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Pocket GPS World :: View topic - ARTICLE COMMENTS: How GPS Works
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ARTICLE COMMENTS: How GPS Works

 
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Dave
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Joined: Sep 10, 2003
Posts: 6460
Location: UK

PostPosted: Tue Sep 16, 2003 9:24 am    Post subject: ARTICLE COMMENTS: How GPS Works Reply with quote

Please post any comments regarding the How GPS Works article here.
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BrianT
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Joined: 03/02/2003 14:17:44
Posts: 84
Location: near Geneva, Switzerland

PostPosted: Sun Apr 18, 2010 11:34 am    Post subject: Reply with quote

Thanks for the article - I much enjoyed reading it. :-)

One thing: the link at the bottom to http://science.nasa.gov/Realtime/jtrack/3d/JTrack3d.html/ came up with a "page not found". Any chance of that being updated....?

Thanks again!
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Oldboy
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Joined: Dec 08, 2004
Posts: 10531
Location: Suffolk, UK

PostPosted: Sun Apr 18, 2010 7:23 pm    Post subject: Reply with quote

It probably should be http://science.nasa.gov/realtime/jtrack/3d/JTrack3D.html

Without the last "forward slash". Wink
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johnbull
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Joined: Jun 29, 2005
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PostPosted: Sun Apr 18, 2010 8:36 pm    Post subject: Reply with quote

Very informative many thanks
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mcrosser
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Joined: Apr 11, 2011
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PostPosted: Mon Apr 11, 2011 7:27 pm    Post subject: Thank you very much for your article! Reply with quote

Very informative and time-saving!
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ivokiss
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Joined: Jun 26, 2011
Posts: 1
Location: Sofia, Bulgaria

PostPosted: Sun Jun 26, 2011 11:09 am    Post subject: Correction and Thanks Reply with quote

Hello,
Thank you for making and maintaining such a good info resource.

In the introduction article How does the Global Positioning System work ?
http://www.pocketgpsworld.com/howgpsworks.php
Part The Satellite Network, third paragraph
"traveling at near 2,000mph" probably should be "20 000" mph ?

I'm new to satnav sphere but am interested and will learn. So your site is very helpful.
Thaks for your good work.

Ivo Kisselov
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Darren
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Joined: 11/07/2002 14:36:40
Posts: 23844
Location: Hampshire, UK

PostPosted: Sun Jun 26, 2011 12:36 pm    Post subject: Reply with quote

Actually we're both wrong. A more accurate speed would be about 3.9km/s or a little over 8,000mph.

I've corrected the original article.
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Javidkhan
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Joined: Oct 07, 2013
Posts: 1

PostPosted: Mon Oct 07, 2013 5:14 pm    Post subject: Reply with quote

The Global Positioning System (GPS) is actually a constellation of 27 satellites orbiting the earth and five ground stations. Out of these 27 satellites 24 are in operation and 3 are meant for backup purpose (in case of failure).The ground stations are responsible for keeping the satellites in precise orbit. Each of these satellites weighs about 3,000 to 4,000 pound and they are placed 12,000 miles above us making two complete rotations in less than 24 hours.

Source: http://thesecretsofscience.com/technology/how-gps-works
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