In message , Tim
writes
On Thu, 23 Sep 2004 15:57:55 +0000, Peter Masson wrote:

(Can GPS identify which line the train is on if adjoining
platforms are different lengths?)

Not with any certainty.

Of course, what happens if the Pentagon decided to turn off GPS for
civilian use without warning (which they've always stated they have the
right to do)?

Or worse, they have a war and introduce deliberate errors into the system
designed to confuse the enemy?

I can see it now on the 9:24 from Tonbridge: "We will shortly be arriving
at Copenhagen, please mind the step"

I know that Europe is going to deploy it's own GPS sats, but I don't know
when that will be.

Timbo

The European system is already being deployed, the first satellite is
already up (of course you need at least 4 for a good position),
forgotten the name of the system though..
The Russians have their own system called GLASNOSS and the Chinese have
also started sending up satellites so they have their own version as
well.
--
Regards,

James Christie

"In the beginning the Universe was created. This has made a lot of people very
angry and been widely regarded as a bad move."
- Douglas Adams

In message , James Christie
writes
In message , Tim
writes
On Thu, 23 Sep 2004 15:57:55 +0000, Peter Masson wrote:

(Can GPS identify which line the train is on if adjoining
platforms are different lengths?)

Not with any certainty.

Of course, what happens if the Pentagon decided to turn off GPS for
civilian use without warning (which they've always stated they have the
right to do)?

Or worse, they have a war and introduce deliberate errors into the system
designed to confuse the enemy?

I can see it now on the 9:24 from Tonbridge: "We will shortly be arriving
at Copenhagen, please mind the step"

I know that Europe is going to deploy it's own GPS sats, but I don't know
when that will be.

Timbo

The European system is already being deployed, the first satellite is
already up (of course you need at least 4 for a good position),
forgotten the name of the system though..
The Russians have their own system called GLASNOSS and the Chinese have
also started sending up satellites so they have their own version as
well.

********, its GLONASS, I ALWAYS get that the wrong way round......
--
Regards,

James Christie

"In the beginning the Universe was created. This has made a lot of people very
angry and been widely regarded as a bad move."
- Douglas Adams

"James Christie" wrote in message
...

********, its GLONASS, I ALWAYS get that the wrong way round......

Your gonads are inverted???!!! :-)

--
MatSav

James Christie wrote:

The Russians have their own system called GLASNOSS


You have to be joking.

In article ,
TP wrote:
James Christie wrote:

The Russians have their own system called GLASNOSS

You have to be joking.


GLONASS. Can't recall off-hand how many satellites are in the
constellation at the moment, but they've been keeping it topped up.
In general GPS is better for accuracy at low latitudes, GLONASS
better at high latitudes. A high proportion of "GPS" receivers
are actually dual GPS/GLONASS.

--
Andy Breen ~ Interplanetary Scintillation Research Group
http://users.aber.ac.uk/azb/
"Time has stopped, says the Black Lion clock
and eternity has begun" (Dylan Thomas)

On Thu, 23 Sep 2004 22:32:22 UTC, TP wrote:

: James Christie wrote:
:
: The Russians have their own system called GLASNOSS

: You have to be joking.

Maybe he is. I think it's called GLONASS.

Ian