資料來源 : WordNet®

Global Positioning System
     n : a navigational system involving satellites and computers
         that can determine the latitude and longitude of a
         receiver on Earth by computing the time difference for
         signals from different satellites to reach the receiver
         [syn: {GPS}]

資料來源 : Free On-Line Dictionary of Computing

Global Positioning System
     
         (GPS) A system for determining postion on the
        Earth's surface by comparing radio signals from several
        satellites.  When completed the system will consist of 24
        satellites equipped with radio transmitters and atomic clocks.
     
        Depending on your geographic location, the GPS receiver
        samples data from up to six satellites, it then calculates the
        time taken for each satellite signal to reach the GPS
        receiver, and from the difference in time of reception,
        determines your location.
     
        ["Global Positioning by Satellite"?  Precison?  Coverage?  Web
        page?]
     
        (1998-02-10)