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    METHOD AND APPARATUS FOR PROVIDING ACCURATE POSITION ESTIMATES IN INSTANCES OF SEVERE DILUTION OF PRECISION
    2.
    发明公开
    METHOD AND APPARATUS FOR PROVIDING ACCURATE POSITION ESTIMATES IN INSTANCES OF SEVERE DILUTION OF PRECISION 有权
    方法和设备进行位置准确评估FALL强“精度因子”

    公开(公告)号：EP1399756A2

    公开(公告)日：2004-03-24

    申请号：EP02737535.1

    申请日：2002-06-17

    申请人： QUALCOMM INCORPORATED

    发明人： VAYANOS, Alkinoos, H.

    IPC分类号： G01S5/14

    CPC分类号： G01S5/14 ,  G01S19/46 ,  G01S19/48

    摘要： Techniques for providing an improved position estimate for a device in instances of relatively large dilution of precision. In a method, position estimates for a number of transmitters (e.g., GPS satellites and/or base stations) and a set of initial measurements (e.g., pseudo-ranges) are initially received. An Update Vector for a current device position estimate is computed. Non-convergence of the current device position estimate toward a target position estimate is detected and, if true, the Update Vector is adjusted (e.g., reduced in magnitude by a scaling factor) to increase the likelihood of convergence to the target position estimate. The current device position estimate is then updated based on the (possibly adjusted) Update Vector. Non-convergence may be detec ted based on the number of iterations performed without reaching the target position estimate and/or phase reversal in two consecutive Update Vectors. The scaling factor may be increased with each detected event indicative of non-convergence.

    METHOD AND APPARATUS FOR ESTIMATING VELOCITY OF A TERMINAL IN A WIRELESS COMMUNICATION SYSTEM
    3.
    发明公开
    METHOD AND APPARATUS FOR ESTIMATING VELOCITY OF A TERMINAL IN A WIRELESS COMMUNICATION SYSTEM 有权
    方法和设备，用于估计终端的速度在无线通信系统

    公开(公告)号：EP1328823A2

    公开(公告)日：2003-07-23

    申请号：EP01993329.0

    申请日：2001-10-29

    申请人： QUALCOMM INCORPORATED

    发明人： VAYANOS, Alkinoos, H.

    IPC分类号： G01S11/10 ,  G01S5/14

    CPC分类号： G01S19/52 ,  G01S11/10 ,  G01S2013/466

    摘要： Techniques to estimate the velocity of a terminal in a wireless communication system. Movement by the terminal results in a Doppler shift in the frequency of each transmitted signal received at the terminal. In one method, the positions of the terminal, a base station, and each of two or more satellites are initially determined. A residual rate of a change of pseudo-range may also be determined for each satellite, e.g., based on (1) an estimated baseband frequency error that includes the Doppler frequency shift due to the terminal's movement and (2) an estimated Doppler frequency shift due to movement by the satellite. A set of equations is then formed based on the determined positions of the terminal, the base station, and the satellites and the determined residual rates of change of pseudo-ranges for the satellites. The velocity of the terminal may thereafter be estimated based on the set of equations.

    METHOD AND APPARATUS FOR PROVIDING ACCURATE POSITION ESTIMATES IN INSTANCES OF SEVERE DILUTION OF PRECISION
    7.
    发明授权
    METHOD AND APPARATUS FOR PROVIDING ACCURATE POSITION ESTIMATES IN INSTANCES OF SEVERE DILUTION OF PRECISION 有权
    方法和设备进行位置准确评估FALL强“精度因子”

    公开(公告)号：EP1399756B1

    公开(公告)日：2012-05-30

    申请号：EP02737535.1

    申请日：2002-06-17

    申请人： QUALCOMM INCORPORATED

    发明人： VAYANOS, Alkinoos, H.

    IPC分类号： G01S19/46 ,  G01S5/14 ,  G01S19/48

    CPC分类号： G01S5/14 ,  G01S19/46 ,  G01S19/48

    摘要： Techniques for providing an improved position estimate for a device in instances of relatively large dilution of precision. In a method, position estimates for a number of transmitters (e.g., GPS satellites and/or base stations) and a set of initial measurements (e.g., pseudo-ranges) are initially received. An Update Vector for a current device position estimate is computed. Non-convergence of the current device position estimate toward a target position estimate is detected and, if true, the Update Vector is adjusted (e.g., reduced in magnitude by a scaling factor) to increase the likelihood of convergence to the target position estimate. The current device position estimate is then updated based on the (possibly adjusted) Update Vector. Non-convergence may be detec ted based on the number of iterations performed without reaching the target position estimate and/or phase reversal in two consecutive Update Vectors. The scaling factor may be increased with each detected event indicative of non-convergence.