Date: Wed, 03 May 2000 20:30:48 -0600 From: Warner Losh <imp@village.org> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: hackers@FreeBSD.ORG Subject: Re: GPS heads up Message-ID: <200005040230.UAA36034@harmony.village.org> In-Reply-To: Your message of "Wed, 03 May 2000 16:13:40 PDT." <200005032313.QAA65552@apollo.backplane.com> References: <200005032313.QAA65552@apollo.backplane.com> <200005031744.KAA63550@apollo.backplane.com> <20000503200006.A35116@cichlids.cichlids.com> <200005031957.NAA01354@nomad.yogotech.com> <20000503130759.A15403@orion.ac.hmc.edu> <20000503221528.A37472@cichlids.cichlids.com> <20000503151513.D337@beastie.localdomain>
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In message <200005032313.QAA65552@apollo.backplane.com> Matthew Dillon writes: : No, you can't just average several measurements w/ SA on and expect : to get any improvement. SA isn't just 'noise', it's like a : drunken walker. All you get when you average several measurements : is the location of the drunk. The SA can be averaged out, but you need to have another source of time as well as GPS. GPS alone will give you a grid square you are in, but the nature of the pseudorandom noise is such that you don't get a nice sine wave (collapsing for a moment to 1 dimention). It is much more distorted than that. Warner To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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