Date: Wed, 3 May 2000 16:17:17 -0700 From: "David Schwartz" <davids@webmaster.com> To: "Matthew Hunt" <mph@astro.caltech.edu> Cc: <chat@FreeBSD.ORG> Subject: RE: GPS heads up Message-ID: <000501bfb555$b98ff450$021d85d1@youwant.to> In-Reply-To: <20000503145930.B33563@wopr.caltech.edu>
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> So, I will apply my meager knowledge of pulsar observations to > guess that the phase difference between the two frequencies gives > you the integral of the electron number density along the path, > and hence allows you to measure the delay introduced by the > ionosphere, and subtract it off? (I have read elsewhere that > the ionospheric fluctuations are the largest source of error, > aside from SA.) I was under the impression that after SA (which is now a thing of the past), the largest single source of error was that the satellites weren't precisely where they said they were. I remember reading about work to measure the position of the satellites to accuracies of fractions of a meter to eliminate this source of error. DS To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-chat" in the body of the message
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