How do space shuttles measure their speed?

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Des

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How do space shuttles measure their speed?
« on: 23/03/2010 22:30:02 »
Des asked the Naked Scientists:
   
Hi, do space shuttles have speedometers that work in space? If so how do they gauge their speed?

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What do you think?
« Last Edit: 23/03/2010 22:30:02 by _system »

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Offline LeeE

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How do space shuttles measure their speed?
« Reply #1 on: 24/03/2010 09:44:07 »
I think that radar would be the simplest solution.
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Offline Soul Surfer

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How do space shuttles measure their speed?
« Reply #2 on: 24/03/2010 09:58:20 »
There are several ways  A variant of GPS is probably the most accurate.  I say a variant because normal GPS does assume that you are reasonably close to the surface of the earth space shuttles do go a few hundred miles up and this may require more calculation.
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