Wireless Industry Dictionary is a free tool to get technical definitions and lookup industry terms from more than 11,000 terms, acronyms, and definitions.
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GPS Quick Course Book
Global Positioning System - GPS Book
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Low Earth Orbit (LEO) Low Earth Orbit (LEO)
A satellite system where the satellites are located approximately 500-1,000 miles above the Earth. LEO systems typically provide mobile satellite services (MSS) to handheld or mobile satellite telephones.
Low Earth Orbit (LEO) Low Earth Orbit (LEO) Operation
Low Earth Orbit - LEO Satellite Operation Diagram

This figure shows an LEO satellite system. In this diagram, a portable satellite telephone is communicating with a landline telephone. The satellite telephone communicates with the closest LEO satellite. Because LEO satellites fly very close to the surface of the earth, they go across the visible horizon in approximately 10 minutes in reference to a mobile satellite customer's location. When the first satellite moves out to the horizon, another LEO satellite becomes available to continue the call. However, robust network communications need to be in place to maintain calls (especially data transmission) within this period. Some systems will use satellite diversity to allow talking through more than one satellite at a time, avoiding call "dropouts" from signal blockage.
alt GPS Quick Course, 2nd Edition Books
Global Positioning System - GPS Book
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 GPS Quick Course Book
This book covers satellite position location technology and the GPS system has evolved. You will learn the functional parts of GPS systems, how they work and work together to provide position measurements that are accurate to within centimeters.

$19.99 Printed, $16.99 eBook
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