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8 条记录 (耗时 0.017 秒)

    METHODS AND DEVICES FOR BIAS ESTIMATION AND CORRECTION
    5.
    发明公开
    METHODS AND DEVICES FOR BIAS ESTIMATION AND CORRECTION 审中-公开
    用于偏差估计和校正的方法和装置

    公开(公告)号：EP3189347A1

    公开(公告)日：2017-07-12

    申请号：EP14766519.4

    申请日：2014-09-04

    申请人： Khalifa University of Science, Technology and Research ,  British Telecommunications Public Limited Company ,  Emirates Telecommunications Corporation

    发明人： ALSINDI, Nayef ,  AWEYA, James ,  CHALOUPKA, Zdenek

    IPC分类号： G01S5/02 ,  G01S5/14 ,  G01S13/76

    CPC分类号： G01S5/0273 ,  G01S5/14 ,  G01S13/767

    摘要： 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

    摘要翻译： 本发明涉及用于偏差估计和校正的方法和设备，特别是用于到达时间（TOA）的无线地理定位系统。 多路径和非视距（NLOS）偏差会导致数百米范围内的距离估计误差，并且在城市和室内环境中尤其成问题。 偏差的行为根据基站和移动设备之间的杂波和/或障碍而动态地改变。 本发明的各方面提供了用于基于TOA的系统的实际实时偏差估计和校正技术，并且基于推断和估计来自动态时间差分测量的偏差。 该

    METHOD AND DEVICES FOR COMPENSATING FOR PATH ASYMMETRY
    7.
    发明公开
    METHOD AND DEVICES FOR COMPENSATING FOR PATH ASYMMETRY 审中-公开
    方法用于补偿WEGASYMMETRIE DEVICES

    公开(公告)号：EP3053289A1

    公开(公告)日：2016-08-10

    申请号：EP13779333.7

    申请日：2013-10-02

    申请人： Khalifa University of Science, Technology and Research ,  British Telecommunications PLC ,  Emirates Telecommunications Corporation

    发明人： AWEYA, James ,  CHALOUPKA, Zdenek

    IPC分类号： H04J3/06

    摘要： This invention relates to methods and devices for compensating for path asymmetry, particularly with reference to time and frequency synchronization. The invention has particular application where time and frequency synchronization over packet networks using, for example, the IEEE 1588 Precision Time Protocol (PTP) is being carried out. Typically communication path delays between a time server (master) and a client (slave) are estimated using the assumption that the forward delay on the path is the same as the reverse delay. As a result, differences between these delays (delay asymmetries) can cause errors in the estimation of the offset of the slave clock from that of the master. Embodiments of the invention provide techniques and devices for compensating for path delay asymmetries that arise when timing protocol messages experience dissimilar queuing delays in the forward and reverse paths.

    METHOD AND DEVICES FOR PACKET SELECTION
    8.
    发明公开
    METHOD AND DEVICES FOR PACKET SELECTION 审中-公开
    包装选拔程序和DEVICES

    公开(公告)号：EP3080951A1

    公开(公告)日：2016-10-19

    申请号：EP13815105.5

    申请日：2013-12-09

    申请人： Khalifa University of Science, Technology and Research ,  British Telecommunications PLC ,  Emirates Telecommunications Corporation

    发明人： CHALOUPKA, Zdenek ,  AWEYA, James

    IPC分类号： H04L12/26 ,  H04J3/06

    摘要： This invention relates to packet selection techniques that can be used in conjunction with a clock recovery mechanism to mitigate the effects of packet delay variation on timing messages exchanged over a packet network, particularly when seeking to synchronize the time of a clock in a slave device to that of a master clock. The packet selection techniques can assist in reducing the noise in the recovered clock signal at the slave device, allowing recovery to a higher quality. Embodiments of the invention provide techniques based on extracting timing packets that create a constant interval between the arrival of selected packets at the slave device and on extracting timing packets which are closest to making the interval between arrival of the selected packets equal to the interval between the departure of the packets.