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    Reliability metrics for parameter estimates which account for cumulative error
    1.
    发明授权
    Reliability metrics for parameter estimates which account for cumulative error 失效
    考虑到累积误差的参数估计的可靠性指标

    公开(公告)号：US07558534B2

    公开(公告)日：2009-07-07

    申请号：US10125182

    申请日：2002-04-17

    申请人： Jeremy Stein ,  Ivan Fernandez-Corbaton ,  Roland R. Rick ,  Messay Amerga

    发明人： Jeremy Stein ,  Ivan Fernandez-Corbaton ,  Roland R. Rick ,  Messay Amerga

    IPC分类号： H04B17/00 ,  H04M1/00

    CPC分类号： H04W64/00 ,  G01S5/0205 ,  G01S5/0215

    摘要： A method of producing a reliability metric for a parameter estimate derived from a signal using correlation analysis is described. The method begins by obtaining an indication of whether a non line of sight signal condition is present or likely and/or obtaining an indication of whether a multi-path signal condition is present or likely. Responsive to one or both of these indications, the method derives a reliability metric for the parameter estimate. In one embodiment, the parameter estimate is an estimate of time of arrival (TOA) of the signal, and the reliability metric is root mean square error (RMSE) of the time of arrival estimate. This embodiment obtains an indication of whether a non line of sight signal condition is present or likely based on a measure of the strength of the correlation function at the peak thereof. The measure of the strength of the correlation function at the peak thereof may be energy per chip divided by total received power (Ec/I0) or may simply be the raw energy of the correlation function at the peak. The RMSE metric which is computed in this embodiment varies inversely with the peak strength of the correlation function.

    摘要翻译： 描述了使用相关性分析来生成从信号导出的参数估计的可靠性度量的方法。 该方法通过获得视线信号条件是否存在或可能存在和/或获得多径信号状况是否存在或可能的指示开始。 响应于这些指示中的一个或两个，该方法导出参数估计的可靠性度量。 在一个实施例中，参数估计是信号的到达时间（TOA）的估计，可靠性度量是到达时间估计的均方根误差（RMSE）。 该实施例基于在其峰值处的相关函数的强度的度量来获得是否存在非线视觉信号条件或可能的指示。 峰值处的相关函数的强度的度量可以是每个芯片的能量除以总接收功率（Ec / I0），或者可以简单地是峰值处的相关函数的原始能量。 在本实施例中计算的RMSE度量与相关函数的峰值强度成反比变化。

    Position determination system that uses A cellular communication system
    2.
    发明授权
    Position determination system that uses A cellular communication system 有权
    使用蜂窝通信系统的位置确定系统

    公开(公告)号：US07877100B2

    公开(公告)日：2011-01-25

    申请号：US12482299

    申请日：2009-06-10

    申请人： Roland R. Rick ,  Ivan Fernandez-Corbaton ,  Jeremy M. Stein ,  Messay Amerga ,  Borislav Ristic ,  Ashok Bhatia

    发明人： Roland R. Rick ,  Ivan Fernandez-Corbaton ,  Jeremy M. Stein ,  Messay Amerga ,  Borislav Ristic ,  Ashok Bhatia

    IPC分类号： H04W24/00

    CPC分类号： H04W64/00 ,  G01S5/0257 ,  G01S19/48

    摘要： A position determination system and apparatus for utilizing a network of cellular base stations to determine position of a mobile station includes taking a plurality of statistically independent data measurements of the pilot signals from the base stations. Each of the data measurements includes an earliest time of arrival, providing multiple independent measurements for each of the pilot signals. For each cellular base station, a representative measurement is calculated responsive to the independent measurements, which is used to determine position of the mobile station using an AFLT algorithm and/or in conjunction with a GPS algorithm. In some embodiments, the data measurements for each pilot signal further include an RMSE estimate and time of measurement for each time of arrival, and an energy measurement for all resolvable paths. If the mobile station comprises a cell phone, a cell search list and a GPS search list may be provided by a cell base station.

    摘要翻译： 用于利用蜂窝基站的网络来确定移动站的位置的位置确定系统和装置包括对来自基站的导频信号进行多个统计上独立的数据测量。 每个数据测量包括最早的到达时间，为每个导频信号提供多个独立测量。 对于每个蜂窝基站，响应于使用AFLT算法和/或结合GPS算法来确定移动站的位置的独立测量来计算代表性测量。 在一些实施例中，每个导频信号的数据测量还包括对于每个到达时间的RMSE估计和测量时间以及针对所有可解析路径的能量测量。 如果移动站包括蜂窝电话，小区搜索列表和GPS搜索列表可以由小区基站提供。

    Position Determination System That Uses A Cellular Communication System
    4.
    发明申请
    Position Determination System That Uses A Cellular Communication System 有权
    使用蜂窝通信系统的位置确定系统

    公开(公告)号：US20090305726A1

    公开(公告)日：2009-12-10

    申请号：US12482299

    申请日：2009-06-10

    申请人： Roland R. Rick ,  Ivan Fernandez-Corbaton ,  Jeremy M. Stein ,  Messay Amerga ,  Borislav Ristic ,  Ashok Bhatia

    发明人： Roland R. Rick ,  Ivan Fernandez-Corbaton ,  Jeremy M. Stein ,  Messay Amerga ,  Borislav Ristic ,  Ashok Bhatia

    IPC分类号： H04W24/00 ,  G01S1/00

    CPC分类号： H04W64/00 ,  G01S5/0257 ,  G01S19/48

    摘要： A position determination system and apparatus for utilizing a network of cellular base stations to determine position of a mobile station includes taking a plurality of statistically independent data measurements of the pilot signals from the base stations. Each of the data measurements includes an earliest time of arrival, providing multiple independent measurements for each of the pilot signals. For each cellular base station, a representative measurement is calculated responsive to the independent measurements, which is used to determine position of the mobile station using an AFLT algorithm and/or in conjunction with a GPS algorithm. In some embodiments, the data measurements for each pilot signal further include an RMSE estimate and time of measurement for each time of arrival, and an energy measurement for all resolvable paths. If the mobile station comprises a cell phone, a cell search list and a GPS search list may be provided by a cell base station.

    摘要翻译： 用于利用蜂窝基站的网络来确定移动站的位置的位置确定系统和装置包括对来自基站的导频信号进行多个统计上独立的数据测量。 每个数据测量包括最早的到达时间，为每个导频信号提供多个独立测量。 对于每个蜂窝基站，响应于使用AFLT算法和/或结合GPS算法来确定移动站的位置的独立测量来计算代表性测量。 在一些实施例中，每个导频信号的数据测量还包括对于每个到达时间的RMSE估计和测量时间以及针对所有可解析路径的能量测量。 如果移动站包括蜂窝电话，小区搜索列表和GPS搜索列表可以由小区基站提供。

    Parameter estimator configured to distinguish between peaks and sidelobes of correlation function
    6.
    发明授权
    Parameter estimator configured to distinguish between peaks and sidelobes of correlation function 有权
    参数估计器被配置为区分相关函数的峰值和旁瓣

    公开(公告)号：US07308022B2

    公开(公告)日：2007-12-11

    申请号：US10060885

    申请日：2002-01-29

    申请人： Roland R. Rick ,  Messay Amerga ,  Jeremy M. Stein ,  Ivan Fernandez-Corbaton

    发明人： Roland R. Rick ,  Messay Amerga ,  Jeremy M. Stein ,  Ivan Fernandez-Corbaton

    IPC分类号： H04B1/00

    CPC分类号： G01S5/0215 ,  G01S5/0221 ,  G01S19/22 ,  H04B1/70755 ,  H04B1/7117

    摘要： A parameter estimator for estimating one or more parameter(s) from a signal is described. A correlation function is derived from the signal, and the correlation function analyzed to determine if one or more first peak(s) are present, and, if so, distinguishable from the sidelobe(s) of a second peak. If the one or more first peak(s) are present and distinguishable from the sidelobe(s) of the second peak, the one or more parameter(s) are estimated from the one or more first peak(s). If the one or more first peak(s) are not present, or, if present, are not distinguishable from the sidelobe(s) of the second peak, the one or more parameter(s) are estimated from the second peak. The parameter estimator may be employed in a subscriber station to estimate a parameter such as the time of arrival of one or more base station or sector pilot signals in a wireless communication system. This information may be utilized in an overall advanced forward link trilateration (AFLT) process for estimating the location of the subscriber station.

    摘要翻译： 描述了用于从信号估计一个或多个参数的参数估计器。 从信号中导出相关函数，分析相关函数以确定是否存在一个或多个第一峰，如果是，则与第二峰的旁瓣区分开。 如果一个或多个第一峰存在并且可与第二峰的旁瓣区分开，则从一个或多个第一峰估计一个或多个参数。 如果一个或多个第一峰不存在，或者如果存在，则不能与第二峰的旁瓣区分开，则从第二峰估计一个或多个参数。 可以在用户台中使用参数估计器来估计诸如无线通信系统中的一个或多个基站或扇区导频信号的到达时间的参数。 该信息可以用于用于估计用户台的位置的总体高级前向链路三边测量（AFLT）过程。

    System and method for wireless signal time of arrival
    9.
    发明授权
    System and method for wireless signal time of arrival 有权
    无线信号到达时间的系统和方法

    公开(公告)号：US07474994B2

    公开(公告)日：2009-01-06

    申请号：US10057441

    申请日：2002-01-25

    申请人： Ivan Fernandez-Corbaton ,  Jeremy Stein ,  Roland R. Rick

    发明人： Ivan Fernandez-Corbaton ,  Jeremy Stein ,  Roland R. Rick

    IPC分类号： G06F17/10

    CPC分类号： H04W64/00 ,  G01S5/02 ,  G01S5/0221

    摘要： A system and method for accurately determining time of arrival using a mathematical model that mimics a correlation function. A correlation value is sampled at a predetermined periodic interval and a maximum correlation value, coinciding with a particular point in time, is determined. The mathematical model uses the maximum measured correlation value and correlation values at adjacent sample points to determine coefficients for the selected mathematical model. The coefficients may be calculated and used to determine the actual peak, which may fall in-between the sample points. The actual peak value is used to accurately determine the time of arrival of a signal. Time of arrival signals from a plurality of remote transmitters are used along with conventional triangulation techniques to accurately determine the location of the wireless unit.

    摘要翻译： 使用模拟相关函数的数学模型来准确地确定到达时间的系统和方法。 以预定的周期性间隔对相关值进行采样，并且确定与特定时间点一致的最大相关值。 数学模型使用相邻采样点的最大测量相关值和相关值来确定所选数学模型的系数。 可以计算系数并用于确定可能落在采样点之间的实际峰值。 实际峰值用于准确确定信号的到达时间。 来自多个远程发射机的到达时间信号与传统的三角测量技术一起被使用以精确地确定无线单元的位置。

    System and method for the detection and compensation of radio signal time of arrival errors
    10.
    发明申请
    System and method for the detection and compensation of radio signal time of arrival errors 失效
    用于检测和补偿无线电信号到达时间错误的系统和方法

    公开(公告)号：US20050032477A1

    公开(公告)日：2005-02-10

    申请号：US10932511

    申请日：2004-09-01

    申请人： Ivan Fernandez-Corbaton ,  Roland Rick ,  Messay Amerga

    发明人： Ivan Fernandez-Corbaton ,  Roland Rick ,  Messay Amerga

    IPC分类号： G01S1/00 ,  G01S1/02 ,  G01S5/02 ,  G01S5/10 ,  G01S19/22 ,  G01S19/40 ,  G01S19/42 ,  G01S19/48 ,  H04B1/10 ,  H04B1/711 ,  H04B1/7117 ,  H04W24/00 ,  H04W28/04 ,  H04W84/06 ,  H04B15/00

    CPC分类号： G01S19/22 ,  G01S5/0215 ,  G01S5/0273 ,  G01S5/10 ,  G01S19/40 ,  G01S19/42 ,  G01S19/428 ,  G01S19/46 ,  H04B1/1081 ,  H04B1/711 ,  H04B1/7117 ,  H04W24/00 ,  H04W84/06

    摘要： A system and method are disclosed by which the effects of time of arrival errors may be reduced. In a mobile unit, such as a CDMA device, a correlation pulse is generated when a transmitted code matches a stored reference code. In the absence of multipath effects, correlation pulses are generated in response to the detection of multiple transmissions of the reference code from multiple transmitters. However, multipath effects distort the generated correlation pulses leading to errors in the time of arrival measurements. The present invention calculates the width of the correlation pulses and determines a delay correction factor based on the pulse width. The delay correction factor is added to the measured delay time to provide a more accurate delay time, thus permitting more accurate location measurements based on time of arrival. In alternative embodiments, other signal factors may also be used to apply delay correction factors. The actual location determination may be performed by the mobile unit, or any other positioning determining entity (PDE). The system is also capable of applying correction factors to time of arrival signals received from global positioning system (GPS) satellites.

    摘要翻译： 公开了一种可以减少到达时间错误的影响的系统和方法。 在诸如CDMA设备的移动单元中，当发送的码与存储的参考码匹配时，产生相关脉冲。 在没有多路径效应的情况下，响应于来自多个发射机的参考码的多次传输的检测而产生相关脉冲。 然而，多路径效应使所产生的相关脉冲失真导致到达时间测量的误差。 本发明计算相关脉冲的宽度，并且基于脉冲宽度确定延迟校正因子。 将延迟校正因子加到测量的延迟时间上，以提供更精确的延迟时间，从而根据到达时间进行更准确的位置测量。 在替代实施例中，也可以使用其他信号因子来应用延迟校正因子。 实际位置确定可以由移动单元或任何其他定位确定实体（PDE）执行。 该系统还能够对从全球定位系统（GPS）卫星接收的到达时间信号应用校正因子。