GPS (Global Positioning Satellite)

Wireless Standard - GPS




This document is designed as a very brief introduction to the GPS satellite navigation system which utilizes standardized wireless communication. The link page points to additional websites where more information is available.


The Global Positioning System (GPS) is a U.S. space-based global navigation system composed of 24 to 32 satellites in medium earth orbit. GPS satellites broadcast signals from space that GPS receivers use to provide three-dimensional location (latitude, longitude, and altitude) plus precise time.


A GPS receiver calculates its position by precisely timing the signals sent by the GPS satellites high above the Earth. Each satellite continually transmits messages which include

1) the time the message was transmitted

2) precise orbital information (the ephemeris)

3) the general system health and rough orbits of all GPS satellites (the almanac).

The GPS receiver offered by WiHART Systems provides position information as well a pulse per second clock which is accurate to 300-600 nanoseconds for precision timing and synchronization.  The unit is ultra low power and it is suitable for battery powered portable operation.  It operates indoors and includes a built in antenna.  



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