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LIDAR (LIght Detection And Ranging) technology can be used on autonomous agricultural vehicles for guidance and obstacle detection purposes. However, the quality of LIDAR measurements can be affected by mechanical vibrations induced by the operation of these vehicles on uneven terrain. The objective of this study was to develop a stabilizing system and to evaluate its effectiveness at reducing the transmission of mechanical vibrations to a LIDAR sensor installed on an agricultural tractor for the purpose of reducing the positioning error of obstacles during field operation. Special support bars (S) and stabilization system (SS) were designed for a SICK LMS 291-S14 LIDAR sensor mounted on an agricultural tractor. The positioning error of the sensor was assessed in field experiments by determining the difference between the known location of obstacles and their corresponding estimated locations from the sensor measurements. Increasing tractor speed had a negative effect on the accuracy of the sensor with an increase in the positioning error of up to 27%. The addition of the S system positively affected the accuracy of the sensor and resulted in a 41% decrease of the average positioning error from 340 to 201 mm. Finally, the addition of the SS system decreased the average positioning error by 57% from 382 to 161 mm.

Isolation of Vibrations Transmitted to a LIDAR Sensor Mounted on an Agricultural Vehicle to Improve Obstacle Detection.