Object Detection and Localization by Passive RF Backscattering System

In this paper, we present a tagless object detection and localization method implemented by a commercial radio frequency identification (RFID) system. Tags in the RFID system have important applications in indoor locating, and these tags are often affixed to the target object. But for some special situations, it is necessary to develop the object localization method without attached tags. We increase the diversity of the RFID communication channels by pasting tags around the location scene, thus we can obtain more information of the target object and meanwhile no attached tags are needed. The target reflectivity image inside the capture volume is constructed using non-uniform Fourier domain sampling. We simulate the reflectivity image in CST Studio Suite and test the method in read-scale rooms, where high-precision location is realized and the object contour can be observed.