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Journal of Robotics
Volume 2012 (2012), Article ID 587407, 11 pages
http://dx.doi.org/10.1155/2012/587407
Research Article

Geometric Parameter Identification of a 6-DOF Space Robot Using a Laser-Ranger

1State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin 150001, China
2Mechanical Engineering and Automation, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518057, China

Received 27 December 2011; Revised 7 March 2012; Accepted 8 March 2012

Academic Editor: Zhuming Bi

Copyright © 2012 Yu Liu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The geometric parameters of a space robot change with the terrible temperature change in orbit, which will cause the end-effector pose (position and orientation) error of a space robot, and so weakens its operability. With this in consideration, a new geometric parameter identification method is presented based on a laser-ranger attached to the end-effector. Then, independence of the geometric parameters is analyzed, and their identification equations are derived. With the derived identification Jacobian matrix, the optimal identification configurations are chosen according to the observability index O3. Subsequently, through simulation the geometric parameter identification of a 6-DOF space robot is implemented for these identification configurations, and the identified parameters are verified in a set of independent reference configurations. The result shows that in spite of distance measurement alone, pose accuracy of the space robot still has a greater improvement, so the identification method is practical and valid.