GPS CNAV Earth Orientation Parameters Message (RINEX v4)

R2026b

Earth orientation parameters provide corrections related to the Earth’s rotation and orientation that are required for precise positioning computations.

This Earth orientation parameters message is returned by the rinexread function as a timetable stored in the field data.GPS.CNAV.EOP. Each row of the timetable corresponds to a transmitted Earth orientation parameters message.

For a high-level overview of the available GPS navigation message types and their organization in RINEX version 4, see GPS Navigation Data (RINEX v4).

Field	Data Type	Description
Time	datetime	GPS clock time
SatelliteID	double	Satellite system (G) number (PRN)
Xp	double	X‑component of polar motion (arc-sec)
dXpdt	double	First derivative of the X‑component of polar motion with respect to time (arc-sec/day)
d2Xpdt2	double	Second derivative of the X‑component of polar motion with respect to time (arc-sec/day^2)
EOPMessage1Spare1	double	Spare parameter reserved for future use
Yp	double	Y‑component of polar motion (arc-sec)
dYpdt	double	First derivative of the Y‑component of polar motion with respect to time (arc-sec/day)
d2Ypdt2	double	Second derivative of the Y‑component of polar motion with respect to time (arc-sec/day^2)
TransmissionTime	double	Transmission time of the message (seconds of the GPS week)
DeltaUT1	double	Difference between UT1 and UTC (s)
dDeltaUT1dt	double	First derivative of UT1–UTC with respect to time (s/day)
d2DeltaUT1dt2	double	Second derivative of UT1–UTC with respect to time (s/day^2)