基于信号强度差的RFID室内定位研究

针对RFID室内定位中使用异种标签以及标签电量差异引起的信号强度差异的问题,提出一种新的基于SSD(Signal Strength Difference)的RFID指纹定位模型。该模型引入虚拟参考点,在离线阶段根据信号传播模型计算虚拟参考点的RSSI,建立SSD指纹地图,利用SSD消除异构定位读写器及电子标签的差异并解决由时间的变化引起的标签RSSI衰减问题；在在线定位阶段,采用位置匹配求交集的方法消除噪声点,然后利用K-NN算法估计目标位置。实验表明该模型具有较好的健壮性和较高的定位精度。

Research on SSD-based RFID Indoor Location Method

Aimming at the signal strength difference caused by using different tags and power differnece of tag in RFID indoor location,this paper proposed a new signal strength difference(SSD) based RFID fingerprint position model.The model introduces a virtual reference point.At the offline stage,it computes the RRSI of virtual reference point according to the signal transmission model,establishes SSD fingerprint map,and uses SSD to eliminate difference of device and overcome the attenuation of RSSI with time.At online stage,it uses the method of position matching seeking intersection to eliminate noise,and then uses the K-NN algorithm to estimate the target location.The experiment proves that the proposed location model is robust and has better accuracy.