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Launchpad: How GPS Works

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Uploaded by on Sep 3, 2008

In this NASA video segment a NASA expert explains the inner workings of the Global Positioning System (GPS). Learn more about trilateration and how four satellites work together to identify exact locations on Earth with the help of a two-dimensional model.

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Education

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  • Is there any limit on how many people can access a satellite?

    with GPS example?

  • @gordianknot555 Solar powered untill they go into eclips (in the earth's shadow), then they run off of batteries for a little while. When they come out of eclips, the solar arrays power the satalite, transmitter, and recharge the batteries.

  • so these satellites are constantly broadcasting a radio signal... are these satellites solar powered or how do they ensure that they won't run out of power?

  • such a shady character

  • @gtq838 based off this error caused by the time it requires for the radio signal to reach the receiver it is able to calculate the distance from the satellite and the quadralateration takes place. the gps is always able to pinpoint within centimeters but it required a special receiver that is encrypted and used only for military purposes.

  • @ebutuou123 yeah it was a really bad video... actually had false information. it does not use trilatiation... that would mean three satellites would be required it need four to determin your elivation. here is the real way it works.

    the satellites all have atomic clocks on them that broadcast the time... that is all they do. based on how far away the satellites are the time that it sent may take longer to reach the receiver and thus all will be off slightly. continued...

  • I'm in the market for a handheld, saw some good articles on gpssatnavreviews (.) com

  • this didnt explain anything

  • the gps device can't be touched once the car starts moving. The car user must come to a complete stop and place the park break on etc.

  • @ufoolme using gps while driving in australia is illegal? sounds stupid to me. also nasa wouldn't care anyways since 1 they don't operate, own, or controll gps. the air force does. 2 in america its not illegal.

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