公开(公告)号：US20060017545A1

公开(公告)日：2006-01-26

申请号：US11090334

申请日：2005-03-25

申请人： John Volpi ,  Steven Roemerman ,  Joseph Tepera ,  Logan Scott

发明人： John Volpi ,  Steven Roemerman ,  Joseph Tepera ,  Logan Scott

IPC分类号： H04Q5/22

CPC分类号： G06K19/0723 ,  G01S13/751 ,  G01S13/767 ,  G01S13/825 ,  G06K19/0739

摘要： A reply code for a radio frequency identification (RFID) tag, a method of improving a reply code for a radio frequency identification (RFID) tag for interrogation by an interrogator and an RFID tag employing the same. In one embodiment, the reply code includes a preamble having information about a quality of a clock associated with the RFID tag. The reply code also includes a tag identification (ID) code providing a digital signature for the RFID tag. The reply code still further includes an aftamble located aft of the preamble and having information about the quality of the clock. The aftamble cooperates with the preamble to improve a quality of the reply code for interrogation by an interrogator.

摘要翻译： 用于射频识别（RFID）标签的答复码，改进用于询问器询问的用于射频识别（RFID）标签的应答码的方法以及采用该标签的RFID标签。 在一个实施例中，回复代码包括具有关于与RFID标签相关联的时钟的质量的信息的前同步码。 回复代码还包括为RFID标签提供数字签名的标签标识（ID）代码。 回复码还包括位于前导码后方的后遗迹，并且具有关于时钟质量的信息。 后验协议与前导码相结合，以提高询问器询问的回复码的质量。

公开(公告)号：US06501955B1

公开(公告)日：2002-12-31

申请号：US09596653

申请日：2000-06-19

申请人： Randolph L. Durrant ,  Logan Scott ,  John K. Reece

发明人： Randolph L. Durrant ,  Logan Scott ,  John K. Reece

IPC分类号： H04Q720

CPC分类号： H04B7/2606 ,  G01S5/0273 ,  G01S5/14 ,  G01S11/02 ,  H04B7/155 ,  H04W16/26

摘要： A RF signal repeater system is added to a wireless communications network which increases user data rates at the periphery of the cellular coverage area by boosting the downlink (base station to mobile user) signal and uplink (mobile user to base station) signal. The RF signal repeater system includes a signal tagging means that adds a unique electronic signature to the repeated signal such that position determination errors due to a non-line of sight propagation path can be corrected. The repeated signal is received and processed with a location measurement unit to determine the time of arrival and to extract the signal tag of the repeated signal. The time of arrival measurement and recovered signal tag are then processed at a mobile location center to determine the true position of the transmitter.

摘要翻译： 将RF信号中继器系统添加到无线通信网络中，其通过将下行链路（基站到移动用户）信号和上行链路（移动用户到基站）信号升高来增加蜂窝覆盖区域的外围的用户数据速率。 RF信号中继器系统包括信号标签装置，其将独特的电子签名添加到重复信号，使得可以校正由于非线视线传播路径引起的位置确定错误。 用位置测量单元接收和处理重复的信号，以确定到达时间并提取重复信号的信号标签。 然后在移动位置中心处处理到达时间和恢复的信号标签，以确定发射机的真实位置。

公开(公告)号：US6094421A

公开(公告)日：2000-07-25

申请号：US786205

申请日：1997-01-21

申请人： Logan Scott

发明人： Logan Scott

IPC分类号： H04B7/26 ,  H04J3/06 ,  H04J13/00 ,  H04W24/00 ,  H04W28/06 ,  H04W48/08 ,  H04W72/02 ,  H04W72/12 ,  H04W74/06 ,  H04W76/02 ,  H04W88/08 ,  H04J3/00 ,  H04J1/00 ,  G01R3/08 ,  H04B1/44

CPC分类号： H04J13/00 ,  H04B7/2656 ,  H04J3/0682 ,  H04W56/0005 ,  H04W56/0045 ,  H04W56/009 ,  H04W24/00 ,  H04W28/06 ,  H04W48/08 ,  H04W74/06 ,  H04W76/02 ,  H04W88/08

摘要： A system and method for time division duplex communication over a single frequency band wherein guard time overhead is reduced by active adjustment of reverse link transmission timing as a function of round trip propagation time. A time frame is divided into a plurality of time slots, during each of which the base station transmits to a user station and the user station transmits to the base station. Communication is initiated by a round trip timing transaction. In response to a general polling message from the base station, a user station seeking to establish communication transmits a short reply message. The base station calculates the distance of the user station by measuring the propagation delay with respect to receipt of the reply message. The base station sends a timing adjustment command to the user station instructing the user station to advance or retard its timing according to the calculated distance, so as to minimize guard times between time slots. Thereafter, the base station monitors the user station transmissions and periodically commands the user station to advance or retard its timing in a like manner. The user station may transmit a control preamble at the start of each time slot to allow the base station to perform round trip timing calculations, and/or to allow adjustment of user station power or antenna selection. The system is capable of independently selecting frequency bands and time slots for a duplex communication link, providing a pure Time Division Duplex (TDD) mode, Frequency Division Duplex (FDD mode or Hybrid Time Division Duplex/Frequency Division Duplex (TDD/FDD) mode.

摘要翻译： 一种用于在单个频带上进行时分双工通信的系统和方法，其中通过作为往返传播时间的函数的反向链路传输定时的主动调整来减小保护时间开销。 时间帧被分成多个时隙，在每个时隙中，基站向用户站发送，并且用户站向基站发送。 通信由一个往返定时事务发起。 响应于来自基站的一般轮询消息，寻求建立通信的用户站发送短的应答消息。 基站通过测量相对于接收回复消息的传播延迟来计算用户站的距离。 基站向用户站发送定时调整命令，指示用户站根据计算出的距离推进或延迟其定时，以最小化时隙之间的保护时间。 此后，基站监视用户站传输，并周期性地命令用户站以类似的方式提前或延迟其定时。 用户站可以在每个时隙开始时发送控制前同步码，以允许基站执行往返定时计算，和/或允许调整用户站功率或天线选择。 该系统能够独立地选择用于双工通信链路的频带和时隙，提供纯时分双工（TDD）模式，频分双工（FDD模式或混合时分双工/频分双工（TDD / FDD）模式 。

公开(公告)号：US5745484A

公开(公告)日：1998-04-28

申请号：US465137

申请日：1995-06-05

申请人： Logan Scott

发明人： Logan Scott

IPC分类号： H04B1/7093 ,  H04B7/26 ,  H04J3/06 ,  H04J13/00 ,  H04J13/10 ,  H04W24/00 ,  H04W28/04 ,  H04W28/06 ,  H04W64/00 ,  H04W72/04 ,  H04W72/12 ,  H04W88/02 ,  H04W88/08 ,  H04W92/10

CPC分类号： H04W56/0045 ,  H04B1/7093 ,  H04B7/2681 ,  H04J13/0022 ,  H04J13/107 ,  H04J3/0682 ,  H04W56/003 ,  H04J13/102 ,  H04J2013/0037 ,  H04W74/0891 ,  H04W88/02 ,  H04W88/08 ,  H04W92/10

摘要： A system for time division multiplexed communication over a single frequency band in which guard time overhead is reduced by active adjustment of reverse link transmission timing as a function of round trip propagation time. In one embodiment, during a first portion of a time frame, a base station issues a single burst segmented into time slots comprising data directed to each user station. After a single collective guard time, the user stations respond, one by one, in allocated time slots on the same frequency as the base station, with only minimal guard times between each reception. In order to prevent interference among the user transmissions, the base station measures the round trip propagation time for each user station and commands the user stations to advance or retard their transmission timing as necessary. To establish the initial range of a new user station, a short message is sent by the new user station during the collective guard portion (or, alternatively, during an available time slot), from which the base station calculates the propagation delay and hence the distance of the user station. Messages sent from the base station to the user stations may be interleaved so as to reduce the effects of potential noise or interference.

公开(公告)号：US5689502A

公开(公告)日：1997-11-18

申请号：US463220

申请日：1995-06-05

申请人： Logan Scott

发明人： Logan Scott

IPC分类号： H04B7/26 ,  H04J3/06 ,  H04J13/00 ,  H04W28/06 ,  H04W48/08 ,  H04W48/16 ,  H04W72/12 ,  H04J1/00

CPC分类号： H04J13/00 ,  H04J3/0682 ,  H04W28/06 ,  H04W48/08 ,  H04W48/16

摘要： A system for efficient time division duplex communication between a base station and a plurality of user stations over multiple frequency bands whereby guard time overhead is reduced through use of an interleaved frame structure and active adjustment of reverse link transmission timing as a function of round trip propagation time. A time frame is divided into a plurality of time slots. A user station transmits a preamble over a user frequency band. The base station receives the preamble and transmits, in a given time slot, a forward link message over a base frequency band to a user station. The user station responds with a reverse link message over the user frequency band in a subsequent time slot. While the base station is transmitting to a first user station over the base frequency band, it receives messages from another user station over the user frequency band, using the time slot differential between forward and reverse link messages for round trip propagation. The base station may, based on a measured propagation delay, command the user station to adjust its reverse link transmission timing so as to allow for reduced guard times. The base station may also instruct the user station to adjust its power, or may perform antenna selection in a multi-antenna system, in response to receiving the preamble from the first user station. Base and user time slots may be offset to increase the amount of available propagation delay time for round trip messaging, and avoid simultaneous transmission and reception by a user station.

摘要翻译： 一种用于在多个频带上的基站和多个用户站之间进行有效的时分双工通信的系统，由此通过使用交织的帧结构减少保护时间开销并且作为往返传播的函数的反向链路传输定时的主动调整 时间。 时间帧被分成多个时隙。 用户站通过用户频带发送前导码。 基站接收前同步码，并且在给定的时隙中将基站频带上的前向链路消息发送给用户站。 用户站在随后的时隙中通过用户频带上的反向链路消息进行响应。 当基站通过基本频带发送到第一用户站时，它使用用于往返传播的前向和反向链路消息之间的时隙差分在用户频带上从另一个用户站接收消息。 基站可以基于测量的传播延迟来命令用户站调整其反向链路传输定时，以便减少保护时间。 响应于从第一用户站接收前导码，基站还可以指示用户站调整其功率，或者可以在多天线系统中执行天线选择。 基站和用户时隙可以被偏移以增加往返消息传递的可用传播延迟时间量，并且避免用户站的同时发送和接收。

公开(公告)号：US08391488B2

公开(公告)日：2013-03-05

申请号：US12354607

申请日：2009-01-15

申请人： Di Qiu ,  Sherman Lo ,  Per Enge ,  Logan Scott ,  Dan Boneh ,  Ron Karpf

发明人： Di Qiu ,  Sherman Lo ,  Per Enge ,  Logan Scott ,  Dan Boneh ,  Ron Karpf

IPC分类号： H04K1/00 ,  G01S13/00 ,  H04L9/32 ,  G06F7/04 ,  G06F17/30 ,  G08B13/00 ,  G01N23/00 ,  H04L12/28 ,  G01S1/00 ,  H04N7/167 ,  H04N7/16 ,  G06F11/30

CPC分类号： H04L9/083 ,  H04L9/0872 ,  H04L9/3242 ,  H04L2209/38 ,  H04L2209/601 ,  H04L2209/80

摘要： A data encryption and decryption system securely geoencrypts data using location-dependent navigation signals. To increase the entropy of the cryptographic key to guard against a brute-force attack, geoencryption is made to depend on largely time-independent characteristics of the navigation signals that are not easily spoofed, including the time difference of arrival, the envelope-to-cycle difference, the differential signal-to-noise, the signal envelope shape, and the directions of arrival of the navigation signal set.

摘要翻译： 数据加密和解密系统使用位置相关的导航信号安全地对数据进行加密。 为了增加加密密钥的熵以防止暴力攻击，地理加密取决于不容易被欺骗的导航信号的很大程度上与时间无关的特征，包括到达时间差， 周期差，差分信号对噪声，信号包络形状和导航信号组的到达方向。

公开(公告)号：US20080018469A1

公开(公告)日：2008-01-24

申请号：US11838094

申请日：2007-08-13

申请人： John Volpi ,  Logan Scott ,  David Hensley

发明人： John Volpi ,  Logan Scott ,  David Hensley

IPC分类号： G08B13/14

CPC分类号： G01S13/66 ,  A61B90/98 ,  A61B2090/0805 ,  G01S7/40 ,  G01S13/825 ,  G01S13/878 ,  G06K7/0008 ,  G06K17/00 ,  G06K2017/0045 ,  G06Q10/08 ,  G06Q10/087

摘要： An interrogator, methods of discerning the presence of an object, and interrogation systems employing the same. In one embodiment, the interrogation systems include multiple interrogators that communicate with a base command unit to track a location of an object. In another embodiment wherein the object is an RFID object (e.g., an object with an RFID tag), the interrogators employ signal processing techniques such as precharging the RFID object, and correlating a reference code with a reply code from the RIFD object using selected techniques to increase a sensitivity of the interrogator, especially for adverse environments. In other embodiments, the interrogation systems include variations of metal instruments and sponges employed therewith. In yet another embodiment, the interrogation system includes metal interrogators capable of discerning the presence of a metal object, especially in a presence of another metal object.

公开(公告)号：US20080018468A1

公开(公告)日：2008-01-24

申请号：US11838082

申请日：2007-08-13

申请人： John Volpi ,  Logan Scott ,  David Hensley

发明人： John Volpi ,  Logan Scott ,  David Hensley

IPC分类号： H04Q5/22 ,  G08B13/14

CPC分类号： G01S13/66 ,  A61B90/98 ,  A61B2090/0805 ,  G01S13/825 ,  G01S13/878 ,  G06K7/0008 ,  G06K17/00 ,  G06K2017/0045 ,  G06Q10/08 ,  G06Q10/087 ,  H04Q9/00 ,  H04Q2209/47

摘要： An interrogator, methods of discerning the presence of an object, and interrogation systems employing the same. In one embodiment, the interrogation systems include multiple interrogators that communicate with a base command unit to track a location of an object. In another embodiment wherein the object is an RFID object (e.g., an object with an RFID tag), the interrogators employ signal processing techniques such as precharging the RFID object, and correlating a reference code with a reply code from the RFID object using selected techniques to increase a sensitivity of the interrogator, especially for adverse environments. In other embodiments, the interrogation systems include variations of metal instruments and sponges employed therewith. In yet another embodiment, the interrogation system includes metal interrogators capable of discerning the presence of a metal object, especially in a presence of another metal object.

公开(公告)号：US20050201450A1

公开(公告)日：2005-09-15

申请号：US11071652

申请日：2005-03-03

申请人： John Volpi ,  Logan Scott ,  Eric McMurry

发明人： John Volpi ,  Logan Scott ,  Eric McMurry

IPC分类号： G06K7/00 ,  G06K17/00 ,  H04B1/69

CPC分类号： G06K7/10366 ,  G06K7/0008 ,  G06K2017/0051 ,  G06K2017/009

摘要： A control and processing system for use with an interrogator and an interrogation system employing the same. In one embodiment, the control and processing system includes a correlation subsystem having a correlator that correlates a reference code with a reply code from a radio frequency identification (RFID) tag and provides a correlation signal therefrom. The control and processing system also includes a decision subsystem that verifies a presence of the RFID tag as a function of the correlation signal.

摘要翻译： 一种与询问器一起使用的控制和处理系统以及采用该询问系统的询问系统。 在一个实施例中，控制和处理系统包括具有相关器的相关子系统，该相关器将参考码与来自射频识别（RFID）标签的回复码相关联并从其提供相关信号。 控制和处理系统还包括判定子系统，其根据相关信号来验证RFID标签的存在。

公开(公告)号：US06839539B2

公开(公告)日：2005-01-04

申请号：US10173912

申请日：2002-06-17

申请人： Randolph L. Durrant ,  Logan Scott ,  John K. Reece

发明人： Randolph L. Durrant ,  Logan Scott ,  John K. Reece

IPC分类号： G01S5/14 ,  G01S11/02 ,  G01S19/25 ,  G01S19/48 ,  H04B7/26 ,  H04B7/15 ,  H04Q7/20

CPC分类号： H04B7/2606 ,  G01S5/0273 ,  G01S5/14 ,  G01S11/02 ,  H04B7/155 ,  H04W16/26

摘要： A RF signal repeater system is added to a wireless communications network which increases user data rates at the periphery of the cellular coverage area by boosting the downlink (base station to mobile user) signal and uplink (mobile user to base station) signal. The RF signal repeater system includes a signal tagging means that adds a unique electronic signature to the repeated signal such that position determination errors due to a non-line of sight propagation path can be corrected. The repeated signal is received and processed with a location measurement unit to determine the time of arrival and to extract the signal tag of the repeated signal. The time of arrival measurement and recovered signal tag are then processed at a mobile location center to determine the true position of the transmitter.