- The ground station uses the doppler effect to find out where the satellite is in space
- The satellite itself can only pinpoint its location roughly because it doesn't bring up the necessary instruments, since that would be extra weight
- The ground station sends the satellite its exact location, which the satellite uses to calculate when it should perform certain operations such as starting an experiment or adjusting its attitude (the direction in which the satellite is pointing)
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Last updated on: 8 August 1997.