| GPS
PRECISE EPHEMERIS INFORMATION
The U.S. Department of Transportation's Civil GPS Service has designated
NOAA to be the federal agency responsible for providing accurate
and timely Global Positioning System (GPS) satellite ephemerides
("orbits") to the general public. The GPS precise orbits are derived
using 24 hour data segments from the global GPS network coordinated
by the International Geodynamics GPS Service (IGS). the reference
frame used in the computation is the International Earth Rotation
Service Terrestrial Reference Frame (ITRF). In addition, an informational
summary file is provided to document the computation and to convey
relevant information about the observed satellites, such as maneuvers
or maintenance. The NGS Precise orbits generally are available seven
days after the date of observation.
The following link will direct you to the National Geodetic Survey
website, where you can download the latest GPS Precise Ephemeris
data and much more.
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