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TimeSource 3100 13
Description
097-72020-01 Issue 9: November 2003
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SSSSSSSSS SSS SSSS S SSSSS SSSSSSS S SSS SSSSS
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Global Positioning System
The United States Government developed the GPS navigation system. It is a satellite-based,
radio navigation aid designed to provide global, all-weather, precise navigation and timing
capability to users 24 hours a day.
The satellites, circling the earth at approximately 20.197 km, are arranged in 6 orbits with 4
operational satellites in each orbit. Each satellite has an orbital period of approximately 12
hours. This configuration assures that a minimum of 4 satellites, and as many as 12, are in
view anywhere in the world at all times.
The TimeSource 3100 tracks all satellites within its field of view. The performance of each
tracked satellite is observed and compared to the others, and available for use in the timing
solution. A satellite with unacceptable performance data is dropped from the timing
solution.
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