Travis Marlatte wrote:
"Mxsmanic" wrote in message
...
It does indeed measure angles, rest assured. Of course, it does a lot
more than that.

It is complex. But it's not triangulation.

"GPS receivers use triangulation of the GPS satellites' navigational
signals to determine their location."
http://msl.jpl.nasa.gov/Programs/gps.html

A GPSr does not measure angles, it measures timing and ranging, as in
"NAVSTAR" (NAVigation Signal Timing And Ranging).

"In addition to knowing the distance to a satellite, a receiver needs
to know the satellite's exact position in space; this is known as its
ephemeris. Each satellite's signal transmits ephemeris information
about its exact orbital location. The GPS receiver uses this
information to precisely establish the position of the satellite."
http://www.lerc.nasa.gov/WWW/MAEL/ag/gps.htm
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- gpsman