State estimation for legged robots: Consistent fusion of leg kinematics and IMU

Michael Bloesch, Marco Hutter, Mark A. Hoepflinger, Stefan Leutenegger, Christian Gehring, C. David Remy, Roland Siegwart

Publikation: Beitrag in Buch/Bericht/KonferenzbandKonferenzbeitragBegutachtung

143 Zitate (Scopus)

Abstract

This paper introduces a state estimation framework for legged robots that allows estimating the full pose of the robot without making any assumptions about the geometrical structure of its environment. This is achieved by means of an Observability Constrained Extended Kalman Filter that fuses kinematic encoder data with on-board IMU measurements. By including the absolute position of all footholds into the filter state, simple model equations can be formulated which accurately capture the uncertainties associated with the intermittent ground contacts. The resulting filter simultaneously estimates the position of all footholds and the pose of the main body. In the algorithmic formulation, special attention is paid to the consistency of the linearized filter: it maintains the same observability properties as the nonlinear system, which is a prerequisite for accurate state estimation. The presented approach is implemented in simulation and validated experimentally on an actual quadrupedal robot.

OriginalspracheEnglisch
TitelRobotics
UntertitelScience and Systems VIII
Redakteure/-innenNicholas Roy, Paul Newman, Siddhartha Srinivasa
Herausgeber (Verlag)MIT Press Journals
Seiten17-24
Seitenumfang8
ISBN (Print)9780262519687
PublikationsstatusVeröffentlicht - 2013
Extern publiziertJa
VeranstaltungInternational Conference on Robotics Science and Systems, RSS 2012 - Sydney, Australien
Dauer: 9 Juli 201213 Juli 2012

Publikationsreihe

NameRobotics: Science and Systems
Band8
ISSN (Print)2330-7668
ISSN (elektronisch)2330-765X

Konferenz

KonferenzInternational Conference on Robotics Science and Systems, RSS 2012
Land/GebietAustralien
OrtSydney
Zeitraum9/07/1213/07/12

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