标签运动状态下的RFID系统反碰撞算法

Anti-collision algorithm for RFID system with moving tags

针对现实应用中标签经常处于运动状态的情况,对传送带模型下的无线射频识别(RFID)系统进行了分析,并使用Matlab做了相应的仿真实验。结果证明,当标签密度D与传送带速度V保持不变时,识别率P在帧长度N与作用范围内未识别标签数n相等时最高。当时隙持续时间一定时,识别率P只与V和D有关,而与作用区域内传送带长度L无关。同时针对该模型,对现有的标签估算方法进行了修正,在此基础上提出了一种新的估算方法,该方法的准确度在标签数目较大时有着明显的提高。

For practical application,the tags of Radio Frequency Identification（RFID） system are often moving.An RFID system on a conveyor belt was analyzed and simulated using Matlab.The result showed that if the tag density on the conveyor belt D and the conveyor belt speed V were constant,the identification rate became the maximum when the frame size N was equal to the number of unidentified tags n.When the slot duration was constant,the identification rate was only relative with D and V,and would not be affected by the conveyor belt length L in reader＇s coverage.Meanwhile,the existing tag estimation methods were amended according to the model of conveyor belt and a new estimation method was proposed,which significantly improved the precision in the case of large number of tags compared to other estimating methods.