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    • 4. 发明授权
    • System and method for performing time difference of arrival location without requiring a common time base or clock calibration
    • 用于执行到达位置的时差的系统和方法,而不需要公共时基或时钟校准
    • US07609207B2
    • 2009-10-27
    • US12345706
    • 2008-12-30
    • Daniel Lyons
    • Daniel Lyons
    • G01S1/24G01S3/02
    • G01S5/06G01S5/021
    • A method for performing Time Difference Of Arrival (TDOA) that eliminates the need for a common time base or clock calibration and a system for implementing the method. The method relies on a packet transmitted from a reference wireless device (first wireless device) with a known propagation delay between the first wireless device and a second device, which serves as a common reference point for all TDOA estimates. When a packet is received from a wireless device by the first wireless device and the second wireless device, the time difference of arrival is computed based on when the signal was received by the first device and the second device, using the known propagation delay to compensate for differences in clocks and frequencies between the first wireless device and the second wireless device.
    • 用于执行到达时差(TDOA)的方法,其消除了对公共时基或时钟校准的需要以及用于实现该方法的系统。 该方法依赖于从第一无线设备和第二设备之间具有已知传播延迟的参考无线设备(第一无线设备)发送的分组,其用作所有TDOA估计的公共参考点。 当通过第一无线设备和第二无线设备从无线设备接收到分组时,基于第一设备和第二设备何时接收到信号,使用已知的传播延迟来补偿到达时间差 用于第一无线设备和第二无线设备之间的时钟和频率的差异。