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S
X
0
P
Y
0
Z
0
®
±
®
±
unit sphere
earth
X
0
Y
0
Z
0
||X
0
||Y
0
||Z
0
®
±
S
P
YY
SP
–
XX
SP
–
ZZ
SP
–
00
0
0
00
P
X
0
Y
0
ZZ=
0
X
Y
X
0
Y
0
X
Y
Y
0
Y
X
0
X
ZZ=
0
q
0
q
0
geoid
ellipsoid
N
instantaneous
h
DH
sea surface
SST
a
mean sea surface
satellite orbit
3D accelerometer
GPS satellites
earth's surface
LEO satellite
3D accelerometers
GPS satellites
earth's surface
LEO satellites
gradiometer
GPS satellites
earth's surface
LEO satellite
V
x1
V
x2
Dz
x
z