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论述了基于DSP技术的RFID读写器设计方法。在描述RFID系统组成的基础上,给出了读写器的软硬件设计流程。重点阐述了DSP对接收信号的软件处理以及反冲撞功能的实现方法。该读写器已应用于开放式门禁系统中,实际应用结果表明其性能良好。 相似文献
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9%-16.3% compared to other ALOHA-based tag anti-collision algorithms when the number of tags is 1 000. 相似文献
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基于动态ALOHA算法的RFID反碰撞技术 总被引:2,自引:0,他引:2
简述了无源射频识别系统的组成、工作原理及数据碰撞问题。针对射频识别系统的技术要求和应用特点,提出一种基于时分多路的动态ALOHA反碰撞方法,并对其工作原理、可行性及实现过程进行了分析和论证。该方法无需增加硬件开销,应用成本低,适应性强。 相似文献
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Anti-Collision algorithm is one of the most important components of radio frequency identification (RFID) technology, which possesses a key position in the performance of the whole system. ALOHA algorithm is one of the most popular methods to solve the collision problem because of its efficiency and practicability. The grouping method has been developed for enhancing the performance of conventional ALOHA when there are thousands of tags. However, the existing grouping method has limitations in applications due to its rigorous requirements for the estimation of the number of backlog tags or the admirable characteristics of the tags' ID number. Working on the improvement of the grouping methods, we proposed an algorithm named split-ALOHA with a novel grouping method that split tags as a binary tree. The novel grouping method makes it more practicable than the existing grouping methods due to the simplified requirements for tags. Simulations of the proposed algorithm show the superior performance of a linearly increasing of the number of consumed time slots while the number of tags increases. The algorithm performance analysis between split-ALOHA and ALOHA algorithms with other grouping methods has been implemented in a proper way. 相似文献
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为防止汽车与前方物体发生碰撞,使汽车始终在安全车速下行驶,减少事故的发生,设计了一种基于激光测距的汽车安全报警装置,它采取激光探测技术,是一种声光电一体的高科技、高智能汽车防撞产品,在出现跟车距离小于安全距离等紧急情况时,发出警报,提醒驾驶员注意并采取减速或制动措施,从而达到有效预防追尾碰撞事故发生的目的,提高了汽车的主动安全性能。测试结果表明,在输入报警距离与制动距离时,均能实现不同方式的报警。 相似文献
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为了解决射频识别(RFID)系统中的多标签防碰撞问题,在分析帧时隙ALOHA算法的基础上,提出一种基于模运算标签分类的RFID标签防碰撞识别方法。引入一种检测信息碰撞的时隙选择信息,对标签所选取时隙的碰撞情况进行分析并估计标签数量;然后对标签EPC编码进行逐级的取模运算,将同余的标签归为一组。各个标签经过K次取模运算后,分为2k组,每组只有发生少量碰撞位的标签。再将标签按照分组对应的时隙发送,碰撞标签采用二叉树后退式算法处理。本方法极大的提高了标签的识别效率,适用于射频识别系统中阅读器对于大量电子标签的快速识别。 相似文献