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Relative position measurement system for vehicles using diffuse light from LEDs

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Pp. 230-238 in Automation Technology for Off-Road Equipment, Proceedings of the July 26-27, 2002 Conference (Chicago, Illinois, USA)  701P0502.(doi:10.13031/2013.10011)
Authors:   K. Imou, T. Sasaki, T. Okamoto, Y. Kaizu
Keywords:   Position detection, Infrared, Diffuse light, Transponder, Light emitting diodes

For the purpose of saving labor and improving safety in farm operations conducted with a pair of vehicles, automatic driving systems of the following or preceding vehicle have been studied. These systems require real-time and precise measurement of the relative position of vehicles. The authors propose a relative position detection system using diffuse light from LEDs. In the first stage of this study, a range-finder was developed and tested, consisting of two stations which emit high-frequency modulated light at each other. The range between the stations is obtained from the phase difference between the two low-frequency beat signals generated in both stations. Performance tests were conducted under direct sunshine, and the maximum and standard errors from the regression values were about 5 and 3 cm respectively in the range from 1 to 10 m.

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