With a precise ephemeris available for the satellite, the geocentric position and ellipsoidal height of the satellite are available for any given observation time.
2.
The global network enabled the calculation of a " geodetic date " ( the geocentric position of the measurement system ) on different continents, within a few meters.
3.
It is the most accurate technique currently available to determine the geocentric position of an Earth satellite, allowing for the precise calibration of radar altimeters and separation of long-term instrumentation drift from secular changes in ocean topography.
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