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CALIBRATION OF A NON-CONTACT OPTICAL VELOCITY SENSOR FOR A PRECISION FARMING APPLICATION

calibration ABSTRACT: This paper shows the possibility of use geodetic multi sensor systems in the area of precision farming, particularly with regard to the position-controlled deposition of seed. The intention of this project is the generation of longitudinal as well as diagonal lines in order to allow a mechanical hoeing between single plants in rectangular. In order to achieve the dynamics of the process under agricultural conditions a combination of sensors, supplemented by the utilisation of the physical inertia of the machine in the form of a movement model (KALMAN-filtering), is being used for solving the problem. By using a multi sensor system for position-controlled deposition a precision range measurement by a distance or velocity sensor is of importance. For verification of the manufacturers' instructions of the implemented Non-Contact Optical Velocity Sensor on agricultural conditions a number of practical examinations have been carried out. Apart from a comparison with measurement data of a Leica Laser-Tracker on laboratory conditions other examinations have been carried out with RTK-GPS for larger distances under conditions of chronological synchronism. The RTK-GPS comparison measurements have taken place above asphalt as well as above prepared farmland. The findings can serve the calibration of the multi sensor system and make the design of the KALMAN filtering for a precise positioning in real-time possible.