• The wave angle and thus reception of the
correction signal decreases as the vehicle
moves north.
• Hills can make the reception of satellite signals
weaker.
• The GNSS system does not offer uniform
availability around the clock and for every
location.
GUID-D096BA8E-C107-4C0B-80E8-A486E76B3E4F-high.jpg [High]
Fig. 6
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 machine 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 wayline to wayline, 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 necessary for the system to determine the position of the tractor after
you activate the system. It is necessary to give some time to the satellite-based correction signals to get
the correct level of accuracy. Signal interruptions, for example buildings, trees and other obstacles, make
this procedure slower. If there is an extended stop in the correction signal, the level of signal precision
decreases, and the system does the signal settings again.
3.1.6 Accuracy and strength indicator
NOTE:
Automatic wayline guidance can only be activated with the yellow bar displayed.
The accuracy of positioning is dependent upon the positions of the satellites relative to each other and the
position of the receiver, as well as the accuracy of time measurement and the runtime.
At favourable angles (~ 90°), the accuracy of measurement will be greater than at acute angles or angles of
approx. 180°.
HDOP
(Horizontal Dilution of Precision)
The HDOP value is a measure of measured value scatter; the lower the value, the lower the degree of
measurement error.
SV
GUID-C3AD2D91-8A28-435D-B8F6-51E37A491962 [V1]
GUID-7CF2F5A9-3FE9-4108-BE7E-4AC31003BED3 [V3]
GUID-039C1E61-42EB-4B16-9DFC-3E8B189569C4 [V1]
GUID-9F5E9435-E526-407D-8604-BCC4AB3332D0 [V2]
3. Signal definition and characteristics
Smart farming
25
39 924 21 5
Summary of Contents for Valtra Smart farming
Page 1: ...OPERATOR SMANUAL Smartfarming 39 924 21 5 01 2020 YOUR WORKING MACHINE...
Page 7: ...Table of contents 12 Smart farming 39 924 21 5...
Page 11: ...Table of contents 16 Smart farming 39 924 21 5...
Page 17: ...Table of contents 22 Smart farming 39 924 21 5...
Page 99: ...Table of contents 104 Smart farming 39 924 21 5...
Page 109: ...5 Section Control operation 114 Smart farming 39 924 21 5...
Page 111: ...Table of contents 116 Smart farming 39 924 21 5...
Page 125: ...Table of contents 130 Smart farming 39 924 21 5...
Page 131: ...Table of contents 136 Smart farming 39 924 21 5...
Page 137: ...Table of contents 142 Smart farming 39 924 21 5...
Page 141: ...Table of contents 146 Smart farming 39 924 21 5...
Page 153: ...10 Troubleshooting 158 Smart farming 39 924 21 5...
Page 155: ...Table of contents 160 Smart farming 39 924 21 5...
