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When making measurements required in the configuration files, measurements should be made between the
point of interest and the measurement origin shown in Figure 10.
Figure 10. IMU measurement origin
OxTS NED navigation frame
The OxTS navigation frame is attached to the vehicle but does not rotate with it. The down axis is
always aligned to the gravity vector and north always points north.
Table 16. OxTS NED navigation frame definition
North
The north axis (N) is perpendicular to the gravity vector and in the direction of
the North Pole along the earth’s surface
East
The east axis (E) is perpendicular to gravity, perpendicular to the north axis and
is in the east direction
Down The down axis (D) is along the gravity vector
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