Global locating system

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A Global Locating System (GLS) is any tracking system that operates via satellite around the world. It can be considered the obverse of the Global Positioning System in that GPS provides a global navigation (where am I?) capability and GLS provides a global tracking (where is it?) solution.

An early example of GLS is the Sarsat Search and Rescue satellite system. In GLS, a minimal set of positioning data (e.g. signal arrival time or frequency offset or Doppler data) is collected and relayed via a satellite link. Equipment installed in the satellite Ground station demodulates the data and computes the latitude and longitude of the remote transmitter.

GLS is in use by Skybitz, Cospas-Sarsat. and the Argos System.


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