一种低代价非绑定式活动的识别方法  

A low-cost device-free activity recognition method

作　　者：孟宪佳[1] 纪青然 李荔垚 赵月 刘宝英 陈峰[1] MENG Xianjia;JI Qingran;LI Liyao;ZHAO Yue;LIU Baoying;CHEN Feng(School of Information Science and Technology,Northwest University,Xi′an 710127,China)

机构地区：[1]西北大学信息科学与技术学院,陕西西安710127

出　　处：《西北大学学报（自然科学版）》2018年第2期183-190,208,共9页Journal of Northwest University（Natural Science Edition）

基　　金：国家自然科学青年基金资助项目(61702416)

摘　　要：活动识别是解决老年人看护等问题的有效途径,现存非绑定式的活动识别系统通常使用昂贵或专用设备,导致大规模部署成本较高。该文提出了一种基于廉价的RFID(射频识别设备)标签的非绑定式活动识别系统。首先,利用基于史坦无偏似然估计算法对RFID信号去噪,然后,通过DTW算法解决相同活动在不同速度和方向上的匹配问题,最后,通过建立权重评价体系将RSS和相位值结合,准确识别活动。实验结果表明,该方法显著提高了活动识别的准确率。Activity recognition is an important and effective method for looking after patients and the aged.The device-free activity recognition system is widely applied into our daily life.Current research uses uneconomical equipments or even dedicated devices so that the cost-efficiency is low of large-scale deployments.A new device-free activity recognition system only using cheap RFID(Radio frequency identification devices)tags is proposed.Firstly,it deals with the RFID signals using a deniosing method based on the stein unbiased risk estimate.Secondly,it applies the DTW(Dynamic time warping)algorithm to solve this problem that the RSS and phase is different when the same activity is performed in different speeds.Finally,it combines both RSS and phase values by establishing a weight assessment method to accurately recognize each activity.The results demonstrate that the proposed method improve the accuracy of recognized activities.

关 键 词：RFID标签 非绑定式 RSS 相位 DTW 

分 类 号：TP393.0[自动化与计算机技术—计算机应用技术]