GPS SHIFT: The U.S. Air Force is shifting the orbit of three of its Global Positioning System (GPS) satellites to improve worldwide coverage and assist soldiers in areas such as Afghanistan, where the rugged terrain can block signals and reduce accuracy. Previously organized around 24 slots in six orbital planes in medium Earth orbit, the constellation is being adjusted to provide positions for 27 satellites. The shift is using only spacecraft that are already in orbit, and should not affect ...
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