FENDT varioguide, Operator'S Manual

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3.1.3 Signal interruption
Position determination takes a certain amount of time after activation before reaching the specified level of
accuracy. Temporary obstruction may cause the system to lose its connection to the satellite signal. This
may result in reduced levels of accuracy, the need to redetermine position, or failures depending on the
system.
3.1.4 Static and dynamic accuracy (satellite drift)
Satellite drift
A certain amount of drift occurs on satellite-based navigation systems. The accuracy is therefore defined
statistically and specified as a percentage of the operational period.
•
Static accuracy
: Measured position of the stationary tractor over 1–3 days. The average value
determined states how close the measured value comes to the actual position.
•
Dynamic accuracy
: Pass-to-pass accuracy from way line to way line, which must be achieved when
crossing the field within 15 minutes. If a longer period of time passes between two passes, a certain
amount of drift will be noticeable.
3.1.5 Convergence time
The convergence time is the time required by the system after activation to determine the position of the
tractor. Satellite-supported correction signals require a certain amount of time after activation before they
reach the specified level of accuracy. Signal interruptions, e.g. due to obstacles such as buildings or trees,
delay this process. After an extended interruption in the correction signal, the system loses the level of
accuracy already achieved and starts the signal setup again from the beginning.
3.1.6 Conditions of use and application possibilities
Operating conditions
Ideal for satellite signal reception:
• The tractor is located on level ground or the base station is perfectly horizontal.
• Signal reception is not obstructed.
Possible applications for the system
• Guidance along parallel waylines in straight lines, bends and circular paths
• Road speed 0.1 km/h to 25 km/h forwards and reverse
• Parallel moving of the waylines (wayline offset) to the left and right to balance drift out, set
automatically or manually.
• Offset of the center line of the processed area to the center of the tractor, manually adjustable, required
for asymmetrical implements, e.g. mower combinations
• Saving of fields with waylines, obstacles and mapped areas
• Saving of the implement settings
• Display unit showing current wayline number
• Mapping the processed area
• Supply of multiple tractors via one base station
3.1.7 Restrictions
• Potential loss of GNSS signal due to obstructions near copses, trees and buildings.
• Potential loss of correction signal due to obstructions near copses, trees and buildings.
• Electromagnetic interference, e.g. from overhead lines.
3. VarioGuide definitions and specifications
VarioGuide 23
438.020.070.012