From: "Anthony Q. Bachler"
Subject: Re: Can anyone explain the design of tracking systems?
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Wed, 01 Jan 2003 10:59:20 GMT
NNTP-Posting-Date: Wed, 01 Jan 2003 02:59:20 PST
Organization: EarthLink Inc. -- http://www.EarthLink.net
Actually its rather circumstantial evidence, as it only proves that his cell
phone was somewhere else at the time.
The american people did to themselves
what Osama bin Laden could never do,
took away our freedoms in exchange for
a false sense of security.
"Leon Heller" wrote in message
> "Frithiof Andreas Jensen"
> in message news:firstname.lastname@example.org...
> > In GSM at least, on entering a new cell and periodically after that, the
> > handset reports the signal strengt from the nearest (up to six)
> > so that the optimal "base" site can be chosen. Not triangulation, but
> > damn close.
> > > It's not very precise, either. Cells are fairly large, so simply
> > > what cell someone's in is not very useful.
> > With GSM the accuracy in practice is in the order of 30 - 100 m; with
> > 3G/UMTS the accuarcy is ten times better, 3 - 10 m, and there are API's
> > *use* the location information for advertising etc. "localised
> > I think the name is.
> > > They don't keep records of
> > > movements between cells, either --
> > Oh Yes they *do* - for Billing Purposes. The Danish Telco's will keep
> > records for up to five years - and the Police have been supplied with
> > tracking information on requet in several court cases now.
> Someone has just been convicted of killing his niece, in the UK. He
> he was in a DIY outlet at the time she went missing, but the police found
> that he was in fact somewhere else, from the mobile phone records. This
> an important piece of evidence, as the body has not been found.
> Leon Heller, G1HSM