NDLI: Using a-priori information to improve the accuracy of indoor dynamic localization

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Using a-priori information to improve the accuracy of indoor dynamic localization

Content Provider	ACM Digital Library
Author	Turgut, Begümhan Martin, Richard P.
Abstract	We are considering the problem of dynamic localization of human targets in an indoor environment, such as an office building, where GPS signals are not receivable. Previous work has shown that static localization is possible through the measurement of the wireless signal strengths. Dynamic localization (tracking) can be achieved by performing periodic static localizations and filling in the gaps through an appropriate filtering technique. We are using a sampling-importance-resampling particle filter which is a probabilistic reasoning technique for this purpose. In this paper we present approaches through which information about the environment (such as the floor plan of the building) and the target (such as the physical and social limitations of the human movement) can be incorporated in the prediction and weight update components of the particle filter. The particle filter requires information to be presented as conditional probability distributions, a format which presents both representational and computational efficiency challenges. In addition, the models need to consider both the a priori information and the operational details of the particle filter. Even technically correct models can reduce the accuracy of the localization, by inadvertently reducing the effective number of particles, which, in its turn, induces resampling errors. Through a series of experiments we show that the correct usage of a priori information can significantly improve the accuracy of dynamic localization.
Starting Page	396
Ending Page	404
Page Count	9
File Format	PDF
ISBN	9781605586168
DOI	10.1145/1641804.1641872
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2009-10-26
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Tracking Particle filters Localization Sampling
Content Type	Text
Resource Type	Article

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