Hsiao Rong-Shue, Kao Chun-Hao, Chen Tian-Xiang, Chen Jui-Lun
Technol Health Care. 2018;26(1):11-16. doi: 10.3233/THC-171402.
Typical radio frequency identification (RFID) access control system can be ineffective if an unauthorized person tailgates an authorized person through an access area.
To propose a system by using indoor locating and tracking techniques address this problem, which is to prevent unauthorized Alzheimer's and dementia patients from getting lost including by tailgating.
To achieve accurate target location, passive RFID deployment strategy is studied and a fingerprinting based passive RFID localization algorithm is proposed. The proposed system was evaluated in a building environment to simulate the performance of access control. RFID reader was installed on ceiling near the access area and tags were stitched on both shoulders of the experiment subject's garments.
The probability of the error distance within 0.3 m achieved 97% in the warning area; the location precision achieved 97% within 0.4 m in the monitoring area.
The result showed that if an unauthorized person enters the restricted area, the system can initiate an alert signal accurately. Therefore, the proposed system is very suitable to be used in nursing home or hospital to prevent unauthorized personnel and assets entering/exiting a confined location.
如果未经授权的人员尾随授权人员通过进入区域，典型的射频识别（RFID）访问控制系统可能会失效。
提出一种利用室内定位和跟踪技术解决此问题的系统，即防止未经授权的阿尔茨海默病和痴呆症患者走失，包括防止尾随。
为实现精确的目标定位，研究了无源RFID部署策略，并提出了一种基于指纹的无源RFID定位算法。在建筑环境中对所提出的系统进行评估，以模拟访问控制的性能。在进入区域附近的天花板上安装RFID阅读器，并将标签缝在实验对象服装的双肩上。
在警告区域内，误差距离在0.3米以内的概率达到97%；在监测区域内，位置精度在0.4米以内达到97%。
结果表明，如果未经授权的人员进入限制区域，系统可以准确发出警报信号。因此，所提出的系统非常适合用于养老院或医院，以防止未经授权的人员和资产进入/离开受限场所。
