文章基本信息

标题：A GPS Sensing Strategy for Accurate and Energy-Efficient Outdoor-to-Indoor Handover in Seamless Localization Systems
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作者：Yungeun Kim, Songhee Lee, Seokjoon Lee ; Hojung Cha
期刊名称：Mobile Information Systems
印刷版ISSN：1574-017X
出版年度：2012
卷号：8
DOI：10.3233/MIS-2012-00151
出版社：Hindawi Publishing Corporation
摘要：Indoor localization systems typically locate users on their own local coordinates, while outdoor localization systems use global coordinates. To achieve seamless localization from outdoors to indoors, a handover technique that accurately provides a starting position to the indoor localization system is needed. However, existing schemes assume that a starting position is known a priori or uses a naïve approach to consider the last location obtained from GPS as the handover point. In this paper, we propose an accurate handover scheme that monitors the signal-to-noise ratio (SNR) of the effective GPS satellites that are selected according to their altitude. We also propose an energy-efficient handover mechanism that reduces the GPS sampling interval gradually. Accuracy and energy efficiency are experimentally validated with the GPS logs obtained in real life.