Global Positioning System Reference
In-Depth Information
The
coordinate reference frame
for GPS is WGS 84. In fact, it is a realization
of an International Terrestrial Reference Frame. It is realized through Cartesian
coordinates and velocities of a global set of sites; these are identical to the tracking
stations for GPS. Occasionally, the tracking stations are recoordinated. The latest
modification was implemented in GPS week number 1150.
In a similar way, Galileo will use another independent realization (GTRF). In
practice, both frames will be the same, but the difference is still a few centimeters,
which may be significant for very precise applications.
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