Leica Geosystems GPS Basics - Manual (Page 25)

25
GPS Basics -1.0.0en How GPS works
4
5
6
3.
4.
5.
6.
a second set of
wavefronts or phase
lines are created.
The point must lie
on one of the
intersections of the
two sets of phase
lines.
Adding a third
satellite further
narrows the number
of possibilities. The
point must be on an
intersection of all
three phase lines.
Adding a fourth
satellite further
narrows the
number of
possibilities.
As the satellite
constellation
changes it will
tend to rotate
around one point,
revealing the
most probable
solution.