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    Location identification using broadcast wireless signal signatures
    1.
    发明申请
    Location identification using broadcast wireless signal signatures 有权
    使用广播无线信号签名的位置识别

    公开(公告)号：US20070050824A1

    公开(公告)日：2007-03-01

    申请号：US11284800

    申请日：2005-11-22

    申请人： Andy Lee ,  James Spilker ,  Matthew Rabinowitz ,  Jimmy Omura

    发明人： Andy Lee ,  James Spilker ,  Matthew Rabinowitz ,  Jimmy Omura

    IPC分类号： H04N7/18 ,  H04N7/16

    CPC分类号： G01S5/0252 ,  H04H60/51 ,  H04W64/00

    摘要： An apparatus having a corresponding computer program comprises a receiver to receive one or more wireless signals; and a measurement circuit to obtain measurements of one or more characteristics of each of the wireless signals; wherein one or more of a plurality of possible locations of the apparatus are selected based on the measurements and a plurality of associations each associating one of the possible locations with expected values for the measurements for the one of the possible locations.

    摘要翻译： 具有对应的计算机程序的装置包括：接收器，用于接收一个或多个无线信号; 以及测量电路，用于获得每个所述无线信号的一个或多个特性的测量值; 其中基于所述测量和多个关联来选择所述装置的多个可能位置中的一个或多个，每个关联将所述可能位置中的一个与所述可能位置之一的所述测量值的预期值相关联。

    Rapid acquisition and correlation of synchronization codes for mobile devices with limited memory and computational power
    3.
    发明申请
    Rapid acquisition and correlation of synchronization codes for mobile devices with limited memory and computational power 失效
    有限的存储器和计算能力的移动设备的同步码的快速采集和相关性

    公开(公告)号：US20060061691A1

    公开(公告)日：2006-03-23

    申请号：US10946070

    申请日：2004-09-22

    申请人： Matthew Rabinowitz ,  Michael Sabin ,  Jimmy Omura

    发明人： Matthew Rabinowitz ,  Michael Sabin ,  Jimmy Omura

    IPC分类号： H04N7/16 ,  H04N7/18 ,  H04N7/173 ,  H04N5/21 ,  H04N9/64

    CPC分类号： H04H60/51 ,  G01S5/0221 ,  G01S5/14 ,  G01S5/145 ,  G01S19/09 ,  G01S19/31 ,  G01S19/46 ,  H04N5/211 ,  H04N5/4401 ,  H04N5/4446 ,  H04N5/455 ,  H04N21/25841 ,  H04N21/41407 ,  H04N21/435 ,  H04N21/4382 ,  H04N21/6112 ,  H04N21/6181 ,  H04N21/654 ,  H04N21/658

    摘要： The present invention provides a method, system, and apparatus for rapidly acquiring and correlating synchronization codes for a mobile receiver used for position determination purposes. The receiver uses a processing unit to perform the correlation functions. The processing unit first computes, for each segment interval of the received signal, the phase offset of that interval. Each interval is appropriately adjusted to account for the computed phase offset. The processing unit then accumulates the phase-adjusted segment intervals, and may down-convert the accumulated signal to a baseband format from an intermediate frequency. The processing unit then correlates the accumulated signal with a reference signal to produce a correlation peak, from which the time delay of a synchronization code within the interval can be calculated. Ultimately, the receiver's position can be determined based on the calculated time delay.

    摘要翻译： 本发明提供一种用于快速获取和关联用于位置确定目的的移动接收机的同步码的方法，系统和装置。 接收机使用处理单元执行相关功能。 对于接收信号的每个段间隔，处理单元首先计算该间隔的相位偏移。 适当调整每个间隔以计算相位偏移。 处理单元然后累积相位调整的段间隔，并且可以将累积信号从中频降频转换为基带格式。 然后，处理单元将累加的信号与参考信号相关联，以产生相关峰值，从而可以计算间隔内的同步码的时间延迟。 最终，接收机的位置可以基于计算的时间延迟来确定。

    Pilot acquisition and local clock calibration with reduced MIPS
    5.
    发明申请
    Pilot acquisition and local clock calibration with reduced MIPS 审中-公开
    导频采集和本地时钟校准，减少了MIPS

    公开(公告)号：US20060064725A1

    公开(公告)日：2006-03-23

    申请号：US10945878

    申请日：2004-09-22

    申请人： Matthew Rabinowitz ,  Michael Sabin ,  Jimmy Omura

    发明人： Matthew Rabinowitz ,  Michael Sabin ,  Jimmy Omura

    IPC分类号： H04N7/20

    CPC分类号： G01S19/46 ,  G01S5/0036 ,  G01S19/25

    摘要： The present invention provides a method, system, and apparatus for estimating a pilot frequency of a television broadcast signal at a receiver. In one aspect, the receiver constitutes a mobile device that uses the estimated pilot frequency to facilitate the determination of position location of the mobile device. The receiver includes a processor which estimates the pilot frequency by computing a baseband version of the pilot signal relative to a reference frequency, defining time-shifted segments for the pilot signal and its baseband version, computing phase correction terms using the pilot signal and its baseband version, phase correcting each received signal segment, and estimating the pilot frequency. In another aspect of the invention, a phase-locked-loop is used to track the phase of the incoming pilot signal. The loop filter and/or the phase of the numerically controlled oscillator is scaled to account for the non-integer nature of samples within the received segments.

    摘要翻译： 本发明提供了一种在接收机处估计电视广播信号的导频的方法，系统和装置。 在一个方面，接收机构成使用所估计的导频频率以便于确定移动设备的位置位置的移动设备。 接收机包括处理器，其通过相对于参考频率计算导频信号的基带版本来估计导频频率，为导频信号及其基带版本定义时移段，使用导频信号和其基带计算相位校正项 版本，相位校正每个接收的信号段，并估计导频。 在本发明的另一方面，锁相环用于跟踪输入导频信号的相位。 数字控制振荡器的环路滤波器和/或相位被缩放以考虑接收段内的采样的非整数特性。