OXTS RT1003, Руководство пользователя

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RT1003 Manual
Revision:
190628
19
ISO 8855 ENU earth-fixed system
Figure 5. ISO 8855 earth-fixed system
The ISO earth-fixed system is attached to the IMU frame origin but does not rotate with it. The north and east
axes are perpendicular to the gravity vector and north always points north.
The ISO 8855 earth-fixed system uses an earth-fixed, earth-centred reference frame, and
employs an ENU (east, north, up) orientation. It is shown in Figure 5. The east and north axes
are always perpendicular to the gravity vector. As long as the displaced output function in
NAVconfig is not enabled, the ISO 8855 earth-fixed system is centred to the IMU frame
origin.
Table 9. ISO 8855 earth-fixed system definition
Axis Description
East The east axis (E) is perpendicular to gravity, perpendicular to the north axis and is in the
east direction
North The north axis (N) is perpendicular to the gravity vector and in the direction of the north
pole along the earth's surface
Up The up axis (U) is co-axial with the gravity vector, and positive in the up direction