Date: Wed, 3 May 2000 13:07:59 -0700 From: Brooks Davis <brooks@one-eyed-alien.net> To: Nate Williams <nate@yogotech.com> Cc: Alexander Langer <alex@big.endian.de>, Matthew Dillon <dillon@apollo.backplane.com>, hackers@FreeBSD.ORG Subject: Re: GPS heads up Message-ID: <20000503130759.A15403@orion.ac.hmc.edu> In-Reply-To: <200005031957.NAA01354@nomad.yogotech.com>; from nate@yogotech.com on Wed, May 03, 2000 at 01:57:08PM -0600 References: <200005031744.KAA63550@apollo.backplane.com> <20000503200006.A35116@cichlids.cichlids.com> <200005031957.NAA01354@nomad.yogotech.com>
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On Wed, May 03, 2000 at 01:57:08PM -0600, Nate Williams wrote: > My former employer (SRI) has done lots of research, and have gotten a > receiver good to 1cm, but it takes about 24 hours for it to > 'synchronize' to that accuracy. With dual receivers, you can get 2-3 mm > accuracy by comparing the wavelength offsets, but it's really, really, > really expensive to build the hardware, and there's very little > practical use for that kind of accuracy. Actually, there's a physics professor any my old college does use that feature. He mounts them on buildings around SoCal with dataloggers to determine building movement due to earthquakes and general plate movement. -- Brooks -- Any statement of the form "X is the one, true Y" is FALSE. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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