From owner-freebsd-hackers Wed May 3 22:36:44 2000 Delivered-To: freebsd-hackers@freebsd.org Received: from critter.freebsd.dk (critter.freebsd.dk [212.242.40.131]) by hub.freebsd.org (Postfix) with ESMTP id A962C37B608 for ; Wed, 3 May 2000 22:36:41 -0700 (PDT) (envelope-from phk@critter.freebsd.dk) Received: from critter.freebsd.dk (localhost.freebsd.dk [127.0.0.1]) by critter.freebsd.dk (8.9.3/8.9.3) with ESMTP id HAA02290; Thu, 4 May 2000 07:36:05 +0200 (CEST) (envelope-from phk@critter.freebsd.dk) To: Matthew Dillon Cc: Warner Losh , hackers@FreeBSD.ORG Subject: Re: GPS heads up In-reply-to: Your message of "Wed, 03 May 2000 20:03:48 PDT." <200005040303.UAA66590@apollo.backplane.com> Date: Thu, 04 May 2000 07:36:05 +0200 Message-ID: <2288.957418565@critter.freebsd.dk> From: Poul-Henning Kamp Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG In message <200005040303.UAA66590@apollo.backplane.com>, Matthew Dillon writes: >: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 > > SA can *not* be averaged out. People... SA is NOT NOISE. SA *can* be averaged out, it has an average value of zero. But it takes several days or even weeks to get into the centimeter range, depending on the satelite coverage where you are. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD coreteam member | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message