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Improved localization in a corn crop row using a rotated laser rangefinder for three-dimensional data acquisition

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Abstract

Small robotic vehicles have been navigating agricultural fields in the pursuit of new possibilities to increase agricultural production and to meet the increasing food and energetic demands. However, a perception system with reliable awareness of the surroundings remains a challenge to achieve autonomous navigation. Camera and single-layer laser scanners have been the primary sources of information, yet the first suffers from outdoor light sensibility and both from occlusion by leaves. This paper describes a three-dimensional system acquisition for corn crops. The sensing core is a single-layer UTM30-LX laser scanner rotating around its axis, while an inertial sensor provides angular measurements. With the rotation, multiple layers are used to compose a 3D point cloud, which is represented by a two-dimensional occupancy grid. Each cell is filled according to the number of readings, and their weights derive from two procedures: firstly, a mask enhances vertical entities (stalks); secondly, two Gaussian functions on the expected position of the immediate neighboring rows weaken readings in the middle of the lane and farther rows. The resulting occupancy grid allows the representation of the cornrows by virtual walls, which are used as references to a wall follower algorithm. According to experimental results, the virtual walls are segmented with reduced influence from straying leaves and sparse weeds when compared to the segmentation done with single-layer laser scanner data. Indeed, 64.02% of 3D outputs are within 0.05 m limit error from expected lane width, while only 11.63% of single-layer laser data are within same limit.

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Acknowledgements

The authors would like to thank São Paulo Research Foundation (FAPESP) grant #2017/10401-3 and #2016/09970-0, EMBRAPA and EESC-USP, for their support in this work. This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001.

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Authors and Affiliations

  1. Mechanical Engineering Department, University of São Paulo, São Carlos, SP, Brazil

    Vitor A. H. Higuti & Marcelo Becker

  2. Agricultural and Biological Engineering Department, University of Illinois at Urbana-Champaign, Champaign, IL, United States

    Mateus V. Gasparino & Andrés E. B. Velasquez

Authors
  1. Mateus V. Gasparino
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  2. Vitor A. H. Higuti
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  3. Andrés E. B. Velasquez
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  4. Marcelo Becker
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Correspondence to Mateus V. Gasparino.

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Technical Editor: Victor Juliano De Negri.

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Gasparino, M.V., Higuti, V.A.H., Velasquez, A.E.B. et al. Improved localization in a corn crop row using a rotated laser rangefinder for three-dimensional data acquisition. J Braz. Soc. Mech. Sci. Eng. 42, 592 (2020). https://doi.org/10.1007/s40430-020-02673-z

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  • DOI: https://doi.org/10.1007/s40430-020-02673-z

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