SATCOM

• Atomic Clocks are used in various space applications: examples are GNSS and SATCOM Satellites
  GNSS (navigation) systems such as GPS, Galileo and Glonass uses atomic clocks as the key component to provide the accurate timing needed for the navigation process.
  A communication satellite (sometimes referred to in short as ComSat) is a satellite stationed in space for the purposes of telecommunications. Modern communications satellites use geostationary orbits, Molniya orbits or low polar Earth orbits.
  A satellite communication system is built up from two main sub systems: the satellite and the satellite base stations.
  Atomic clocks on board and in the base station are essential for precise timing.
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