Chapter 3

SPAN-CPT Operation

 

 

3.1.3Enclosure Frame

The definition of the enclosure frame is defined on the SPAN-CPT and represents how the sensors are mounted in the enclosure. If the SPAN-CPT is mounted with the z-axis (as marked on the SPAN-CPT) pointing up, the enclosure frame is the same as the SPAN frame.

The origin of this frame is not the enclosure center, but the Center of Navigation (sensor center).

Figure 9: SPAN-CPT Center of Navigation

+X

+Y

+Z

+X

 

 

 

 

 

Center of Navigation indicators

 

 

 

 

 

 

 

 

 

 

 

 

 

Although the SPAN-CPT is a rugged product, the gyros inside are sensitive and can be

 

 

damaged by environmental shocks such as vibration, bumps and rapid temperature

 

 

 

changes.

 

 

 

 

 

 

3.1.4

 

Vehicle Frame

The definition of the vehicle frame is as follows:

z-axis points up through the roof of the vehicle perpendicular to the ground

y-axis points out the front of the vehicle in the direction of travel

x-axis completes the right-handed system (out the right-hand side of the vehicle when facing forward)

Use the VEHICLEBODYROTATION command to enter the rotation into the system and use the RVBCALIBRATE command to calculate this rotation. See the SPAN on OEM6 Firmware Reference Manual (OM-20000144) for information about these commands.

Figure 10: Vehicle Frame

Z

Y

X

22

SPAN-CPT User Manual Rev 8

Page 22
Image 22
Novatel OM-20000122 user manual Enclosure Frame, Vehicle Frame