Chapter 4 SPAN Operation
CPT7 and CPT7700 Installation and Operation User Manual v12
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installation can cause the IMU Body frame to be slightly out of alignment with the Vehicle frame. The
misalignment of the IMU Body frame from the Vehicle frame will add a bias to the SPAN solution.
The following diagrams show examples of a CPT7 installed in a vehicle with misalignment issues.
Figure 25: Rear View of CPT7 – Mounting Plate is not Flat
Figure 26: Side View of CPT7 – Vehicle is not Level
Figure 27: Top View of CPT7 – CPT7 Misalignment
The misalignments shown in the previous figures have been exaggerated for illustration purposes.
In a typical SPAN system installation, the slight misalignments shown in the examples above are hard to
detect and difficult to measure. For this reason, it is recommended that a Body to Vehicle Frame rotation
calibration routine be used so the SPAN system can determine and compensate for these angles. Refer to