2) over a tipycal speed, the GPS can not follow the satellites
I think it is two good thinks, but my english is a more real problem!
Bye.
My reveicer is Magellan and trains are electrical. I can get positioning
almost everywhere else but in a train the receiver doesn't find any
satellites. Sometimes if I have a good "sight" to satellites and go quickly
into a train (in a train quickly to window) the receiver remains in contact
with satellites. How is this to be explained?
Harri Laitinen, Finland
In article <86nu9n$fuu$1...@news.kolumbus.fi>, Harri Laitinen wrote:
> I can get positioning
> almost everywhere else but in a train the receiver doesn't find any
> satellites
>
Some trains have coated windows, thus preventing reception.
Regards, Helmuth
--
Home page: http://www.schutzeich.de
Virtual Access 5.01 build 301, WinNT4 build 1381
Edited: Thu, 27 Jan 2000 12:22 +0100 CET
Replies only in NG please.
hl> Can anyone explain why my handheld GPS -device is not functioning in a
hl> train?
It is the same with my GARMIN 12 XL (handheld).
hl> My reveicer is Magellan and trains are electrical.
I think this could be a good reason. The voltage of the electric power
line above your train is very high (in German we are use 15.000 Volt) so
the week satellite signal will be corrupted by the much higher power line
of the train.
In some small trains with diesel-traction I get contact to the satellites
when I open the window of the train. Unfortnuatly in many newer german
trains it is unpossible to open the windows.
hl> almost everywhere else but in a train the receiver doesn't find any
hl> satellites.
hl> Sometimes if I have a good "sight" to satellites and go
hl> quickly into a train (in a train quickly to window) the receiver remains
hl> in contact with satellites. How is this to be explained?
You do not need REAL optical contact to the satellite-sky above you to get
the data-signals. Nessecary is an "radio contact" to the really weak
satellite data signals.
For example: Walking with your GPS through a wood near your home and
device will see satellites normally because the data-signals can reach
your GPS without great problems.
Do the same trip after a heavy rain and power off the GPS when you are
deep inside a wood with high deciduous trees. Walk a few distance and
power the GPS-device ON again. I am very sure that the device needs a
longer time to find it own position on the world, than you make the same
experimence outside the wood.
The reason is that the rain on the pages of the trees will interrupt the
radio-connection to your GPS reciver.
Enjoy your GPS. It make fun --- Martin , Germany
--
Amicales salutations / kind regards / mit freundlichen Gruessen,
Jean-Francois DURANT
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