Discuss: GPS - Where in the World Are We?

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Offline thedoc

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Discuss: GPS - Where in the World Are We?
« on: 04/05/2010 19:49:34 »
Where in the world am I?  We're looking at the science of the Global  Positioning System, or GPS, this week.  We find out how satellites can  tell you your location, as well as communicate with the bossy little box  that tells you which way to drive.  We discover the potential for  "spoofing" GPS with a false location, and how this might be the future  of cyber-terrorism as well as explore the cosmic reference frame that  the satellites themselves rely on.  In Kitchen Science, we get back to  basics and locate ourselves using a map and compass!  Plus, the first  amphibian genome helps to fill the vertebrate family tree, we meet the  colourful fish that shine a light on evolution and find out how a  technique developed to study eye disease can help find art forgeries.

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« Last Edit: 04/05/2010 19:49:34 by _system »


Offline SeanB

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Discuss: GPS - Where in the World Are We?
« Reply #1 on: 01/05/2010 16:17:19 »
Alternatives being LORAN and DECCA, still used in places around the world. Has advantages and disadvantages over GPS, but requires training to use. There is no " Idiot proof, just turn on and it works even for those who can't walk and chew gum at the same time" way to operate it, plus it needs you to have maps to show position ( most commonly on paper and for the area you are in) and plot your location.

Blocking GPS is easy, all you need is 30cm of concrete and the signal is buried so far beneath the noise that you cannot recover it, but spoofing needs a lot of sophisticated equipment to give the false information so that the receiver believes it.