Novatel GNSS Receiver and Antenna SMART-AG - Manual (Page 40)

40 SMART-AG User Manual Rev 5
Chapter 3 Operation
3.6 Tilt Compensation
The SMART-AG Tilt Compensation feature corrects for errors in position caused by tilting of the
vehicle. The SMART-AG senses the vehicle’s roll angle and, with the user-entered “height above
ground”, compensates the position output to give the position under the vehicle rather than at the
antenna.
As shown in Figure 10, if an agricultural implement is operating on sloped terrain, the position will be
in error by an amount proportional to the tilt angle.
Figure 10: SMART-AG Tilt Compensation
If tilt compensation is enabled, the SMART-AG determines the tilt and corrects the position data
before it is forwarded to the user equipment. In the above example, the tilt is 10 degrees, and the
position correction that needs to be applied is 62 cm.
The BESTPOS, BESTXYZ and all NMEA GPGGA logs will provide tilt-compensated position logs.
 Information about installation and setup can be found in:
• Chapter 2, Installation and Setup on page 20.
Information about tilt-compensation commands can be found in:
• Appendix B.5, $PMDT Configure Tilt Compensation starting on page 76
Level Ground
10 o slope
10 o
SMART-AG
3.5 m
Position Error
62 cm