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 Here's how GPS works in five logical steps:
- The basis of GPS is "triangulation" from
satellites.
- To "triangulate," a GPS receiver measures distance using the travel time of
radio signals.
- To measure travel time, GPS needs very accurate timing which it achieves with some
tricks.
- Along with distance, you need to know exactly where the satellites are in space. High
orbits and careful monitoring are the secret.
- Finally you must correct for any delays the signal experiences as it travels through the
atmosphere.
We'll explain each of these points in the next five sections of the tutorial. We
recommend you follow the tutorial in order. Remember, science is a step-by-step
discipline!
On to the Next Section |
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