IHI Robust Path Planning against Position Error for UGVs in Rough Terrain Yuki DOI, Yonghoon JI, Yusuke TAMURA(University of Tokyo), Yuki IKEDA, Atsus

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1 IHI Robust Path Planning against Position Error for UGVs in Rough Terrain Yuki DOI, Yonghoon JI, Yusuke TAMURA(University of Tokyo), Yuki IKEDA, Atsushi UMEMURA, Yoshiharu KANESHIMA, Hiroki MURAKAMI(IHI Corporation), Atsushi YAMASHITA, and Hajime ASAMA(University of Tokyo) Abstract : We propose a novel path planning method considering errors for off-load UGVs (unmanned ground vehicles) based on 3D terrain map information. Previous studies on path planning of the UGV traveling on rough terrain did not manage position uncertainties caused by GPS and control velocities. The proposed method enables UGVs to generate the robust path in the large-scale terrain map. 1. DARPA 1) 2) GPS Galileo GNSS Berg 3)

2 Fig. 2: Concept of random sampling: (a) validity check of nodes and (b) path generation. 2.3 Fig. 1: Flowchart of proposed path planning method GNSS 2 2) GNSS 2 2 LiDAR 2.2 Fig.1 2) Fig.2 FCL a Flexible Collision Library 4) FCL PDST Path-Directed Subdivision Trees 5) 2.4 2) Σ χ 2 EKF 6) GNSS

3 Σ xt EKF Fig. 3: Transitions of ellipsoids under different GNSS conditions. x = (x, y, ψ) T u = (v, ω) T f x t 1 + v t t cos ( ) ψ t 1 + ωt t 2 x t = f(t) = y t 1 + v t t sin ( ψ t 1 + ωt t ) 2. (1) ψ t 1 + ω t t J x J u Fig. 4: Changes of ellipsoids by EKF: (a) predict step and (b) update step. EKF EKF 3, 7) EKF 3 EKF Fig.3 GNSS GNSS 2.5 EKF Fig.4 EKF Σ xt 1 Σ xt Σ xt GNSS J x = f x, (2) J x = f u, (3) EKF Σ ut Σ xt Σ xt = J xt Σ xt 1 (J xt ) T + J ut Σ ut (J ut ) T. (4) Σ xt EKF EKF GNSS Q H H GNSS Σ xt S t = H t Σ xt (H t ) T + Q t, (5) K t = Σ xt (H t ) T (S t ) 1, (6) Σ xt = (I K t H t ) Σ xt. (7) Σ xt

4 Fig. 5: Simulation environments: (a) map 1 and (b) map ) Intel corei GHz RAM16.0GB Fig m 200 m m 100 m m 16 m 2 7 m 30 m GNSS EKF 2 2 GNSS x y 1.0 m 1.0 deg 95 % Fig.6 1 2) 5 Fig. 6: Generated paths through five repeated experiments on map 1: (a) results of previous research 2) and (b) results of proposed method. Fig.7 3 Fig Fig GNSS EKF

5 Fig. 7: Generated path depicted with error ellipsoids on map 1. Fig. 8: UGV s translational velocity on generated path. Fig.10 Fig. 9: Difference of generated paths depending on error parameters of UGV s movement on map 2: (a) result for small error value and (b) result for large error value GNSS ImPACT 1) DARPA Grand Challenge, mil/grandchallenge/ 2),,,,,,,,, 3, 22, pp , ) Van Den Berg J., Abbeel P. and Goldberg K., LQG- MP: Optimized Path Planning for Robots with Motion Uncertainty and Imperfect State Information, the International Journal of Robotics Research, Vol. 30, Issue 7, pp , 2011.

6 Fig. 10: Difference of generated nodes depending on error parameters of UGV s movement on map 2: (a) result for small error value and (b) result for large error value. 4) FCL: A Flexible Collision Library, http: //gamma.cs.unc.edu/fcl/fcl_docs/webpage/ generated/index.html 5) Ladd A. M. and Kavraki L. E., Fast Tree-based Exploration of State Space for Robots with Dynamics, Algorithmic Foundations of Robotics VI, Springer Berlin Heidelberg, pp , ) Greg W. and Gary B., An Introduction to the Kalman Filter, Proceedings of ACM SIGGRAPH, Course 8, ) Pepy R. and Lambert A., Safe Path Planning in an Uncertain-configuration Space Using RRT, Proceedings of the 2006 IEEE/RSJ International Conference on Intelligent Robots and Systems, pp , 2006.

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