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    • 3. 发明授权
    • Wireless local area network (WLAN) channel radio-frequency identification (RFID) tag system and method therefor
    • 无线局域网(WLAN)信道射频识别(RFID)标签系统及其方法
    • US06963289B2
    • 2005-11-08
    • US10274698
    • 2002-10-18
    • Daniel AljadeffYair GranotShalom TsruyaReuven Amsalem
    • Daniel AljadeffYair GranotShalom TsruyaReuven Amsalem
    • G01S5/06G01S13/76G01S13/87G08B5/22G01S13/08H04Q5/22
    • G01S5/06G01S13/765G01S13/878
    • A wireless local area network (WLAN) radio-frequency identification (RFID) tag system provides location finding in a wireless local area network (WLAN), using a WLAN channel. Interference with the WLAN is prevented by either using a sniffer circuit to determine that no network transmission is in progress, using a modified coding sequence or preamble to cause standard WLAN receivers to ignore the RFID tag transmissions, or transmitting a message using a standard WLAN signal addressed to an address not corresponding to a unit within the WLAN. Location units (LUs) and a master unit (MU) within the WLAN receive the RFID tag transmissions and can determine the location of a tag by triangulation based on differences between the signals received at the location units from the tag. The master unit receives the signal information from the location units and computes the location of the tag. Time-difference-of-Arrival (TDOA), received signal strength indication (RSSI) or other triangulation techniques may be used.
    • 无线局域网(WLAN)射频识别(RFID)标签系统使用WLAN信道在无线局域网(WLAN)中提供定位。 通过使用嗅探器电路来确定没有网络传输正在进行中,使用修改的编码序列或前导码来防止WLAN的干扰,以使标准WLAN接收机忽略RFID标签传输,或者使用标准WLAN信号发送消息 寻址到不对应于WLAN内的单元的地址。 WLAN内的位置单元(LU)和主单元(MU)接收RFID标签传输,并且可以基于在标签的位置单元处接收的信号之间的差异通过三角测量来确定标签的位置。 主单元从位置单元接收信号信息并计算标签的位置。 可以使用到达时差(TDOA),接收信号强度指示(RSSI)或其他三角测量技术。
    • 4. 发明授权
    • Method and system for synchronizing location finding measurements in a wireless local area network
    • 用于在无线局域网中同步位置测量测量的方法和系统
    • US06968194B2
    • 2005-11-22
    • US10677440
    • 2003-10-02
    • Daniel AljadeffYair Granot
    • Daniel AljadeffYair Granot
    • G01S5/06H04L12/28H04W64/00H04Q7/20
    • H04W64/00G01S5/021G01S5/06
    • A method and system for synchronizing location finding measurements in a wireless local area network (WLAN) provides a low cost mechanism for correcting location measurements within a WLAN location finding system. Multiple location receivers compute the time-of-arrival (TOA) of a reference transmitter signal, which is generally a beacon signal. The TOAs are collected and reported to a master unit that contains stored predetermined position information for the location receivers. The master unit computes the time-differences-of-arrival (TDOA) between multiple receivers and computes differences between the measured TDOAs and theoretical TDOAs computed in conformity with the predetermined position of each location receiver. The deviations between theoretical and measured TDOAs are collected in a statistical sample set and Kalman filters are used to produce a model of location receiver timebase offset and drift over multiple received beacon signals. The filter outputs are used to then either correct subsequent TDOA measurements for each location receiver, improving the accuracy of subsequent and/or prior TDOA measurements, or commands are sent to the location receivers to calibrate the timebases within the location receivers in order to improve the accuracy of subsequent TOA measurements.
    • 用于在无线局域网(WLAN)中同步位置测量测量的方法和系统提供了用于校正WLAN位置查找系统内的位置测量的低成本机制。 多位置接收器计算参考发射机信号的到达时间(TOA),其通常是信标信号。 TOA被收集并报告给包含存储的用于位置接收器的预定位置信息的主单元。 主单元计算多个接收机之间的时差(TDOA),并计算测量的TDOA与根据每个位置接收机的预定位置计算的理论TDOA之间的差异。 在统计采样集中收集理论和测量的TDOA之间的偏差,并且使用卡尔曼滤波器来产生位置接收机时基偏移和漂移在多个接收的信标信号上的模型。 滤波器输出用于随后校正每个位置接收器的后续TDOA测量值,提高随后和/或之前的TDOA测量的精度,或者将命令发送到位置接收器,以校准位置接收器内的时间基,以改善 随后的TOA测量的精度。