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    • 5. 发明申请
    • RFID Technology
    • RFID技术
    • US20090231138A1
    • 2009-09-17
    • US12048842
    • 2008-03-14
    • Kin Yue Albert LAISiu Chong TINOn Yung Timmy WONGChi Chiu CHEUNG
    • Kin Yue Albert LAISiu Chong TINOn Yung Timmy WONGChi Chiu CHEUNG
    • H04Q5/22G08B13/14
    • H04Q9/00G06K19/0707G06K19/0712G06K19/0723H04Q2209/47H04Q2209/753H04Q2209/883
    • A method of selectively waking up a plurality of RFID tags includes (a) providing a first RFID tag; (b) programming the first RFID tag to respond and wake up only to signals at a first sub-carrier frequency or with a first code; (c) providing a second RFID tag; and (d) programming the second RFID tag to respond and wake up only to signals at a second sub-carrier frequency or with a second code. A method of operating an RFID tag positioning system includes (a) positioning two real time location tracking active RFID readers in two respective locations; (b) positioning a first calibrating RFID tag at a fixed and known position; (c) moving a second calibrating RFID tag along a pre-determined path; (d) obtaining the first RFID reader's readings of location-related information of the RFID tags at a point in time; (e) obtaining the second RFID reader's readings of location-related information of the RFID tags at that point in time; and (f) comparing the readings with the known positions of the first and second calibrating tags.
    • 选择性地唤醒多个RFID标签的方法包括(a)提供第一RFID标签; (b)对第一RFID标签进行编程以响应并仅以第一子载波频率或第一代码唤醒信号; (c)提供第二RFID标签; 以及(d)对所述第二RFID标签进行编程,以响应并仅以第二子载波频率或第二代码唤醒信号。 一种操作RFID​​标签定位系统的方法包括:(a)将两个实时位置跟踪有源RFID读取器定位在两个相应位置; (b)将第一校准RFID标签定位在固定和已知位置; (c)沿着预定的路径移动第二校准RFID标签; (d)在某个时间点获得RFID标签的位置相关信息的第一RFID阅读器读数; (e)在该时间点获得第二RFID阅读器读取RFID标签的位置相关信息; 和(f)将读数与第一和第二校准标签的已知位置进行比较。