Localization Technologies for Indoor Human

Localization Technologies for Indoor Human - Localization...

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Localization Technologies for Indoor Human Tracking Da Zhang, Feng Xia, Zhuo Yang, Lin Yao School of Software Dalian University of Technology Dalian 116620, China f.xia@ieee.org Wenhong Zhao College of Mechanical Engineering Zhejiang University of Technology Hangzhou 310032, China zwh2010@sina.com Abstract —The proliferation of wireless localization technologies provides a promising future for serving human beings in indoor scenarios. Their applications include real-time tracking, activity recognition, health care, navigation, emergence detection, and target-of-interest monitoring, among others. Additionally, indoor localization technologies address the inefficiency of GPS (Global Positioning System) inside buildings. Since people spend most of their time in indoor environments, indoor tracking service is in great public demand. Based on this observation, this paper aims to provide a better understanding of state-of-the-art technologies and stimulate new research efforts in this field. For these purposes, existing localization technologies that can be used for tracking individuals in indoor environments are reviewed, along with some further discussions. Keywords indoor localization; human tracking; signal measurement; positioning algorithms; wireless networking I. INTRODUCTION In the past decades, wireless localization technologies have undergone considerable progress. They gradually play an important role in all aspects of people's daily lives [1], including e.g. living assistant, navigation, emergency detection, surveillance/tracking of target-of-interest, and many other location-based services. Reliable, accurate, and real-time indoor tracking services are required by people even more strongly than ever. For example, with the severely increasing number of elder people, the aging population has become a burning issue for all modern societies around the world. It has consequently become an urgent problem how to monitor those old people effectively when they are at home or inside other buildings [2]. In addition, more and more attention has been paid to context-aware applications which can make our life easier and convenient [3]. The realization of these applications is essentially based on location information. For outdoor environments, GPS (Global Positioning System) plays a dominant role in localization [4]. However, it does not work well in indoor scenarios. This inefficiency is due to the weakness of signals emitted by GPS and their disability to penetrate most building materials. Therefore, GPS does not fit well in indoor environments where people spend most of their time. Even though GPS devices are becoming more and more promising and ponderable in the future and are able to provide sufficient precision for outdoor use, other effective technologies are demanded for indoor human/object tracking.
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Localization Technologies for Indoor Human - Localization...

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