To identify targets without manpower interaction, RFID technology relies on wireless message exchange between tags and reader. In this way, RFID technology attracts attention in modern logistics industry. Limited by design complexity of RFID reader, collision happens when identifying a lot of tags. Current probabilistic anticollision algorithms have low identifying proba-bility. They are not efficient enough for identification of large number tags. An adoptive frame based anticollision algorithms ( AFA) is proposed in this paper. The analysis results show that this algorithm could adjust frame length adaptively, thus the i-dentifying probability rises.%无线识别技术基于无线射频标签与无线读卡器的信息交互,实现无需人工干预的标签识别,因此无线识别技术受到现代化物流的重视。由于中转站货物数量庞大,而读卡器的硬件设计必须考虑实现复杂度,因此在识别货物的无线标签过程中存在无线标签信息碰撞的现象。目前,概率性标签防碰撞算法的标签识别率较低,面对大量待识别标签的工作效率有限。本文提出一种自适应帧长的无线识别标签防碰撞算法AFA,分析结果表明该算法可以自适应调整检测帧长度,提高标签识别率。
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