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    System and method for creating accurate topographical maps using low-drift DGPS
    1.
    发明申请
    System and method for creating accurate topographical maps using low-drift DGPS 有权
    使用低漂移DGPS创建精确地形图的系统和方法

    公开(公告)号：US20050228585A1

    公开(公告)日：2005-10-13

    申请号：US10819743

    申请日：2004-04-07

    申请人： Terence Pickett ,  Frederick Nelson ,  Larry Hendrickson

    发明人： Terence Pickett ,  Frederick Nelson ,  Larry Hendrickson

    IPC分类号： G01C15/00 ,  G01S19/27 ,  G01C21/32

    CPC分类号： G01C15/00

    摘要： The present invention is directed to a method for acquiring elevation data for an area. The method includes using a GPS receiver to map ground elevations while driving back and forth over an area and periodically recording position, elevation, and time. Then, at least one track is made across the parallel tracks so that the cross track intersects the parallel tracks. The data obtained is processed and elevation data from the cross track is used to adjust elevation data for the parallel tracks, compensating for elevation drift in measurements recorded by the GPS receiver. The adjusted data for the entire area is processed using the method of the present invention to obtain an elevation map for the area.

    摘要翻译： 本发明涉及一种用于获取区域的高程数据的方法。 该方法包括使用GPS接收器来在地面上来回移动并周期性地记录位置，高程和时间时映射地面高度。 然后，跨越平行的轨道形成至少一个轨道，使得十字轨道与平行轨道相交。 所获得的数据被处理，并且使用来自交叉轨道的高程数据来调整平行轨道的高程数据，补偿由GPS接收机记录的测量中的高程漂移。 使用本发明的方法处理整个区域的调整数据，以获得该区域的高程图。

    Method for Increasing the Reliability of Position Information When Transitioning from a Regional, Wide-Area, or Global Carrier-Phase Differential Navigation (WADGPS) to a Local Real-Time Kinematic (RTK) Navigation System
    3.
    发明申请
    Method for Increasing the Reliability of Position Information When Transitioning from a Regional, Wide-Area, or Global Carrier-Phase Differential Navigation (WADGPS) to a Local Real-Time Kinematic (RTK) Navigation System 有权
    从区域，广域或全球载波相位差分导航（WADGPS）转换到本地实时运动（RTK）导航系统时提高位置信息可靠性的方法

    公开(公告)号：US20070085737A1

    公开(公告)日：2007-04-19

    申请号：US11457745

    申请日：2006-07-14

    申请人： Daniel Eslinger ,  Jing Sun ,  Richard Sharpe ,  Frederick Nelson ,  Terence Pickett ,  Ronald Hatch

    发明人： Daniel Eslinger ,  Jing Sun ,  Richard Sharpe ,  Frederick Nelson ,  Terence Pickett ,  Ronald Hatch

    IPC分类号： G01S5/14

    CPC分类号： G01S19/48 ,  G01S19/43 ,  G01S19/44

    摘要： The present invention includes a method for a combined use of a local positioning system, a local RTK system and a regional, wide-area, or global differential carrier-phase positioning system (WADGPS) in which disadvantages associated with the local positioning system, the RTK and the WADGPS navigation techniques when used separately are avoided. The method includes determining a first position of the object based on information from the WADGPS, and determining a second position of the object based on position information from a local positioning/RTK positioning system. Thereafter, position determined by the WADGPS and the position determined by the local positioning/RTK positioning system are compared. The WADGPS position is used for navigating the object when the WADGPS position and local positioning/position differ by more than a predefined threshold, and using the local positioning/RTK position for navigating the object when the WADGPS position and local positioning/RTK position differ by less than the predefined threshold.

    摘要翻译： 本发明包括一种组合使用本地定位系统，本地RTK系统和区域广域或全球差分载波相位定位系统（WADGPS）的方法，其中与本地定位系统相关的缺点 避免使用RTK和WADGPS导航技术。 该方法包括基于来自WADGPS的信息来确定对象的第一位置，并且基于来自本地定位/ RTK定位系统的位置信息确定对象的第二位置。 此后，比较由WADGPS确定的位置和由本地定位/ RTK定位系统确定的位置。 当WADGPS位置和本地定位/位置相差超过预定义阈值时，WADGPS位置用于导航对象，并且当WADGPS位置和本地定位/ RTK位置相差不同时使用本地定位/ RTK位置来导航对象 小于预定阈值。

    Method for combined use of local positioning system and a global positioning system
    6.
    发明申请
    Method for combined use of local positioning system and a global positioning system 有权
    组合使用本地定位系统和全球定位系统的方法

    公开(公告)号：US20050264444A1

    公开(公告)日：2005-12-01

    申请号：US11181410

    申请日：2005-07-13

    申请人： Richard Sharpe ,  Frederick Nelson ,  Terence Pickett ,  Ronald Hatch ,  Yang Yunchun

    发明人： Richard Sharpe ,  Frederick Nelson ,  Terence Pickett ,  Ronald Hatch ,  Yang Yunchun

    IPC分类号： G01S19/43 ,  G01S19/44 ,  G01S19/48 ,  G01S5/14

    CPC分类号： G01S19/44

    摘要： The present invention includes a method for a combined use of a local RTK system and a regional, wide-area, or global differential carrier-phase positioning system (WADGPS) in which disadvantages associated with the RTK and the WADGPS navigation techniques when used separately are avoided. The method includes using a known position of a user receiver that has been stationary or using an RTK system to initialize the floating ambiguity values in the WADGPS system when the user receiver is moving. Thereafter, the refraction-corrected carrier-phase measurements obtained at the user GPS receiver are adjusted by including the corresponding initial floating ambiguity values and the floating ambiguity values are treated as well known (small variance) in subsequent processes to position the user receiver in the WADGPS system.

    摘要翻译： 本发明包括一种组合使用本地RTK系统和区域，广域或全球差分载波相位定位系统（WADGPS）的方法，其中分别使用与RTK和WADGPS导航技术相关的缺点是 避免。 该方法包括当用户接收机正在移动时，使用固定的用户接收机的已知位置或使用RTK系统来初始化WADGPS系统中的浮动模糊度值。 此后，通过包括相应的初始浮点模糊度值来调整在用户GPS接收机处获得的经折射校正的载波相位测量值，并且在随后的处理中将浮动模糊度值视为已知（小的方差），以将用户接收机定位在 WADGPS系统。

    METHOD FOR COMBINED USE OF A LOCAL RTK SYSTEM AND A REGIONAL, WIDE-AREA, OR GLOBAL CARRIER-PHASE POSITIONING SYSTEM
    7.
    发明申请
    METHOD FOR COMBINED USE OF A LOCAL RTK SYSTEM AND A REGIONAL, WIDE-AREA, OR GLOBAL CARRIER-PHASE POSITIONING SYSTEM 有权
    组合使用本地RTK系统和区域，宽域或全球载波相位定位系统的方法

    公开(公告)号：US20050151683A1

    公开(公告)日：2005-07-14

    申请号：US10757340

    申请日：2004-01-13

    申请人： Richard Sharpe ,  Frederick Nelson ,  Terence Pickett ,  Ronald Hatch ,  Yunchun Yang

    发明人： Richard Sharpe ,  Frederick Nelson ,  Terence Pickett ,  Ronald Hatch ,  Yunchun Yang

    IPC分类号： G01S19/43 ,  G01S19/44 ,  G01S19/48 ,  H04B7/185 ,  G01S5/14

    CPC分类号： G01S19/44

    摘要： The present invention includes a method for a combined use of a local RTK system and a regional, wide-area, or global differential carrier-phase positioning system (WADGPS) in which disadvantages associated with the RTK and the WADGPS navigation techniques when used separately are avoided. The method includes using a known position of a user receiver that has been stationary or using an RTK system to initialize the floating ambiguity values in the WADGPS system when the user receiver is moving. Thereafter, the refraction-corrected carrier-phase measurements obtained at the user GPS receiver are adjusted by including the corresponding initial floating ambiguity values and the floating ambiguity values are treated as well known (small variance) in subsequent processes to position the user receiver in the WADGPS system.

    摘要翻译： 本发明包括一种组合使用本地RTK系统和区域，广域或全球差分载波相位定位系统（WADGPS）的方法，其中分别使用与RTK和WADGPS导航技术相关的缺点是 避免。 该方法包括当用户接收机正在移动时，使用固定的用户接收机的已知位置或使用RTK系统来初始化WADGPS系统中的浮动模糊度值。 此后，通过包括相应的初始浮点模糊度值来调整在用户GPS接收机处获得的经折射校正的载波相位测量值，并且在随后的处理中将浮动模糊度值视为已知（小的方差），以将用户接收机定位在 WADGPS系统。

    Automatic steering system
    8.
    发明申请
    Automatic steering system 有权
    自动转向系统

    公开(公告)号：US20060149446A1

    公开(公告)日：2006-07-06

    申请号：US11019482

    申请日：2004-12-21

    申请人： Frederick Nelson

    发明人： Frederick Nelson

    IPC分类号： B62D6/00

    CPC分类号： B62D1/286 ,  B62D1/02 ,  B62D5/04

    摘要： Structure for converting a conventional manual steering system of an off-road vehicle to an automatic steering system utilizing remote signals. A stepper motor is connected through a belt or chain drive to a drive mounted on the upper end of a steering shaft. The stepper motor is connected to a microprocessor and moves with the steering shaft in both a manual steering mode and an automatic steering mode. An encoder provides a signal to a microprocessor that changes operation to the manual mode if the number of steps reported by the encoder is different than what is expected. An assembly including alternate steering wheel, shaft pulley, adapter insert and stepper motor is easily connected to the steering column. A drive motor may also be directly connected to the steering shaft.

    摘要翻译： 用于将越野车辆的常规手动转向系统转换成利用远程信号的自动转向系统的结构。 步进电机通过皮带或链条驱动连接到安装在转向轴上端的驱动器。 步进电机连接到微处理器并随着转向轴在手动转向模式和自动转向模式下移动。 如果编码器报告的步数与预期的不同，则编码器向微处理器提供信号，从而将操作改变为手动模式。 包括可选方向盘，轴滑轮，适配器插入件和步进电机的组件可方便地连接到转向柱。 驱动马达也可以直接连接到转向轴。

    Method for generating clock corrections for a wide-area or global differential GPS system
    9.
    发明申请
    Method for generating clock corrections for a wide-area or global differential GPS system 失效
    用于为广域或全球差分GPS系统生成时钟校正的方法

    公开(公告)号：US20050024263A1

    公开(公告)日：2005-02-03

    申请号：US10630302

    申请日：2003-07-30

    申请人： Richard Sharpe ,  Ronald Hatch ,  Frederick Nelson

    发明人： Richard Sharpe ,  Ronald Hatch ,  Frederick Nelson

    IPC分类号： G01S5/14 ,  G01S19/07 ,  G01S19/41 ,  G01S19/48

    CPC分类号： G01S19/07 ,  G01S19/41

    摘要： A method for generating satellite clock corrections for a WADGPS network computers satellite clock corrections after removing other substantial error components. Errors caused by the ionosphere refraction effects are removed from GPS measurements taken at reference stations using dual-frequency GPS measurements. The multipath noise are removed by smoothing of GPS pseudorange code measurements with carrier-phase measurements. The tropospheric refraction effect can be largely removed by modeling, and if desired, can be improved by the use of small stochastic adjustments included in the computation of the clock correction. After removing the above error factors, satellite clock corrections are computed for individual reference stations, and an average clock correction is formed for each of a plurality of satellites by taking an average or weighted average of the satellite clock corrections over reference stations to which the satellite is visible.

    摘要翻译： 一种用于在删除其他实质性错误组件之后，为WADGPS网络计算机卫星时钟校正生成卫星时钟校正的方法。 由电离层折射效应导致的误差从使用双频GPS测量的参考站进行的GPS测量中消除。 通过用载波相位测量平滑GPS伪距码测量来消除多路径噪声。 可以通过建模大大地消除对流层折射效应，并且如果需要，可以通过使用包括在时钟校正的计算中的小随机调整来改善对流层折射效应。 在去除上述误差因素之后，针对各个参考站计算卫星时钟校正，并且通过在卫星的参考站上取卫星时钟校正的平均或加权平均值来为多个卫星中的每一个形成平均时钟校正，卫星 是可见的

    Method and appartus for accurate frequency synthesis using global positioning system timing information
    10.
    发明授权
    Method and appartus for accurate frequency synthesis using global positioning system timing information 失效
    使用全球定位系统定时信息进行精确频率合成的方法和程序

    公开(公告)号：US5717403A

    公开(公告)日：1998-02-10

    申请号：US524083

    申请日：1995-09-06

    申请人： Frederick Nelson ,  Richard Kai-Tuen Woo ,  Ronald R. Hatch

    发明人： Frederick Nelson ,  Richard Kai-Tuen Woo ,  Ronald R. Hatch

    IPC分类号： G01S1/00 ,  H03L7/00 ,  G01S5/02

    CPC分类号： H03L7/00

    摘要： A method and apparatus for synthesizing a stable reference signal of a desired frequency within a spread spectrum receiver is disclosed herein. The spread spectrum receiver is designed for use in conjunction with a global positioning system (GPS) receiver, and operates to receive broadcast differential GPS correction information. The present frequency synthesis technique contemplates generating a sequence of timing signals within the GPS receiver on the basis of GPS satellite signals received thereby, and providing the timing signals to the signal receiver. Within the signal receiver, the signal cycles of a local oscillator occurring between ones of the timing signals are counted. The frequency of the local oscillator is then determined by dividing the counted cycles of the local oscillator by one of the known time intervals. The determined frequency of output signals produced by the local oscillator is then scaled so as necessary to produce the reference signal of desired frequency. This allows precisely controlled reference frequencies to be obtained irrespective of the existence of frequency instability within the local oscillator. In a preferred implementation, the stable reference signals are employed during acquisition of differential GPS correction signals received by the spread spectrum receiver. In particular, the desired reference frequency is incrementally adjusted during the process of searching for and acquiring the exact frequency of the incident differential GPS correction signals. The spread spectrum receiver is disposed to provide differential GPS correction information extracted from the acquired differential GPS correction signals to the GPS receiver.

    摘要翻译： 本文公开了一种用于在扩频接收机内合成所需频率的稳定参考信号的方法和装置。 扩频接收机被设计为与全球定位系统（GPS）接收机一起使用，并且操作以接收广播差分GPS校正信息。 本频率合成技术考虑根据由此接收的GPS卫星信号，在GPS接收机内产生定时信号序列，并向定时信号提供信号。 在信号接收器内，对定时信号之间发生的本地振荡器的信号周期进行计数。 然后通过将本地振荡器的计数周期除以已知时间间隔之一来确定本地振荡器的频率。 然后对本地振荡器产生的输出信号的确定频率进行缩放，以便产生所需频率的参考信号。 这允许获得精确控制的参考频率，而不管本地振荡器内是否存在频率不稳定性。 在优选实施例中，在采集由扩频接收机接收的差分GPS校正信号的采集期间采用稳定的参考信号。 特别地，在搜索和获取入射差分GPS校正信号的确切频率的过程中，期望的参考频率被递增地调整。 扩频接收机被设置为提供从所获取的差分GPS校正信号中提取到GPS接收机的差分GPS校正信息。