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公开(公告)号：US09810766B2
公开(公告)日：2017-11-07
申请号：US15185567
申请日：2016-06-17
Applicant: ZIH Corp.
Inventor： Robert W. Boyd
CPC classification number: G01S5/06 , G01S5/021 , G01S5/0221 , G01S5/10 , H04L5/0048 , H04W24/08
Abstract: An example method includes identifying a link that is one of a plurality of links of a wireless locating system, the link being defined by at least a reference signal source, a first receiver unit, and a second receiver unit; determining a reliability metric for signal transmission via a link based on first link data, the link data describing first reference signal events for the link; and modifying the reliability metric based on second link data describing second reference signal events for the link, wherein modifying the reliability metric includes: determining whether the second link data is consistent with the first link data; adjusting the reliability metric using a first function when the second link data is consistent with the first link data; and adjusting the reliability metric using a second function different than the first function when the second link data is inconsistent with the second link data.
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Patent Agency Ranking
公开(公告)号：US20180246201A1
公开(公告)日：2018-08-30
申请号：US15967244
申请日：2018-04-30
Applicant: ZIH CORP.
Inventor： David S. Wisherd , Robert W. Boyd
CPC classification number: G01S13/878 , G01S13/75
Abstract: An example system for locating passive RFID tags includes a narrowband RFID reader configured to transmit a narrowband RF signal to energize a passive RFID tag, thereby causing the passive RFID tag to create a backscatter reflection target; a first wideband transceiver configured to transmit a wideband RF signal; a second wideband transceiver configured to: receive the wideband RF signal reflected from the backscatter reflection target; and record time-of-arrival data for the reflected wideband signal; and processing circuitry configured to determine a location measurement of the passive tag based on the time-of-arrival data.
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公开(公告)号：US09983303B2
公开(公告)日：2018-05-29
申请号：US14329459
申请日：2014-07-11
Applicant: ZIH Corp.
Inventor： David S. Wisherd , Robert W. Boyd
CPC classification number: G01S13/878 , G01S13/75
Abstract: Systems, methods, apparatuses, and computer readable media are disclosed for providing timing-based distance measurement to a passive radio frequency identification (“RFID”) tag using one or more wideband RF signals synchronized with the standard narrowband RF signal. In some embodiments, the narrowband RF signal activates a passive RFID tag creating a backscatter reflection target which returns a modulated narrowband signal and a wideband signal from the passive RFID tag. The one or more wideband receivers determine time-of-flight and/or time-of-arrival measurements for the returned wideband signal. A location measurement is then calculated for the passive RFID tag using the tag data, the known location of the wideband transceivers, and the time-of-flight/time-of-arrival data.
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4.发明授权System and method for determining signal source location in wireless local area network 有权用于确定无线局域网中信号源位置的系统和方法公开(公告)号：US09519046B2
公开(公告)日：2016-12-13
申请号：US14989389
申请日：2016-01-06
Applicant: ZIH CORP.
Inventor： Robert W. Boyd
CPC classification number: G01S5/06 , G01S5/021 , G01S5/0215 , G01S5/0221 , H04W64/00 , H04W84/12
Abstract: Systems and methods for determining signal source location in wireless local area networks are disclosed. An example method includes receiving, from a first signal reader, a first time-of-arrival measurement for a first radio frequency (RF) signal generated by a first wireless local area network (WLAN) signal source located at a first known location, the first time-of-arrival measurement being relative to a first clock of the first signal reader; receiving, from a second signal reader, a second time-of-arrival measurement for the RF signal, the second time-of-arrival measurement being relative to a second clock of the second signal reader, wherein the first clock is not synchronized with the second clock; defining a first time relationship between the first clock and a system time based on the first time-of-arrival measurement; and defining a second time relationship between the second clock and the system time based on the second time-of-arrival measurement.
Abstract translation: 公开了用于确定无线局域网中的信号源位置的系统和方法。 示例性方法包括从第一信号读取器接收由位于第一已知位置处的第一无线局域网（WLAN）信号源产生的第一射频（RF）信号的第一到达时间测量， 第一到达时间测量值相对于第一信号读取器的第一时钟; 从所述第二信号读取器接收所述RF信号的第二到达时间测量值，所述第二到达时间测量值相对于所述第二信号读取器的第二时钟，其中所述第一时钟不与所述第二时钟同步 第二时钟 基于所述第一到达时间测量来定义所述第一时钟和系统时间之间的第一时间关系; 以及基于所述第二到达时间测量来定义所述第二时钟和所述系统时间之间的第二时间关系。
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公开(公告)号：US20160291126A1
公开(公告)日：2016-10-06
申请号：US15185567
申请日：2016-06-17
Applicant: ZIH Corp.
Inventor： Robert W. Boyd
CPC classification number: G01S5/06 , G01S5/021 , G01S5/0221 , G01S5/10 , H04L5/0048 , H04W24/08
Abstract: An example method includes identifying a link that is one of a plurality of links of a wireless locating system, the link being defined by at least a reference signal source, a first receiver unit, and a second receiver unit; determining a reliability metric for signal transmission via a link based on first link data, the link data describing first reference signal events for the link; and modifying the reliability metric based on second link data describing second reference signal events for the link, wherein modifying the reliability metric includes: determining whether the second link data is consistent with the first link data; adjusting the reliability metric using a first function when the second link data is consistent with the first link data; and adjusting the reliability metric using a second function different than the first function when the second link data is inconsistent with the second link data.
Abstract translation: 示例性方法包括识别作为无线定位系统的多个链路之一的链路，所述链路至少由参考信号源，第一接收机单元和第二接收机单元定义; 基于第一链路数据确定经由链路的信号传输的可靠性度量，所述链路数据描述所述链路的第一参考信号事件; 以及基于描述所述链路的第二参考信号事件的第二链路数据来修改所述可靠性度量，其中修改所述可靠性度量包括：确定所述第二链路数据是否与所述第一链路数据一致; 当所述第二链接数据与所述第一链接数据一致时，使用第一功能来调整所述可靠性度量; 以及当所述第二链路数据与所述第二链路数据不一致时，使用与所述第一功能不同的第二功能来调整所述可靠性度量。
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公开(公告)号：US20150097716A1
公开(公告)日：2015-04-09
申请号：US14329459
申请日：2014-07-11
Applicant: ZIH Corp.
Inventor： David S. Wisherd , Robert W. Boyd
IPC: G01S13/06
CPC classification number: G01S13/878 , G01S13/75
Abstract: Systems, methods, apparatuses, and computer readable media are disclosed for providing timing-based distance measurement to a passive radio frequency identification (“RFID”) tag using one or more wideband RF signals synchronized with the standard narrowband RF signal. In some embodiments, the narrowband RF signal activates a passive RFID tag creating a backscatter reflection target which returns a modulated narrowband signal and a wideband signal from the passive RFID tag. The one or more wideband receivers determine time-of-flight and/or time-of-arrival measurements for the returned wideband signal. A location measurement is then calculated for the passive RFID tag using the tag data, the known location of the wideband transceivers, and the time-of-flight/time-of-arrival data.
Abstract translation: 公开了用于使用与标准窄带RF信号同步的一个或多个宽带RF信号向无源射频识别（“RFID”）标签提供基于时基的距离测量的系统，方法，装置和计算机可读介质。 在一些实施例中，窄带RF信号激活无源RFID标签，产生反向散射反射目标，其返回调制的窄带信号和来自无源RFID标签的宽带信号。 一个或多个宽带接收机确定返回的宽带信号的飞行时间和/或到达时间测量值。 然后使用标签数据，宽带收发器的已知位置以及飞行时间/到达时间数据来计算无源RFID标签的位置测量。
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