From owner-freebsd-hackers Thu May 4 0:47: 0 2000 Delivered-To: freebsd-hackers@freebsd.org Received: from server1.huntsvilleal.com (server1.huntsvilleal.com [63.147.8.7]) by hub.freebsd.org (Postfix) with ESMTP id 22F1A37B78E for ; Thu, 4 May 2000 00:46:57 -0700 (PDT) (envelope-from kris@hiwaay.net) Received: from barricuda.bsd.nws.net (kris.huntsvilleal.com [63.147.8.46]) by server1.huntsvilleal.com (8.9.3/8.9.3) with ESMTP id CAA21158; Thu, 4 May 2000 02:24:25 -0400 Received: from localhost (localhost [127.0.0.1]) by barricuda.bsd.nws.net (8.9.3/8.9.3) with ESMTP id BAA06359; Thu, 4 May 2000 01:47:00 -0500 (CDT) (envelope-from kris@hiwaay.net) Date: Thu, 4 May 2000 01:47:00 -0500 (CDT) From: Kris Kirby To: Matthew Dillon Cc: Warner Losh , hackers@FreeBSD.ORG Subject: Re: GPS heads up In-Reply-To: <200005040303.UAA66590@apollo.backplane.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG > SA can *not* be averaged out. People... SA is NOT NOISE. I will > repeat that. SA is NOT NOISE. SA is an intentional error > introduced by the satellites that looks like a drunk walking around > the town. It takes a lot of readings over a long period of time > (read: at least a couple of days) for any sort of averaging to > yield a worthwhile result. Two points: 1. The drunken walker idea is rather accurate if you look at a plot. 2. We've actually observed sine-wave like disturbances affecting the plot. It was SA's induced error, plotted over a few hours. ----- Kris Kirby, KE4AHR | TGIFreeBSD... 'Nuff said. | ------------------------------------------------------- "Fate, it seems, is not without a sense of irony." To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message