基于改进ALOHA算法的RFID标签防碰撞研究

目的 为提高射频识别技术(Radio Frequency Identification,RFID)标签识别成功率,以及包装生产线自动分拣效率、智能化水平.方法 以包装生产线检测系统为研究对象,结合RFID技术设计一种自动包装、检测、配送系统.介绍RFID检测系统,主要包括标签、阅读器、天线和控制系统.针对RFID识别过程中标签碰撞问题,提出一种改进ALOHA算法,采用动态预测权值估计标签数目使标签数目与数据帧长度大致相等.通过实验验证ALOHA算法的有效性.结果 实验结果表明,碰撞比率平均值只有1.1％,整个系统的检测成功率可以达到99.6％;所述改进ALOHA算法可以有效避免标签碰撞.结论 该系统能够自动完成检验,并且用时较少,检验过程中正确率较高,具有较高的市场应用价值.

RFID Tag Anti-collision Based on Improved ALOHA Algorithm

In order to improve the success rate of Radio Frequency Identification (RFID) tag identification, automatic sorting efficiency and intelligent level of packaging production line, an automatic packaging, detection and distribution system is designed by combining RFID technology with the detection system of packaging production line as the research object. The RFID detection system is introduced, including tag, reader, antenna and control system. To solve the problem of tag collision in RFID identification, an improved ALOHA algorithm is proposed and the dynamic predictive weight is used to estimate the number of tags so that the number of tags is approximately equal to the length of the data frames. The validity of ALOHA algorithm is verified by experiments. Experimental results show that the average collision rate is only 1.1%, and the success rate of the whole system can reach 99.6%. The improved ALOHA algorithm can effectively avoid tag collision. The system can complete the inspection automatically with less time and higher accuracy. The designed inspection system can improve the inspection efficiency of packaging production line and has high market application value.