关键词: 反碰撞, 无线射频识别, 运动标签, 标签估算, ALOHA算法

Abstract: 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.

Key words: anti-collision, Radio Frequency Identification (RFID), moving tag, tag estimation, ALOHA algorithm