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1. 发明授权

EP2564229B2 RFID TAG LOCATION SYSTEMS 有权
公开(公告)号：EP2564229B2
公开(公告)日：2020-07-29
申请号：EP11719049.6
申请日：2011-04-18
申请人： Cambridge Enterprise Limited
发明人： SABESAN, Sithamparanathan , CRISP, Michael , PENTY, Richard , WHITE, Ian
IPC分类号： G01S5/14 , G01S13/84

2. 发明公开

EP2564229A2 RFID TAG LOCATION SYSTEMS 有权
标题翻译： RFID标签跟踪系统
公开(公告)号：EP2564229A2
公开(公告)日：2013-03-06
申请号：EP11719049.6
申请日：2011-04-18
申请人： Cambridge Enterprise Limited
发明人： SABESAN, Sithamparanathan , CRISP, Michael , PENTY, Richard , WHITE, Ian
IPC分类号： G01S5/14 , G01S13/84
CPC分类号： G06K19/0723 , G01S7/42 , G01S13/84 , G01S13/878
摘要： We describe a methods of locating an RFID tag. One method comprises: transmitting tag location signals from a plurality of different transmit antennas, wherein said antennas are spaced apart by more than a near field limit distance at a frequency of a said signal; receiving a corresponding plurality of receiving return signals from said tag; and processing said tag return signals to determine a range to said tag; wherein said transmitting comprises transmitting at a plurality of different frequencies; wherein said processing comprises determining a phase difference at said plurality of different frequencies to determine said range, and wherein said determining of said phase difference determines a phase difference between either i) two or more of said transmit signals resulting in a maxima in the returned signal RSSI or ii) a first transmit signal and its corresponding return signal; and wherein said determining of said range to said tag uses said return signals weighted responsive to a respective received signal strength of the return signal. Further data which may be used for averaging may be generated by using the above techniques along with changes in the polarisation state of the transmit and receive antennas and/or physical reconfiguration of the antennas (e.g. switch the transmit and receive elements).

3. 发明授权

EP2564467B2 RFID TAG INTERROGATION SYSTEMS 有权
公开(公告)号：EP2564467B2
公开(公告)日：2020-10-28
申请号：EP11719050.4
申请日：2011-04-18
申请人： Cambridge Enterprise Limited
发明人： SABESAN, Sithamparanathan , CRISP, Michael , PENTY, Richard , WHITE, Ian, Professor
IPC分类号： H01Q3/26 , H01Q3/22 , G06K7/00 , G06K7/10

4. 发明公开

EP3685302A1 RFID SYSTEMS 有权
公开(公告)号：EP3685302A1
公开(公告)日：2020-07-29
申请号：EP18779746.9
申请日：2018-09-18
申请人： Cambridge Enterprise Limited
发明人： CRISP, Michael , WHITE, Ian H. , PENTY, Richard , FU, Zhe , SABESAN, Sithamparanathan
IPC分类号： G06K7/00 , G06K7/10

5. 发明授权

EP2564467B1 RFID TAG INTERROGATION SYSTEMS 有权
标题翻译： RFID标签信息系统
公开(公告)号：EP2564467B1
公开(公告)日：2017-10-25
申请号：EP11719050.4
申请日：2011-04-18
申请人： Cambridge Enterprise Limited
发明人： SABESAN, Sithamparanathan , CRISP, Michael , PENTY, Richard , WHITE, Ian, Professor
IPC分类号： H01Q3/26 , H01Q3/22 , G06K7/00 , G06K7/10
摘要： We describe an RFID tag reading system comprising a plurality of transmit/receive antennas to provide spatial transmit/receive signal diversity, and a tag signal decoder. The system combines received RF signals from the antennas, and the antennas are spaced apart from one another sufficiently for one said antenna not to be within the near field of another. The system performs a tag inventory cycle comprising a plurality of tag read rounds, each having a set of time slots during which a said tag is able to transmit tag data including a tag ID. The system is configured to perform, during a tag inventory cycle, one or both of: a change in a frequency of the tag interrogation signals transmitted simultaneously from the plurality of antennas, and a change in a relative phase of a the RF tag interrogation signal transmitted from one of the antennas with respect to another.

6. 发明授权

EP2564229B1 RFID TAG LOCATION SYSTEMS 有权
标题翻译： RFID标签跟踪系统
公开(公告)号：EP2564229B1
公开(公告)日：2016-11-23
申请号：EP11719049.6
申请日：2011-04-18
申请人： Cambridge Enterprise Limited
发明人： SABESAN, Sithamparanathan , CRISP, Michael , PENTY, Richard , WHITE, Ian
IPC分类号： G01S5/14 , G01S13/84
摘要： We describe a methods of locating an RFID tag. One method transmits tag location signals at a plurality of different frequencies from a plurality of different antennas spaced apart by more than a near field limit distance. The processing determines a phase difference at the plurality of different frequencies by determining a phase difference between either i) two or more of the transmit signals resulting in a maxima in the returned signal RSSI or ii) a first transmit signal and its corresponding return signal. The range determining uses return signals weighted by signal strength. Further data which may be used for averaging may be generated by using the above techniques along with changes in the polarisation state of the transmit and receive antennas and/or physical reconfiguration of the antennas (e.g. switch the transmit and receive elements).

7. 发明公开

EP2564467A1 RFID TAG INTERROGATION SYSTEMS 有权
标题翻译：带有RFID标签的查询系统
公开(公告)号：EP2564467A1
公开(公告)日：2013-03-06
申请号：EP11719050.4
申请日：2011-04-18
申请人： Cambridge Enterprise Limited
发明人： SABESAN, Sithamparanathan , CRISP, Michael , PLENTY, Richard , WHITE, Ian, Professor
IPC分类号： H01Q3/26 , H01Q3/22 , G06K7/00 , G06K7/10
摘要： We describe an RFID tag reading system comprising a plurality of transmit/receive antennas to provide spatial transmit/receive signal diversity, and a tag signal decoder. The system combines received RF signals from the antennas, and the antennas are spaced apart from one another sufficiently for one said antenna not to be within the near field of another. The system performs a tag inventory cycle comprising a plurality of tag read rounds, each having a set of time slots during which a said tag is able to transmit tag data including a tag ID. The system is configured to perform, during a tag inventory cycle, one or both of: a change in a frequency of the tag interrogation signals transmitted simultaneously from the plurality of antennas, and a change in a relative phase of a the RF tag interrogation signal transmitted from one of the antennas with respect to another.

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