From owner-freebsd-hackers Sat May 6 12:23:32 2000 Delivered-To: freebsd-hackers@freebsd.org Received: from anchor-post-30.mail.demon.net (anchor-post-30.mail.demon.net [194.217.242.88]) by hub.freebsd.org (Postfix) with ESMTP id A7CEC37BD0E; Sat, 6 May 2000 12:23:28 -0700 (PDT) (envelope-from dmlb@ragnet.demon.co.uk) Received: from ragnet.demon.co.uk ([158.152.46.40]) by anchor-post-30.mail.demon.net with esmtp (Exim 2.12 #1) id 12oAAh-000L8i-0U; Sat, 6 May 2000 20:23:27 +0100 Received: from dmlb by ragnet.demon.co.uk with local (Exim 3.03 #1) id 12oAAd-000Nxo-00; Sat, 06 May 2000 20:23:23 +0100 Content-Length: 1025 Message-ID: X-Mailer: XFMail 1.3 [p0] on FreeBSD X-Priority: 3 (Normal) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8bit MIME-Version: 1.0 In-Reply-To: <200005061855.LAA07340@mass.cdrom.com> Date: Sat, 06 May 2000 20:23:23 +0100 (BST) From: Duncan Barclay To: Mike Smith Subject: Re: [OT] Finding people with GSM phones (was Re: GPS heads up ) Cc: hackers@FreeBSD.ORG, (Nate Williams) Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On 06-May-00 Mike Smith wrote: >> > With one tower, you're down to describing an arc along which >> > the phone is probably located; still pretty good when it comes to finding >> > someone. >> >> He seemed to imply that they could get it within 25m, even with one >> phone. Like I said, I don't understand how, but I didn't question his >> ability. Plus, he knows alot more about the stuff than I do. http://www.cursor-system.com/ Cambridge positioning Systems have developed some technology to do this for GSM. Positioning isn't built into the GSM system - yes they can tell what sector of a base station a mobile is in but much more than that is difficult. The other cells a mobile is aware of aren't aware of the mobile. Duncan --- ________________________________________________________________________ Duncan Barclay | God smiles upon the little children, dmlb@ragnet.demon.co.uk | the alcoholics, and the permanently stoned. ________________________________________________________________________ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message