Hybrid Inertial Microwave Reflectometry for mm-Scale Tracking in RFID Systems

Abstract

The estimator showed good convergence for the y-coordinates except slight divergence between 0.8-1.15 s possibly because the actual y curve started changing its slope. . . .

Orientation sensing using backscattered phase from multi-antenna tag at 5.8 GHz

“…The accuracy can be improved if more than one quantity such as amplitude of backscattered signal is also considered in the analysis. Furthermore, if the tag is equipped with a tilt sensor such as an accelerometer, and its data is incorporated in the backscattered packet, the accuracy can be improved by manifolds by fusing and analyzing all three pieces of information, one such technique for fine-scale localization of a linearly moving tag has been presented in [8], [10]. However, for the purpose of orientation sensing, fusion of multiple quantities will be incorporated in future work.…”

“…Precise orientation monitoring of objects using RFID system can used in a variety of interesting applications including but not limited to creating RFID based virtual reality, and decrypting gestures and postures, etc. Proposed orientation sensing technique combined with a fine-scale localization technique such as [8] would revolutionize the field of object tracking.…”

“…When the tag moves towards or away from the reader, the distance propagated by signal also varies, thereby, changing the backscattered phase of the signal. The demodulated complex baseband signalS(d, t) at the reader can be expressed as [8]:…”

Application and Research of Active RFID-Based Positioning System in Sport Competition

“…Assuming the coordinate of virtual tag is (p, q), and the coordinates of actual reference label is (a, b), and define the RSSI value of the coordinates (x, y) is Sk(Tx, y), then we can be obtain RSSI value by equation (1), (2). Then, by building a similar map, the position coordinates error can be excluded, and the process is shown in fig 3. After obtaining the RSSI of virtual reference tag, it can be compared with the label which needs to be tested.…”

“…As in December 2014, The Application of RFID positioning and three-dimensional technology in highway Construction Safety Management has passed the acceptance at the research institute of Nanjing road, and used the video recognition, radio positioning and three-dimensional modeling techniques in highway construction safety management for the first time. It also can achieve the accurate positioning and statistics to the on-site vehicle, and improve the construction safety management [2]. Although, RFID positioning system has made great achievements in our country, the maturity has not come.…”