Persons and Object Tracking Through Passive Tags

Abstract

Efficient and accurate tracking of device-free objects is critical for anti-intrusion systems. Prior solutions for device-free object tracking are mainly based on costly sensing infrastructures, resulting in barriers to practical applications. In this paper, we propose an accurate and efficient person and object detection system, to track device-free objects based on cheap passive RFID tags. This is the RFID system that can estimate the authorized and unauthorized person’s and as well objects as well as the current location of a device-free object by measuring critical power variation sequences of passive tags. Compared with previous solutions, the unique advantage of this sytem, enables object tracking using a much sparser tag deployment. We contribute to both theory and practice of this phenomenon by presenting the interference model that precisely explains it and using extensive experiments to validate it. We design a practical RFID Tracking system based intrusion detection system and implement a prototype by commercial off-the-shelf (COTS) RFID reader and tags. The realworld experiments results show that this is effective in tracking the trajectory of moving object various environments.