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EuroPak-15a Receiver User Manual Rev 5 57
Figure 4: The WGS84 ECEF Coordinate System
ω
Z
WGS 84
BIH - Defined CTP
(1984.0)
Earth's Center
of Mass
Y
WGS 84
BIH-Defined
Zero Meridian
(1984.0)
X
WGS 84
Origin = Earth's center of mass
Z-Axis =
X-Axis =
Y-Axis =
Parallel to the direction of the Conventional Terrestrial
Pole
(CTP) for
polar motion, as defined by the Bureau International
de
l'Heure (BIH) on
the basis of the coordinates adopted for the BIH
stations.
Intersection of the WGS 84 Reference Meridian
Plane
and
the plane of
the CTP's Equator, the Reference Meridian being
parallel
to
the Zero
Meridian defined by the BIH on the basis of the
coordinates adopted for
the BIH stations.
Completes a right-handed, earth-centered, earth-
f
i
x
ed
(ECEF)
orthogonal coordinate system, measured in the
plane
o
f
the
CTP
Equator, 90 East of the X-Axis.
*
Analogous to the BIH Defined Conventional Terrestrial System (CTS), or BTS,
1984.0.
- Definitions -
*