Nevertheless, the demonstrations show the 'control speed' display on the
dash changing as the car passes the sign displaying the new speed limit.
And this isn't just off government film, but motoring journalists driving
the car on public roads.
PaulH.
----- Original Message -----
From: James Nazarian Jr <James.Nazarian@Colorado.EDU>
To: <ATWEDITOR@aol.com>
Cc: <mvheim@studiolimage.com>; <mgs@autox.team.net>
Sent: Wednesday, January 05, 2000 8:53 PM
Subject: Re: No More Speeding in the UK?-Reply
> I don't see how our government (USA) would ever allow this to happen. The
> reason that current GPS have the 30 meter error is to prevent strategic
> sites from being located too accurately. If the is a random 30 meter
> radius error then hitting a strategic target becomes nearly impossible.
> This error is built in by the government for this reason. The government
> GPS gear is much more accurate. If you are talking about GPS accurate to
> within 1 or 2 meters this could be seen as a threat to the targets that
> the current system is designed to protect.
>
> James Nazarian
> '71 B roadster
> '71 BGT rust free and burnt orange
> '74 BGT going by-by soon
> '63 Buick 215
>
> On Wed, 5 Jan 2000 ATWEDITOR@aol.com wrote:
>
> >
> > In a message dated 1/5/00 11:41:40 AM, mvheim@studiolimage.com writes:
> >
> > << Having used a GPS satellite receiver for navigation at sea I can't
> > imagine that this would really work as advertised. For one thing you
> > aren't getting continuous data, which makes any calculations of
> > instantaneous speed pretty shaky. As it updates the display every few
> > seconds, you get varying readouts along these lines: 6.1 knots, 5.9,
7.4,
> > 0.0, 5.5, 3.7, etc. Part of the problem is that it's redoing the whole
> > position calculation from scratch each time, with a 30-meter error
> > radius. >>
> >
> > GPS can provide this information, it depends on the power of your
onboard
> > computer to extract it. It is done in aviation. Further, a new
generation
> > of "correction" systems, called the Wide Area Augmentation System for
the
> > enroute environment, will nail the accuracy down to a couple of meters.
> > These are in the works for the developed nations, and use in part
signals
> > from geosynchronous communications satellites operated by Inmarsat.
> > So the unfortunate conclusion is that it is possible. Sad, ain't it.
> >
> > Jay Donoghue
> > 72 MGB
> > 66 Mustang
> >
>
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