This article addresses SLAM and navigation frame using low-cost sensor systems as a practical solution in an indoor environment. It is divided into three major modules according to their functionality: 1) initial mapping by VR-SLAM (Vision and Range sensor-SLAM) while exploring an unknown environment, 2) task-based navigation to guarantee safe motion under dynamic environmental changes and 3) failure recovery to improve system reliability. These modules work with a stereo camera, ultrasonic and infrared sensors combined. In this article, we will describe the navigation frame, especially, focusing on VR-SLAM.
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