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Simultaneous landmark classification, localization and map building for an advanced sonar ring

Published online by Cambridge University Press:  01 May 2006

Saeid Fazli  and
Lindsay Kleeman
Saeid Fazli*
Affiliation:
ARC Centre for Perceptive and Intelligent Machines in Complex Environments (PIMCE), Intelligent Robotics Research Centre (IRRC), Department of Electrical and Computer Systems Engineering, Monash University, Australia. E-mail: lindsay.kleeman@eng.monash.edu.au
Lindsay Kleeman
Affiliation:
ARC Centre for Perceptive and Intelligent Machines in Complex Environments (PIMCE), Intelligent Robotics Research Centre (IRRC), Department of Electrical and Computer Systems Engineering, Monash University, Australia. E-mail: lindsay.kleeman@eng.monash.edu.au
*
*Corresponding author. E-mail: saeid.fazli@eng.monash.edu.au
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Summary

An autonomous mobile robot operating in an unknown indoor environment often needs to map the environment while localizing within the map. Feature-based world models including line and point features are widely used by researchers. This paper presents a novel delayed-classi-fication algorithm to categorize these features using a recently developed high-performance sonar ring within a simultaneous localization and map-building (SLAM) process. The sonar ring sensor accurately measures range and bearing to multiple targets at near real-time repetition rates of 11.5 Hz to 6 m range, and uses 24 simultaneously fired transmitters, 48 receivers and multiple echoes per receiver. The proposed algorithm is based on hypothesis generation and verification using the advanced sonar ring data and an extended Kalman filter (EKF) approach. It is capable of initiating new geometric features and classifying them within a short distance of travel of about 10 cm. For each new sonar reading not matching an existing feature, we initiate a pair of probational line and point features resulting from accurate range and bearing measurements. Later measurements are used to confirm or remove the probational features using EKF validation gates. The odometry error model of the filter allows for variations in effective wheel separation required by pneumatic robot tyres. The implementation of the novel classification and SLAM algorithm is discussed in this paper and experimental results using real sonar data are presented.

Keywords

SonarMap buildingSonar ringClassificationSLAMOdometry
Type
Article
Information
Robotica , Volume 25 , Issue 3 , May 2006 , pp. 283 - 296
Copyright
Copyright © Cambridge University Press 2006

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