GPS
Using Global Positioning Systems
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Adventures in amplified GPS antenna construction; an experiment
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How GPS works
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The Global Positioning System (GPS) is a constellation of 24 satellites which is used for navigation and precise geodetic position measurements.
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Installation guidelines for static GPS Antennas
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GPS information and thorough product reviews
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GPS signal characteristics, system time, system segments, frequencies
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The Global Positioning System, a detailed looked at the miracle of modern navigation By Robert A. Nelson
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Differential Global Positioning Service (DGPS) is a land-based augmentation system that receives and processes signals from orbiting GPS satellites, calculates corrections from known positions and broadcasts these corrections via a Medium Frequency (MF) Transmitter to DGPS users in the Broadcast Site's coverage area.
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It is easy today to build a GPS tracking system for mobile applications that can be adapted to your needs. In fact, it is more accurate to speak of a GNSS (Global Navigation Satellite System) tracker, a term which encompasses the 4 positioning systems or satellite constellations.