"
Subject: Re: How can a "beacon" be track down by a satellite???
Date: Mon, 20 Jan 2003 13:20:57 +1300
NNTP-Posting-Host: 219-88-64-2.adsl.xtra.co.nz (18.104.22.168)
X-Newsreader: Microsoft Outlook Express 6.00.2720.3000
"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
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup