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    • 6. 发明授权
    • Performance enhancement algorithm for radio frequency identification (RFID) systems
    • 射频识别(RFID)系统的性能增强算法
    • US07548165B2
    • 2009-06-16
    • US11397160
    • 2006-04-04
    • John F. BraunJean-Hiram CoffyArthur J. ParkosMichael P. Swenson
    • John F. BraunJean-Hiram CoffyArthur J. ParkosMichael P. Swenson
    • G08B13/14
    • H04B7/0606
    • A method for enhancing the accuracy a Radio Frequency IDentification (RFID) system which may exhibit inconsistent RFID tag reporting behavior. The method includes the steps of (i) establishing a timeout setting indicative of the time that each interrogating antenna transmits RF energy within a respective read field, (ii) evaluating/comparing reporting results over multiple interrogation cycles to determine when an RFID tag exhibits inconsistent reporting behavior within the read field and (iii) increasing the timeout setting of the respective interrogating antenna to enhance the energy harvested by an RFID tag/device during each interrogation cycle. In lieu of, or in addition to, increasing the timeout setting, the method evaluates the responses received over multiple cycles and accepts such responses as being valid only when the same response is obtain over consecutive/sequential interrogation cycles. That is, the system evaluates the results of several cycles before accepting the validity or veracity of the response.
    • 一种提高射频识别(RFID)系统的精度的方法,其可能表现出不一致的RFID标签报告行为。 该方法包括以下步骤:(i)建立指示每个询问天线在相应读取场内发射RF能量的时间的超时设置,(ii)通过多个询问周期评估/比较报告结果,以确定RFID标签何时展现不一致 报告行为,以及(iii)增加相应询问天线的超时设置,以增强每个询问周期期间由RFID标签/设备收集的能量。 替代或者除了增加超时设置之外,该方法评估在多个周期中接收到的响应,并且仅当在连续/顺序询问周期获得相同的响应时才接受这样的响应才有效。 也就是说,系统在接受响应的有效性或真实性之前评估几个周期的结果。
    • 9. 发明授权
    • Adaptive radio frequency identification control algorithm
    • 自适应射频识别控制算法
    • US07561044B2
    • 2009-07-14
    • US11397244
    • 2006-04-04
    • John F. BraunJean-Hiram CoffyArthur J. ParkosMichael P. Swenson
    • John F. BraunJean-Hiram CoffyArthur J. ParkosMichael P. Swenson
    • G08B13/14
    • H04B7/0606G06Q20/203H04B5/0056H04B5/0062H04B5/02
    • A method for adaptively controlling a Radio Frequency IDentification (RFID) system having a plurality of interrogating antennas and RFID tags. The method comprises the steps of establishing a timeout setting indicative of the time that each interrogating antenna powers a read field during a respective read period and a threshold time period indicative of the time required to transmit energy/exchange data between the RFID tag and the interrogating antenna. A period differential is then calculated which is indicative of the difference between the timeout setting and the time elapsed for the final RFID tag within a respective read field to communicate its RFID tag information. The timeout setting for each interrogating antenna may then be adaptively tuned or varied in accordance with the period differential. To expedite and/or refine the adaptive tuning feature, a variance may also be calculated indicative of the difference between the threshold time period and the period differential. The timeout setting may be decremented when the threshold time period is greater than the period differential and/or variance and incremented when the time period is less than the period differential and/or variance. Such variation of the timeout setting is evaluated with each interrogation cycle of the RFID system.
    • 一种用于自适应地控制具有多个询问天线和RFID标签的射频识别(RFID)系统的方法。 该方法包括以下步骤:建立指示每个询问天线在相应读周期期间为读磁场供电的时间的超时设置和指示在RFID标签与询问之间传送能量/交换数据所需的时间的阈值时间周期 天线。 然后计算出周期差异,其表示超时设置与各个读取区域内的最终RFID标签经过的时间之间的差异,以传达其RFID标签信息。 然后可以根据周期差异自适应地调整或改变每个询问天线的超时设置。 为了加速和/或改进自适应调谐特征,还可以计算表示阈值时间段和周期差值之间的差异的方差。 当阈值时间段大于周期差和/或方差时,超时设置可以减小,并且当时间段小于周期差和/或方差时递增。 通过RFID系统的每个询问周期来评估超时设置的这种变化。