From owner-freebsd-hackers Sat May 6 11:46:48 2000 Delivered-To: freebsd-hackers@freebsd.org Received: from mass.cdrom.com (adsl-63-202-176-114.dsl.snfc21.pacbell.net [63.202.176.114]) by hub.freebsd.org (Postfix) with ESMTP id 6562F37BC0D; Sat, 6 May 2000 11:46:40 -0700 (PDT) (envelope-from msmith@mass.cdrom.com) Received: from mass.cdrom.com (localhost [127.0.0.1]) by mass.cdrom.com (8.9.3/8.9.3) with ESMTP id LAA07340; Sat, 6 May 2000 11:55:32 -0700 (PDT) (envelope-from msmith@mass.cdrom.com) Message-Id: <200005061855.LAA07340@mass.cdrom.com> X-Mailer: exmh version 2.1.1 10/15/1999 To: nate@yogotech.com (Nate Williams) Cc: Mike Smith , hackers@FreeBSD.ORG Subject: Re: [OT] Finding people with GSM phones (was Re: GPS heads up ) In-reply-to: Your message of "Sat, 06 May 2000 12:40:42 MDT." <200005061840.MAA18274@nomad.yogotech.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Sat, 06 May 2000 11:55:32 -0700 From: Mike Smith Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG > > 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. Well, assuming they have 100% antenna overlap (not unlikely) you could just do phase comparisons between the antennae getting the squirt. If these guys are as smart as you say (and I have no doubt at all about that), 25m at near distance is probably not unrealistic. Ask him if they can still do it at 35km out (the outer limit for a normal GSM cell). That'd really spook me. 8) -- \\ Give a man a fish, and you feed him for a day. \\ Mike Smith \\ Tell him he should learn how to fish himself, \\ msmith@freebsd.org \\ and he'll hate you for a lifetime. \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message