物联网中基于RFID的移动标签定位方案

Localization Scheme for Mobile Tags Based on RFID in Internet of Things

当前基于RFID的定位系统无法使用异构移动阅读器按照分布式策略定位移动标签,且定位精度低下。针对这种情况,提出了LSMT-RFID系统。该系统使用一组异构移动式RFID阅读器来定位移动RFID标签,移动阅读器通过时间约束交错过程展开合作,附近的阅读器通过共享询问信息来相应地估计标签位置,并使用主动和被动协议来确保位置信息的及时传输。基于ns-3的仿真实验来评估方案的定位能力,重点考察了平均定位误差和定位延时。实验结果表明,本方案能实现有效定位。

In existing localization systems of using RFID technology,there is a lack of systems that localize mobile tags using heterogeneous mobile readers in a distributed manner, and positioning accuracy is low. We proposed the LSMT- RFID system for localizing mobile RFID tags using a group of ad hoc heterogeneous mobile RFID readers. Mobile read ers cooperate with each other through time-constrained interleaving processes,and those readers in neighborhood share interrogation information, estimate tag locations accordingly and employ both proactive and reactive protocols to ensure timely dissemination of location information. Simulation experiments based on ns-3 were set to the positioning capability of the scheme, especially, the average localization error and positioning delay. The results show that the proposed scheme can achieve effective positioning.