ATIS Telecom Glossary
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ephemeris
A electronic or hard-copy table or listing of the predicted positions of astronomical bodies such as the planets or the Moon; and by extension, the predicted positions of artificial satellites, such as communications satellites, orbiting the Earth. Plural ephemerides. Note 1: Ephemerides are essential tools for accurate aiming of movable high-gain antennas at, e.g., communications satellites, especially ones that exhibit significant movement relative to a fixed position on the Earth. Note 2: Precise ephemerides of the satellites used in global navigation systems, such as GPS, are required for the proper functioning of these systems. [FAA]

 

 

 

 

 

 

 

 

 

 



 
These definitions were prepared by ATIS Committee PRQC
 
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