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    Method and system for communicating with and tracking RFID transponders
    2.
    发明授权
    Method and system for communicating with and tracking RFID transponders 有权
    用于与RFID应答器进行通信和跟踪的方法和系统

    公开(公告)号：US07253717B2

    公开(公告)日：2007-08-07

    申请号：US09726136

    申请日：2000-11-29

    申请人： John T. Armstrong ,  John D. Richert ,  John P. Palmer

    发明人： John T. Armstrong ,  John D. Richert ,  John P. Palmer

    IPC分类号： H04Q5/22

    CPC分类号： G08B13/2488 ,  G06K7/0008 ,  G06K7/10039 ,  G06K7/10316 ,  G06K7/10356 ,  G06K2017/007 ,  G08B13/2417

    摘要： An RFID system and method for communicating between a host computer, one or more interrogators connected to the host computer, and a large body of transponders distributed within an area covered by the interrogators. Each transponder originally has a common identification code, and upon initialization by the host computer internally generates a unique identification code based upon an internally generated random number. The host, through the interrogators, reads each of the identification codes associated with each transponder by iteratively transmitting a read identification code command along with a controlled variable. Each transponder compares the received controlled variable to an internally generated random number, and selectively transmits its identification code based upon the outcome of this comparison. After the completion of each read identification code iteration, the host adjusts the controlled variable based upon the responses received in the previous iteration. Preferably, communications between the interrogators and the transponders are DSSS signals in TDMA format, and the transponders use the random number generator to assign a time slot for transmission of their response. Each interrogator includes an antenna system utilizing a switch matrix to connect multiple antennas having different polarizations, which ensures that all transponders within the range of the interrogator receive the signals from the interrogator. In a further aspect, the interrogators are arranged in groups, each group in nearest neighbor format, to reduce the time for reading the transponders and the emissions generated when more than one interrogator is active at the same time.

    摘要翻译： 用于在主计算机，连接到主计算机的一个或多个询问器和分布在由询问器覆盖的区域内的大量转发器之间进行通信的RFID系统和方法。 每个应答器最初具有公共识别码，并且在主计算机初始化之后，内部基于内部生成的随机数来生成唯一的识别码。 主机通过询问器通过迭代地发送读取的识别代码命令以及受控变量读取与每个转发器相关联的每个识别代码。 每个应答器将接收到的受控变量与内部产生的随机数进行比较，并且基于该比较的结果选择性地发送其识别码。 在每次读取识别代码迭代完成之后，主机根据在先前迭代中接收到的响应来调整受控变量。 优选地，询问器和应答器之间的通信是TDMA格式的DSSS信号，并且应答器使用随机数发生器为其响应的传输分配时隙。 每个询问器包括利用开关矩阵连接具有不同极化的多个天线的天线系统，这确保询问器范围内的所有应答器接收来自询问器的信号。 在另一方面，询问器被分组布置，每组以最邻近的格式排列，以减少用于读取应答器的时间和当多个询问器同时处于活动状态时产生的排放。

    Method and system for communicating with and tracking RFID transponders
    4.
    发明授权
    Method and system for communicating with and tracking RFID transponders 有权

    公开(公告)号：US07626488B2

    公开(公告)日：2009-12-01

    申请号：US11469477

    申请日：2006-08-31

    申请人： John T. Armstrong ,  John D. Richert ,  John P. Palmer

    发明人： John T. Armstrong ,  John D. Richert ,  John P. Palmer

    IPC分类号： H04Q5/22

    CPC分类号： G08B13/2488 ,  G06K7/0008 ,  G06K7/10039 ,  G06K7/10316 ,  G06K7/10356 ,  G06K2017/007 ,  G08B13/2417

    摘要： An RFID system and method for communicating between a host computer, one or more interrogators connected to the host computer, and a large body of transponders distributed within an area covered by the interrogators. Each transponder originally has a common identification code, and upon initialization by the host computer internally generates a unique identification code based upon an internally generated random number. The host, through the interrogators, reads each of the identification codes associated with each transponder by iteratively transmitting a read identification code command along with a controlled variable. Each transponder compares the received controlled variable to an internally generated random number, and selectively transmits its identification code based upon the outcome of this comparison. After the completion of each read identification code iteration, the host adjusts the controlled variable based upon the responses received in the previous iteration. Preferably, communications between the interrogators and the transponders are DSSS signals in TDMA format, and the transponders use the random number generator to assign a time slot for transmission of their response. Each interrogator includes an antenna system utilizing a switch matrix to connect multiple antennas having different polarizations, which ensures that all transponders within the range of the interrogator receive the signals from the interrogator. In a further aspect, the interrogators are arranged in groups, each group in nearest neighbor format, to reduce the time for reading the transponders and the emissions generated when more than one interrogator is active at the same time.

    Transmitted reference spread spectrum communication using a single carrier with two mutually orthogonal modulated basis vectors
    10.
    发明授权
    Transmitted reference spread spectrum communication using a single carrier with two mutually orthogonal modulated basis vectors 失效
    使用具有两个相互正交调制的基矢量的单载波的传输参考扩频通信

    公开(公告)号：US5559828A

    公开(公告)日：1996-09-24

    申请号：US324844

    申请日：1994-10-18

    申请人： John T. Armstrong ,  John D. Richert

    发明人： John T. Armstrong ,  John D. Richert

    IPC分类号： H04B1/707 ,  H04L27/18 ,  H04B1/69 ,  H04J13/02 ,  H04J13/04

    CPC分类号： H04B1/707 ,  H04L27/18

    摘要： The disclosed spread spectrum system has the reference transmitted on one phase (basis vector) of a .pi./2-offset QPSK signal, and the spread data signal transmitted on another phase (basis vector). The two received phases are combined to recover the baseband signal. Such a transmission system is tolerant to multipath dispersion since all delay paths carry an appropriately delayed reference and signal path induced dispersion on the spread data signal is also present on the reference. If one of the two signals is delayed by a predetermined time interval and a corresponding delay is present in each of two cross-coupled signal processing paths following a conventional I-Q demodulator, the resulting two phase quadrature baseband signals may be combined to form a replica of the original baseband signal. The resultant asynchronous demodulation eliminates the usual requirement for carrier lock at the receiver and is therefore tolerant to Doppler shifts and other frequency errors. Both the asynchronous and synchronous (coherent demodulation) embodiments offer multiple use of the same center frequency through a novel "delay division" multiplexing concept.

    摘要翻译： 所公开的扩频系统具有在pi / 2-偏移QPSK信号的一个相位（基矢量）上传输的参考，并且在另一个相位（基矢量）上传输的扩展数据信号。 两个接收相位被组合以恢复基带信号。 这样的传输系统是容忍多路径色散的，因为所有延迟路径都携带适当延迟的参考信号，并且扩频数据信号上的信号路径感应色散也存在于参考。 如果在常规IQ解调器之后的两个交叉耦合信号处理路径中的每一个中，两个信号中的一个被延迟预定的时间间隔并且相应的延迟存在，则所得到的两相正交基带信号可以被组合以形成 原始基带信号。 所得到的异步解调消除了在接收机处的载波锁定的通常要求，并且因此容忍多普勒频移和其他频率误差。 异步和同步（相干解调）实施例通过新颖的“延迟分割”复用概念提供了相同中心频率的多次使用。