Engineering Principles of Agricultural Machines 2nd Edition

Chapter 6
Precision agriculture_________________________________123
Introduction................................................................................................................ 123
6.1 
Sensors.............................................................................................................. 124
6.1.1 
Sensor types.............................................................................................. 124
6.1.2 
Sensor applications...................................................................................124
6.1.3 
Advanced sensors......................................................................................124
6.2 
Global Positioning System.............................................................................. 125
6.2.1 
GPS for civilian u s e ................................................................................. 125
6.2.2 
Military G PS............................................................................................. 125

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6.2.3 
Differential GPS........................................................................................125
6.2.4 
Carrier-phase G P S ....................................................................................126
6.2.5 
Real-time kinematic GPS.........................................................................126
6.2.6 
Accuracy m easures.................................................................................. 126
6.2.7 
Coordinate transformation.......................................................................127
6.3 
Geographic Information System .................................................................... 130
6.3.1 
Data input to a F IS ....................................................................................130
6.3.2 
Map coordination......................................................................................131
6.3.3 
Data analysis in the F IS ...........................................................................133
6.3.4 
Data persistence........................................................................................133
6.4 
Variable Rate Applications............................................................................. 133
6.4.1 
Approaches............................................................................................... 133
6.4.2 
Applications.............................................................................................. 134
6.4.3 
Application resolution.............................................................................. 134
6.4.4 
Control systems.........................................................................................134
6.4.5 
Automatic guidance................................................................................. 135
6. 5 
Controller Area Networks............................................................................... 135
Problems......................................................................................................................137