Title :
Unobtrusive long-range detection of passive RFID tag motion
Author :
Jiang, Bing ; Fishkin, Kenneth P. ; Roy, Sumit ; Philipose, Matthai
Author_Institution :
Dept. of Electr. Eng., Univ. of Washington, Seattle, WA, USA
Abstract :
This paper presents a novel method for detecting the motion of passive radio-frequency-identification (RFID) tags within the field of a detecting antenna. The method allows the unobtrusive detection of human interactions with RFID-tagged objects without requiring any modifications to existing communications protocols or RFID hardware. We use the response rate (a metric in lieu of the true received RF-signal intensity) at the reader to study the impact of tag translation, rotation, and coupling, as well as environmental effects. Performance is improved by introducing the idea of multiple tags/readers. Movement-detection algorithms are developed and integrated into the RFID monitoring system, and verified by experiments that demonstrate excellent results.
Keywords :
radiofrequency identification; RF-signal intensity; RFID hardware; RFID monitoring system; RFID-tagged objects; communications protocols; detecting antenna; human interactions; movement detection; movement-detection algorithms; passive RFID tag motion; passive radio-frequency-identification tags; passive tags; radio-frequency identification; radio-frequency signal; response rate; tag translation; unobtrusive long-range detection; Biomedical monitoring; Humans; Motion detection; Object detection; Passive RFID tags; Power supplies; Protocols; Radio frequency; Radiofrequency identification; Technical Activities Guide -TAG; Movement detection; passive tags; radio-frequency (RF)-signal processing; radio-frequency identification (RFID); response rate;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.2005.861489
