一种功率可调的RFID室内动态定位方法

A Power-Adjustable Method for RFID-based Dynamic Positioning

基于RFID技术的室内定位算法,大多都要求阅读器具有记录RSSI、TOA等测量参数的功能,这对于阅读器和标签的要求较高,从而导致整个系统的成本较高。RFID动态定位方法是一种新型的通过参考标签和移动RFID阅读器进行定位的方法,无须记录RSSI等测量参数,思路简单,却实现了较高精度的定位(可达数10cm级),然而定位路径较为盲目,定位效率低下。为改善这一问题,本文提出了一种功率可调的动态定位方法,同时为方便在定位过程中即时观察阅读器阅读参考标签和目标标签情况,设计了动态定位的MATLAB GUI界面。实验结果表明,与原动态定位方法相比,功率可调的动态定位方法在很大程度上节省了定位时间,提高了定位效率,且对于边界处的目标标签定位,定位精度提高了近20%。

Most of the indoor positioning algorithms based on RFID require the reader to record some measured parameters such as RSSI and TOA, which results in a high cost of the entire system. The RFID-based dynamic positioning scheme is an innovative method to locate a target tag by a system with a moving RFID reader and some reference tags without recording any measured parameters. Although the positioning accuracy can be tens of centimeters, the location path is blind, which results in a poor positioning efficiency. To solve this problem, this paper proposes a power-adjustable method for dynamic positioning. Moreover, a MATLAB GUI is designed for monitoring the status of all the tags read by the moving reader whenever necessary. Results of experiments indicate that the proposed poweradjustable method could save considerable time for positioning and improve the efficiency of the system compared with the original dynamic positioning scheme. Besides, the positioning accuracy for the target tag on the border of the area could increase by nearly 20 %.