Science Blog ZINC PROJECTS
Checking global navigation satellite system accuracy
Date: 04-Jan-08
Author: U.S. National Oceanic and Atmospheric Administration
NOAA will lead an international effort to pinpoint the locations of more than 40 global positioning satellites in Earth orbit, which is vital to ensuring the accuracy of GPS data that millions worldwide rely upon everyday for safe navigation and commerce.
The Global Navigation Satellite Systems, which include the U.S.-based Global Positioning System, the Russian GLONASS system, and the upcoming European Galileo system, are used for accurately determining the geographic position of any point on Earth.
 The U.S. NAVSTAR Global Positioning System is a constellation of a minimum of 24 navigational satellites that orbit Earth in six orbital planes. Radio signals from at least three GPS satellites provide precise geographic location of a target on or near the Earth's surface. Courtesy: Canada Centre for Remote Sensing
Full story: NOAA to Ensure Global Navigation Satellite System Accuracy
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