Spatial Signal Attenuation Model of Active RFID Tags

摘要

How to achieve desired accuracy of RFID localization is challenging for high dynamic and sparse environments, especially for anisotropic RFID tags. We introduce a new method of measuring location of the active RFID tags in three-dimension space to improve localization accuracy. This research (i) provides directional signal-distribution models for both horizontal and vertical orientation of anisotropic active RFID tags, (ii) improves an attenuation model of RF signal with transmitting distance for real applications and (iii) deduces a spatial signal attenuation model of an active RFID tag (SSAM). The accuracy of the model is less than 4 dB for more than probability 50% based on the experimental results, location accuracy is up to 1 meter in 400 m2 experimental field.