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Accelerometers --- Motion detectors --- Design.

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This SpringerBrief examines the use of cheap commercial passive RFID tags to achieve accurate device-free object-tracking. It presents a sensitive detector, named Twins, which uses a pair of adjacent passive tags to detect uncooperative targets (such as intruders). Twins leverages a newly observed phenomenon called critical state that is caused by interference among passive tags. The author expands on the previous object tracking methods, which are mostly device-based, and reveals a new interference model and their extensive experiments for validation. A prototype implementation of the Twins-based intrusion detection scheme with commercial off-the-shelf reader and tags is also covered in this SpringerBrief. Device-Free Object Tracking Using Passive Tags is designed for researchers and professionals interested in smart sensing, localization, RFID and Internet of Things applications. The content is also useful for advanced-level students studying electrical engineering and computer science.

Radio frequency identification systems. --- Indoor positioning systems (Wireless localization) --- Motion detectors. --- Automatic tracking. --- Tracking, Automatic --- Servomechanisms --- Tracking (Engineering) --- Motion sensors --- Detectors --- Indoor localization technologies (Wireless localization) --- Indoor positioning systems (Wireless communication systems) --- Positioning systems, Indoor (Wireless localization) --- Mobile geographic information systems --- Wireless localization --- Identification systems, Radio frequency --- RF/ID systems --- RFID systems --- Identification --- Radio telemetry --- Near-field communication --- Equipment and supplies --- Computer Communication Networks. --- Telecommunication. --- Communications Engineering, Networks. --- Information Systems Applications (incl. Internet). --- Electric communication --- Mass communication --- Telecom --- Telecommunication industry --- Telecommunications --- Communication --- Information theory --- Telecommuting --- Computer communication systems. --- Electrical engineering. --- Application software. --- Electric engineering --- Engineering --- Communication systems, Computer --- Computer communication systems --- Data networks, Computer --- ECNs (Electronic communication networks) --- Electronic communication networks --- Networks, Computer --- Teleprocessing networks --- Data transmission systems --- Digital communications --- Electronic systems --- Information networks --- Telecommunication --- Cyberinfrastructure --- Electronic data processing --- Network computers --- Application computer programs --- Application computer software --- Applications software --- Apps (Computer software) --- Computer software --- Distributed processing