Posted on 04/08/2012 7:06:52 PM PDT by ConservativeStatement
A fourth constraint can be supplied if you know your elevation above the Geoid. (Each equation supplying satellite location and time delay is a constraint.) I don’t know if you are familiar with Bankcroft’s method, but it is easily adaptable to knowledge of your distance from the center of the Geiod (earth), or have exact knowledge of time GPS time.
BTY, the more satellites (or other constraints, e.g., altimeter data) you have, the more accurate you estimate of position.
Why does the movie “Predator” come to mind?
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