Combine harvester control using Real-Time Kinematic GPS.

摘要

An accurate vehicle guidance systems is required for some precision agriculture operations. It can be used for high speed direct seeding on a farm tractor. Such a system also ensures neither overlapping nor missing areas during the harvest, even when visibility is poor. But, automatic path following in the field is a difficult problem. Many vehicle guidance systems have been studied. Some use two dimensional information, while others are based upon three dimensional information. Most of the sensorsuse output information relative to their environment without absolute reference of the path. As the new reference is based on the previous pass, one of the main problems encountered with the edge following systems is an increase in the amplitude of oscillations due to guidance errors in successive passes. Thus, human operators frequently and periodically sacrifice efficiency in one pass to straighten out the edge of the worked area. Another kind of sensor, centimeter accuracy Real-Time Kinematic basedGlobal Positioning System (GPS) receivers, can be used. The advent of accurate systems, with a standard deviation from the mean of ?0 mm, allows the design and implementation of absolute vehicle guidance systems. A few approaches to GPS-based control systems also include attitude measurement sensors such as fibre optic gyroscope. The preliminary work presented in this paper was aimed at validating the use of a GPS receiver in a vehicle guidance system, without any orientation sensor. We have designed acontroller to perform a line-following task. Real-time experiments have been carried out on a combine harvester.