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Chapter 4 SMART7 with SPAN Operation
SMART7 Installation and Operation User Manual v6
60
4.2.2 The IMU Body Frame
The definition of the IMU Body frame is given by the physical axes of the IMU and represents how the sensors
are mounted inside the IMU. Refer to
SMART7 Mechanical Specifications
on page 136 for illustrations of the
IMU Body frame axes.
The origin of this frame is not the enclosure center, but the center of navigation (sensor center).
4.2.3 The Vehicle Frame
The definition of the vehicle frame is as follows:
l
z-axis – points up through the roof of the vehicle perpendicular to the ground
l
y-axis – points out the front of the vehicle in the direction of travel
l
x-axis – completes the right-handed system (out the right-hand side of the vehicle when facing forward)
Figure 18: Vehicle Frame
4.2.4 The User Output Frame
The user output frame is an arbitrary frame, which can be optionally defined to transfer inertial output to a more
useful position or reference frame.
By default, SPAN position and velocity output is given at the center of navigation of the IMU. To output position
and velocity at a different location, specify a user offset translation using the
SETINSTRANSLATION
com-
mand.
By default, SPAN attitude output is the rotation from the Local-Level frame to the Vehicle frame. If attitude output
is desired relative to another frame, specify a user offset rotation using the
SETINSROTATION
command.