Re: to sam

Tom Potter wrote:


2. "an airplane determines its current position and heading by comparing the time signals it receives from a number of the GPS satellites (usually 6 to 12) and
triangulating on the known positions of each satellite."

This is incorrect. The "triangulation" occurs on the airplane,
not on "the known positions of each satellite."


Let me help you out here, Potter. A GPS receiver determines its position
with respect to several GPS satellites by a process call trilateration.
Here's an example calculation.

http://www.colorado.edu/geography/gcraft/notes/gps/gps_f.html
http://www.colorado.edu/geography/gcraft/notes/gps/gif/navigate.gif

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