SP3EphemerisFile Object

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The SP3Ephemeris file, also known as “Precise Ephemeris,” contains data records for the orbit and clock states for the entire GPS constellation. There are two versions of the format, Version A and Version C; FreeFlyer supports the reading and writing of both versions. The data records are nominally provided at 15 minute intervals, the time system of the file is GPS time, and the reference frame for the orbit data is Earth-Centered-Earth-Fixed (ECEF). FreeFlyer automatically converts between ECEF and MJ2000 when reading and writing SP3EphemerisFiles.


Inheritance Hierarchy: ObjectàSP3EphemerisFile


Available In Editions:



Timing Precision Mode

This page describes functionality in millisecond timing precision mode.


Deprecated Properties


See also

Orbit Determination Guide

SP3 Ephemeris Guide