Hey Doug. With only 2 satellites a GPS receiver will calculate 2 points on Earth. With 3, it will eliminate one but won't show altitude.Tathradj said:Or,
A GPS as we know uses triangulation in a 3d
environment to work out where it is.
One of those points is incorrect so a certain point
that is mathematically incorrect is removed.
Maybe they are using 3 or 4 types of signalling and
removing the spurious one that is not mathematically correct.
This is going to be interesting... :coffee: :coffee:
With 4 satellites, altitude will be calculated.
More satellites will improve positioning as they will provide better geometries (i.e.: two lines intersecting at low angles give more error than two lines crossing at high angles). The GPS will track all visible satellites and select the satellites giving the best receive power and geometry.