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NMPC-based visual path following control with variable perception horizon

Published online by Cambridge University Press:  02 May 2023

Tiago T. Ribeiro*
Affiliation:
LaR - Robotics Laboratory, Department of Electrical and Computer Engineering, Federal University of Bahia, Salvador, Bahia, Brazil
Iago José P. B. Franco
Affiliation:
LaR - Robotics Laboratory, Department of Electrical and Computer Engineering, Federal University of Bahia, Salvador, Bahia, Brazil
André Gustavo S. Conceição
Affiliation:
LaR - Robotics Laboratory, Department of Electrical and Computer Engineering, Federal University of Bahia, Salvador, Bahia, Brazil
*
Corresponding author: Tiago Ribeiro; Email: tiagotr@ufba.br

Abstract

For greater autonomy of visual control-based solutions, especially applied to mobile robots, it is necessary to consider the existence of unevenness in the navigation surface, an intrinsic characteristic of several real applications. In general, depth information is essential for navigating three-dimensional environments and for the consistent parameter calibration of the visual models. This work proposes a new solution, including depth information in the visual path-following (VPF) problem, which allows the variation of the perception horizon at runtime while forcing the coupling between optical and geometric quantities. A new NMPC (nonlinear model predictive control) framework considering the addition of a new input to an original solution for the constrained VPF-NMPC allows the maintenance of low computational complexity. Experimental results in an outdoor environment with a medium-sized commercial robot demonstrate the correctness of the proposal.

Information

Type
Research Article
Copyright
© The Author(s), 2023. Published by Cambridge University Press

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