利用Fisher矩阵的RFID多标签最优分布检测方法

Method for detecting optimal distribution of RFID multiple tags based on Fisher matrix

射频识别多标签系统动态性能参数包括读取效率、识读距离等,现有算法提高射频识别多标签系统识读性能能力有限,笔者提出了合理利用标签几何分布提高射频识别系统性能的新方法.该方法引入Fisher矩阵作为判定依据,通过计算标签与阅读器方位角的Fisher矩阵行列式极值,获取多标签系统的最优几何分布.随后通过仿真对多标签几何分布与射频识别系统识读性能的关系进行分析评估,设计了托盘级射频识别标签应用系统,并以识读距离为动态性能检测参数,对多标签最优几何分布进行模拟动态环境性能测试.实验结果表明,通过Fisher矩阵获得标签最优分布的方法可以有效提高多标签系统的动态性能、减小识读误差.

Dynamic performance parameters of multiple tags in the RFID system includes reading efficiency,reading distance and so on.The improvement of existing algorithms for the reading performance of multiple tags is limited in the RFID system,so the geometric distribution of tags is arranged reasonably to improve the performance in this paper.In the Fisher matrix of evaluation,we calculate the extremum of the azimuth matrix and obtain the optimal geometric distribution of tags.Then the geometric distribution of multiple tags and the reading performance of the RFID system are evaluated in numerical simulation.Taking the reading distance as the dynamic performance parameter,we design the tray-level RFID application system and test the optimal geometric distribution of multiple tags in simulative dynamic environment.The results show that the optimal geometric distribution of tags,which is obtained by calculating the Fisher matrix,could improve the dynamic performance and reduce the reading error of multiple tags in the RFID system effectively.