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    GPS receiver tracking system
    2.
    发明授权
    GPS receiver tracking system 有权
    GPS接收机跟踪系统

    公开(公告)号：US06934630B2

    公开(公告)日：2005-08-23

    申请号：US10415541

    申请日：2001-12-12

    申请人： Lloyd A. Linstrom ,  Dennis J. Duven

    发明人： Lloyd A. Linstrom ,  Dennis J. Duven

    IPC分类号： G01S1/00 ,  G01S5/00 ,  G01S19/09 ,  G01S19/11 ,  G01S19/18 ,  G01S19/30 ,  G01C21/26

    CPC分类号： G01S19/18 ,  G01S5/0036 ,  G01S19/09 ,  G01S19/30

    摘要： A receiving station tracking system for receiving GPS data and tracking a mobile vehicle. The receiving station tracking system includes at least one processing stage receiving and processing at least a portion of the GPS data, and a control module receiving and filtering the processed GPS data and outputting at least one control signal in accordance with filtering results. The at least one control signal controls decreasing or increasing a quantity of processing stages of the at least one processing stage.

    摘要翻译： 一种用于接收GPS数据并跟踪移动车辆的接收站跟踪系统。 接收站跟踪系统包括至少一个处理级，其接收和处理GPS数据的至少一部分，以及控制模块，接收和过滤处理的GPS数据，并根据过滤结果输出至少一个控制信号。 所述至少一个控制信号控制减少或增加所述至少一个处理级的处理级的数量。

    Ensemble oscillator and related methods
    4.
    发明授权
    Ensemble oscillator and related methods 失效
    组合振荡器及相关方法

    公开(公告)号：US07317361B2

    公开(公告)日：2008-01-08

    申请号：US10898417

    申请日：2004-07-23

    申请人： Dennis J. Duven ,  Joseph J. Suter ,  Bruce G. Montgomery

    发明人： Dennis J. Duven ,  Joseph J. Suter ,  Bruce G. Montgomery

    IPC分类号： H03L7/085

    CPC分类号： G06F1/14 ,  G04G7/00

    摘要： An ensemble clock comprises: an input for receiving a reference signal; multiple free-running oscillators each configured to generate a corresponding free-running frequency; an output oscillator configured to generate a controlled frequency having a frequency responsive to a control signal; a differencer unit configured to derive difference measurements indicative of time and frequency-based errors associated with each of (i) the controlled frequency, and (ii) the free-running frequency, relative to the reference signal; and a controller configured to generate the control signal responsive to the difference measurements.

    摘要翻译： 集合时钟包括：用于接收参考信号的输入; 多个自由运行的振荡器被配置为产生相应的自由运行频率; 输出振荡器，被配置为产生具有响应于控制信号的频率的受控频率; 差分单元，被配置为导出指示与（i）受控频率中的每一个相关联的基于时间和频率的误差的差异度量，以及（ii）相对于参考信号的自由运行频率; 以及控制器，被配置为响应差值测量产生控制信号。

    Adaptive Kalman Filter process for controlling an ensemble clock
    5.
    发明授权
    Adaptive Kalman Filter process for controlling an ensemble clock 失效
    用于控制整体时钟的自适应卡尔曼滤波过程

    公开(公告)号：US06958951B2

    公开(公告)日：2005-10-25

    申请号：US10898418

    申请日：2004-07-23

    申请人： Dennis J. Duven

    发明人： Dennis J. Duven

    IPC分类号： G04B47/00 ,  G04C11/00 ,  G04F5/00 ,  G04G7/00 ,  G06F1/14 ,  G06F15/00 ,  H03B1/00 ,  H03L7/00 ,  H04N9/80

    CPC分类号： G06F1/14 ,  G04G7/00

    摘要： In an ensemble oscillator system including multiple free-running oscillators, a voltage controlled oscillator having a frequency responsive to a control signal, and a differencer unit that measures time differences between the oscillators, an adaptive Kalman Filter Processor (AKFP) generates the control signal responsive to the time differences. The AKFP uses oscillator noise models to model noise/errors of the ensemble system oscillators, including random noise parameters, and adaptively estimates the errors and the random noise parameters to derive the control signal.

    摘要翻译： 在包括多个自由运行振荡器的集成振荡器系统中，具有响应于控制信号的频率的压控振荡器和测量振荡器之间的时间差的差分单元，自适应卡尔曼滤波处理器（AKFP）产生响应 到时间差异。 AKFP使用振荡器噪声模型来模拟系统振荡器的噪声/误差，包括随机噪声参数，并自适应地估计误差和随机噪声参数以导出控制信号。

    Weak signal and anti-jamming Global Positioning System receiver and method using full correlation grid
    6.
    发明授权
    Weak signal and anti-jamming Global Positioning System receiver and method using full correlation grid 有权
    弱信号和抗干扰全球定位系统接收机和采用全相关网格的方法

    公开(公告)号：US06724343B2

    公开(公告)日：2004-04-20

    申请号：US10422544

    申请日：2003-04-24

    申请人： Mark S. Asher ,  Lloyd A. Linstrom ,  Robert L. Henderson ,  Dennis J. Duven

    发明人： Mark S. Asher ,  Lloyd A. Linstrom ,  Robert L. Henderson ,  Dennis J. Duven

    IPC分类号： B01S514

    CPC分类号： G01S19/21 ,  G01S19/24 ,  G01S19/26

    摘要： Disclosed is a system and method for increasing the weak signal recovery capability of a Global Positioning System (GPS) receiver correlating each of the plurality of digital signals by multiplying the I and Q phases by the carrier and code, adding a location offset, accumulating the results of the correlation, and latching the results until a predetermined time; coherent combining the accumulated results at the predetermined time; non-coherent combining the coherent combined results for a time period sufficient to raise a correlation peak to a predetermined point above a noise floor to produce a plurality of non-coherent bin observables; determining a maximum value of the plurality of bin observables and comparing the maximum value to predetermined threshold; determining grid locations of bin observables having maximum values greater than the predetermined threshold; determining a bi-quadratic surface using the grid locations; determining an argument maximum of the bi-quadratic surface; estimating epoch pseudorange and Doppler variables based on the argument maximum; estimating errors in at least one of position, velocity, orientation, user clock, frequency, and ionosphere states on the estimated epoch pseudorange and Doppler variables; and determining at least one of position, velocity and orientation by correcting for the estimated errors.

    摘要翻译： 公开了一种用于增加全球定位系统（GPS）接收机的弱信号恢复能力的系统和方法，其通过将I和Q相位与载波和码相乘来相加多个数字信号中的每一个，添加位置偏移量， 相关的结果，并将结果锁定到预定时间; 在预定时间内相加组合累积结果; 将相干组合结果的非相干组合足够的时间段以将相关峰值提高到噪声本底以上的预定点，以产生多个非相干二叉管可观察值; 确定所述多个箱可观测值的最大值，并将所述最大值与预定阈值进行比较; 确定具有大于所述预定阈值的最大值的二进制可观察值的网格位置; 使用所述网格位置确定二次曲面; 确定双二次曲面的参数最大值; 基于参数最大值估计时代伪距和多普勒变量; 在估计的时代伪距和多普勒变量上估计位置，速度，方向，用户时钟，频率和电离层状态中的至少一个中的误差; 以及通过校正估计的误差来确定位置，速度和方向中的至少一个。