Sensors 2011, 11(6), 5630-5644; doi:10.3390/s110605630
Article

A Simple Method to Improve Autonomous GPS Positioning for Tractors

Received: 14 April 2011; in revised form: 9 May 2011 / Accepted: 20 May 2011 / Published: 26 May 2011
(This article belongs to the Special Issue Sensors in Agriculture and Forestry)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: Error is always present in the GPS guidance of a tractor along a desired trajectory. One way to reduce GPS guidance error is by improving the tractor positioning. The most commonly used ways to do this are either by employing more precise GPS receivers and differential corrections or by employing GPS together with some other local positioning systems such as electronic compasses or Inertial Navigation Systems (INS). However, both are complex and expensive solutions. In contrast, this article presents a simple and low cost method to improve tractor positioning when only a GPS receiver is used as the positioning sensor. The method is based on placing the GPS receiver ahead of the tractor, and on applying kinematic laws of tractor movement, or a geometric approximation, to obtain the midpoint position and orientation of the tractor rear axle more precisely. This precision improvement is produced by the fusion of the GPS data with tractor kinematic control laws. Our results reveal that the proposed method effectively reduces the guidance GPS error along a straight trajectory.
Keywords: agricultural vehicles; control; Global Positioning System (GPS); guidance
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MDPI and ACS Style

Gomez-Gil, J.; Alonso-Garcia, S.; Gómez-Gil, F.J.; Stombaugh, T. A Simple Method to Improve Autonomous GPS Positioning for Tractors. Sensors 2011, 11, 5630-5644.

AMA Style

Gomez-Gil J, Alonso-Garcia S, Gómez-Gil FJ, Stombaugh T. A Simple Method to Improve Autonomous GPS Positioning for Tractors. Sensors. 2011; 11(6):5630-5644.

Chicago/Turabian Style

Gomez-Gil, Jaime; Alonso-Garcia, Sergio; Gómez-Gil, Francisco Javier; Stombaugh, Tim. 2011. "A Simple Method to Improve Autonomous GPS Positioning for Tractors." Sensors 11, no. 6: 5630-5644.

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