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    METHOD AND DEVICES FOR TIME TRANSFER USING END-TO-END TRANSPARENT CLOCKS
    21.
    发明申请
    METHOD AND DEVICES FOR TIME TRANSFER USING END-TO-END TRANSPARENT CLOCKS 有权
    使用端到端透明时钟传输时间的方法和设备

    公开(公告)号：US20160170440A1

    公开(公告)日：2016-06-16

    申请号：US14566990

    申请日：2014-12-11

    Applicant: Khalifa University of Science, Technology, and Research ,  British Telecommunications plc ,  Emirates Telecommunications Corporation

    Inventor： James Aweya

    IPC: G06F1/12 ,  H04L29/08

    CPC classification number: G06F1/12 ,  G06F1/10 ,  H04L69/28

    Abstract: This invention relates to methods and devices for time transfer. The invention has particular application in the alignment of slave clocks to a master clock and dealing with packet delay variations. In embodiments of the invention, the slave clock uses the residence times measured by end-to-end transparent clocks to compensate for clock synchronization errors that arise due to variability in message transfer delays. Embodiments provide a simple linear approximation technique and a Kalman filter-based technique for estimating offset and skew of the slave clock.

    Abstract translation: 本发明涉及时间传递的方法和装置。 本发明特别适用于将从时钟对准主时钟并处理分组延迟变化。 在本发明的实施例中，从时钟使用由端对端透明时钟测量的停留时间来补偿由于消息传送延迟的变化而产生的时钟同步误差。 实施例提供了简单的线性近似技术和用于估计从时钟的偏移和偏移的基于卡尔曼滤波器的技术。

    METHOD AND DEVICES FOR TIME TRANSFER USING PEER-TO-PEER TRANSPARENT CLOCKS
    22.
    发明申请
    METHOD AND DEVICES FOR TIME TRANSFER USING PEER-TO-PEER TRANSPARENT CLOCKS 有权
    使用对等透明时钟传输时间的方法和装置

    公开(公告)号：US20160170439A1

    公开(公告)日：2016-06-16

    申请号：US14566951

    申请日：2014-12-11

    Applicant: Khalifa University of Science, Technology, and Research ,  British Telecommunications plc ,  Emirates Telecommunications Corporation

    Inventor： James Aweya

    IPC: G06F1/12 ,  H04L29/08

    CPC classification number: G06F1/12 ,  G06F1/10 ,  H04L69/28

    Abstract: This invention relates to methods and devices for time synchronization. The invention has particular application in the alignment of slave clocks to a master clock and in dealing with packet delay variation and dynamic asymmetries in the network links between them. In embodiments of the invention, the slave clock uses the peer link delay and residence times measured by peer-to-peer transparent clocks to compensate for clock synchronization errors that arise due to variability in message transfer delays. Embodiments provide a simple linear approximation technique and a Kalman filter-based technique for estimating offset and skew of the slave clock.

    Abstract translation: 本发明涉及时间同步的方法和装置。 本发明在从属时钟对主时钟和处理它们之间的网络链路中的分组延迟变化和动态不对称性方面具有特别的应用。 在本发明的实施例中，从时钟使用由对等透明时钟测量的对等链路延迟和驻留时间来补偿由于消息传送延迟的变化而产生的时钟同步错误。 实施例提供了简单的线性近似技术和用于估计从时钟的偏移和偏移的基于卡尔曼滤波器的技术。

    METHODS AND DEVICES FOR BIAS ESTIMATION AND CORRECTION
    23.
    发明申请
    METHODS AND DEVICES FOR BIAS ESTIMATION AND CORRECTION 有权
    用于偏差估计和校正的方法和装置

    公开(公告)号：US20160069676A1

    公开(公告)日：2016-03-10

    申请号：US14477191

    申请日：2014-09-04

    Applicant: Khalifa University of Science, Technology, and Research ,  British Telecommunications plc ,  Emirates Telecommunications Corporation

    Inventor： Nayef Alsindi ,  James Aweya ,  Zdenek Chaloupka

    IPC: G01B21/16 ,  G01S19/00

    CPC classification number: G01S19/00 ,  G01S5/0215 ,  G01S19/22

    Abstract: This invention relates to methods and devices for bias estimation and correction, particularly for time-of-arrival (TOA) based wireless geolocation systems. Multipath and non-line-of-sight (NLOS) biases can cause distance estimation errors in the range of tens-hundreds of meters and is particularly problematic in urban and indoor environments. The behaviour of the biases dynamically changes depending on the clutter and/or obstructions between the base station and the mobile device. Aspects of the present invention provide practical real-time bias estimation and correction techniques for TOA-based systems and are based on inferring and estimating the biases from dynamic time differential measurements. The techniques can operate in real-time and involve simple calculations.

    Abstract translation: 本发明涉及用于偏差估计和校正的方法和装置，特别是用于基于到达时间（TOA）的无线地理定位系统。 多路径和非视距（NLOS）偏差可能导致距离估计误差在数百米范围内，并且在城市和室内环境中尤其成问题。 偏移的动作根据基站和移动设备之间的杂波和/或障碍物动态地变化。 本发明的各方面为基于TOA的系统提供实用的实时偏差估计和校正技术，并且基于从动态时间差分测量推断和估计偏差。 这些技术可以实时操作，并且涉及简单的计算。

    Methods and systems for localization
    27.
    发明授权
    Methods and systems for localization 有权

    公开(公告)号：US10215837B1

    公开(公告)日：2019-02-26

    申请号：US15852086

    申请日：2017-12-22

    Applicant: Khalifa University of Science, Technology, and Research ,  British Telecommunications plc ,  Emirates Telecommunications Corporation

    Inventor： Delfin Y. Montuno ,  James Aweya

    IPC: G01S5/06 ,  G01S5/12 ,  H04W4/02 ,  H04W64/00

    Abstract: This invention relates to methods and systems for localization. It is particularly concerned with localization techniques based on time difference of arrival for wireless devices. Embodiments of the invention relate to techniques in which a transmitter transmits periodic distinguishable signals which are relayed upon receipt by the client whose location is sought in a form distinguishable from that of the transmitter. Signals from both the transmitter and the client are received by at least three signal receivers which generate a time difference of arrival based on the difference taken for a signal to reach the receiver directly and via the client. Further embodiments of the invention provide a phase detector in the receivers to determine the time difference of arrival between the signals.

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