Height Estimation at Entrance With Passive RFIDs: Possibility, Design and Implementation

The height of an entrant is a critical parameter for many practical applications, e.g., the electrical controlling in smart homes and personalized recommendation in smart clothing stores. This paper explores the possibility, design and implementation of estimating the entrant’s height with low-cost passive RFID tags deployed in the entrance zone (e.g. the doorway). Taking the signal RSSI measurements as the input, we first identify the signal frames influenced by entrant’s passing through, and then convert the identified frames into a strength image, so that the his/her height can be estimated using a simple yet effective image analysis algorithm. We implement a prototype system of RFH with COTS RFID devices, and conduct extensive experiments to validate our design. The experimental results demonstrate that our scheme is able to achieve more than 80% acceptable accuracy in various scenarios with different parameter settings.