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An Algorithm to Reduce DGPS Error for Agricultural
Vehicle Guidance
Eliminating the selective availability (SA) error by
the Department of Defense and availability of Wide Area
Augmentation System (WAAS) signal as a free source of
differential correction have resulted in improving the
accuracy of low cost GPS receivers. One approach to
reduce the cost of automatic guidance system is to use
a combination of several low cost GPS receivers along
with a collection of some other sensors such as odometers,
gyroscopes, sonar sensors, and cameras. Also, an appropriate
mathematical technique is needed to combine all these
data together. In this paper, we investigated the possibility
of combining data from several DGPS receivers to come
up with a low cost DGPS that has accuracy level to that
obtained from commercially available high-cost DGPS
receivers. Several configurations of DGPS receivers
were studied and compared through static and dynamic
tests.
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Investigators: Reza Ehsani, Lixin Lang, and Erdal Ozkan,
Department of Food, Agricultural and Biological Engineering.
Contact: Reza Ehsani
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