The self-position estimate algorithm of the multiple mobile robots which equipped two omnidirectional cameras and an accelerometer

Abstract

This paper proposes a self-position estimate algorithm for the multiple mobile robots, each robot uses two omnidirectional cameras and an accelerometer. In recent years, in Japan, the Great East Japan Earthquake and large-scale disasters have occurred frequently. From this, development of the searching robot which supports the rescue team to perform a relief activity at a large-scale disaster is indispensable. Then, this research has developed the searching robot group system with two or more mobile robots. In this research, the searching robot equips two omnidirectional cameras and an accelerometer. In order to perform distance measurement using two omnidirectional cameras, each parameter of an omnidirectional camera and the position and posture between two omnidirectional cameras have to be calibrated in advance. If there are few mobile robots, the calibration time of each omnidirectional camera does not pose a problem. However, if the calibration is separately performed when using two or more robots in a disaster site etc., it will take huge calibration time. Then, this paper proposed the algorithm which estimates a mobile robot's position and the parameter of the position and posture between two omnidirectional cameras simultaneously. The algorithm proposed in this paper extended Nonlinear Transformation (NLT) Method. This paper conducted the simulation experiment to check the validity of the proposed algorithm. In some simulation experiments, one mobile robot moves and observes the circumference of another mobile robot which has stopped at a certain place. This paper verified whether the mobile robot can estimate position using the measurement value when the number of observation times becomes 10 times in p/18 of observation intervals. The result of the simulation shows the effectiveness of the algorithm.