The active badge location system
ACM Transactions on Information Systems (TOIS)
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IPSN '05 Proceedings of the 4th international symposium on Information processing in sensor networks
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AINAW '07 Proceedings of the 21st International Conference on Advanced Information Networking and Applications Workshops - Volume 02
MoteTrack: a robust, decentralized approach to RF-based location tracking
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IEEE Transactions on Signal Processing
Survey of Wireless Indoor Positioning Techniques and Systems
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IEEE Network: The Magazine of Global Internetworking
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A received signal strength- (RSS-)-based indoor location method (ILS) for person/assets location in indoor scenarios is presented in this paper. Theoretical bases of the method are the integral equations relating the electromagnetic (EM) fields with their sources, establishing a cost function relating the measured field at the receivers and the unknown position of the transmitter. The aim is to improve the EM characterization of the scenario yielding in a more accurate indoor location method. Regarding network infrastructure implementation, a set of receivers are deployed through the coverage area, measuring the RSS value from a transmitter node which is attached to the asset to be located. The location method is evaluated in several indoor scenarios using portable measurement equipment. The next step has been the network hardware implementation using a wireless sensor network: for this purpose, ZigBee nodes have been selected. Finally, RSS measurements variability due to multipath effects and nonline-of-sight between transmitter and receiver nodes is mitigated using calibration and a correction based on the difference between the free space field decay law and the measured RSS.