How GPS calculate it's position in 3D dimension?

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GPS is a free satellite based navigational system made by 24 satellites. It's own by U.S department of defense. GPS receiver passively receive signal from this satellite. When the GPS receiver receive 4 satellite signal, there can calculate it's position in 3D dimension.


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The GPS need the following information to calculate it's position.



  1. The location of a minimum of three satellites that lock in with the object to be located or tracked.


  2. The distance between the object and each of these satellites.

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