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    Position location of multiple transponding platforms and users using two-way ranging as a calibration reference for GPS
    2.
    发明授权
    Position location of multiple transponding platforms and users using two-way ranging as a calibration reference for GPS 有权
    使用双向测距作为GPS的校准参考的多个反应平台和用户的位置

    公开(公告)号：US06785553B2

    公开(公告)日：2004-08-31

    申请号：US09841110

    申请日：2001-04-24

    申请人： Donald C. D. Chang ,  Kar W. Yung ,  David C. Cheng ,  Ming U. Chang ,  Frank A. Hagen

    发明人： Donald C. D. Chang ,  Kar W. Yung ,  David C. Cheng ,  Ming U. Chang ,  Frank A. Hagen

    IPC分类号： H04Q720

    CPC分类号： G01S19/40 ,  G01S5/14 ,  G01S19/07 ,  G01S19/15 ,  H04B7/18504 ,  H04B7/18532 ,  H04B7/18534

    摘要： A method and system for using two-way ranging navigation to accurately determine the location of a transponder platform above-Earth or a fixed or mobile target on the ground or on water. The two-way ranging navigation measurements are used as calibration references, thereby improving the positioning accuracy of GPS. The system includes GPS and a two-way ranging navigation system for taking position measurements of a target. A correction factor is determined as a function of the measurements and the GPS position is adjusted by the correction factor. The method for calibrating GPS using two-way ranging navigation involves taking a two-way ranging navigation measurement and a GPS measurement of a target, determining a correction factor as a function of the measurements, and correcting the GPS position by taking a second GPS measurement and adjusting it by the correction factor.

    摘要翻译： 一种使用双向测距导航准确地确定地球上的应答器平台或地面或水上固定或移动目标的位置的方法和系统。 双向测距导航测量用作校准参考，从而提高GPS的定位精度。 该系统包括GPS和用于对目标进行位置测量的双向测距导航系统。 作为测量的函数确定校正因子，并且通过校正因子来调整GPS位置。 使用双向测距导航来校准GPS的方法包括进行目标的双向测距导航测量和GPS测量，确定作为测量的函数的校正因子，以及通过进行第二GPS测量来校正GPS位置 并通过校正因子进行调整。

    Techniques for utilization of bandwidth space assets
    3.
    发明授权
    Techniques for utilization of bandwidth space assets 有权
    利用带宽空间资产的技术

    公开(公告)号：US06606307B1

    公开(公告)日：2003-08-12

    申请号：US09432439

    申请日：1999-11-02

    申请人： Donald C. D. Chang ,  Kar W. Yung ,  David C. Cheng ,  Urban A. Von Der Embse ,  John I. Novak, III ,  Frank A. Taormina ,  Ming U. Chang

    发明人： Donald C. D. Chang ,  Kar W. Yung ,  David C. Cheng ,  Urban A. Von Der Embse ,  John I. Novak, III ,  Frank A. Taormina ,  Ming U. Chang

    IPC分类号： H04B7185

    CPC分类号： H04B7/18521

    摘要： Methods for operating a satellite constellation are disclosed that utilize spatial diversity and directional gain antennas at ground terminal locations to provide multiple data rate services on a single frequency channel. One method comprises receiving a signal at a first and second satellite in the satellite constellation from a first communications device. A communications channel at a first frequency from the first satellite is used to communicate with the first communications device. A signal from a second communications device is received only at the second satellite at the first frequency, and the second satellite is used to communicate with the second communications device at the first frequency without substantially interfering with the communications with the first communications device.

    摘要翻译： 公开了用于操作卫星星座的方法，其利用地面终端位置处的空间分集和方向增益天线在单个频率信道上提供多个数据速率业务。 一种方法包括从第一通信设备在卫星星座中的第一和第二卫星处接收信号。 来自第一卫星的第一频率的通信信道被用于与第一通信设备进行通信。 来自第二通信设备的信号仅在第一频率处在第二卫星处被接收，并且第二卫星被用于以第一频率与第二通信设备通信，而基本上不干扰与第一通信设备的通信。

    Method and system for determining a position of a transceiver in a communications network
    6.
    发明授权
    Method and system for determining a position of a transceiver in a communications network 有权

    公开(公告)号：US06313790B2

    公开(公告)日：2001-11-06

    申请号：US09780103

    申请日：2001-02-09

    申请人： Donald C. D. Chang ,  Kar W. Yung ,  William J. Nunan ,  David C. Cheng ,  Bruce E. Shuman

    发明人： Donald C. D. Chang ,  Kar W. Yung ,  William J. Nunan ,  David C. Cheng ,  Bruce E. Shuman

    IPC分类号： H04B7185

    CPC分类号： G01S5/14 ,  G01S5/12

    摘要： A method and system for determining a position of an orbiting transceiver in a communications network includes at least a first and second transceiver at a first and second known location, respectively, on Earth. The first and second transceivers are adapted to transmit and receive communications signals to and from the orbiting transceiver. A processor coupled to one of the first and second transceivers determines a first and second range measurement between each of the first and second transceivers and the orbiting transceiver, respectively, as well as corresponding first and second range rates representative of a time rate of change of the first and second range measurements. The processor then determines a circle of intersection representative of the set of possible positions for the orbiting transceiver based on the first range measurement and the first range rate wherein the circle of intersection includes a specific orientation in space, a specific radius and a center in a specific, three-dimensional position relative to the known position of the first transceiver. An angular position of the orbiting transceiver is then determined along the circle of intersection based on the known position of the second transceiver and the second range measurement. Finally, the position of the orbiting transceiver is determined based on the circle of intersection and the angular position.

    Method and system for incorporating two-way ranging navigation as a calibration reference for GPS
    9.
    发明授权
    Method and system for incorporating two-way ranging navigation as a calibration reference for GPS 有权
    用于将双向测距导航作为GPS的校准参考的方法和系统

    公开(公告)号：US06246363B1

    公开(公告)日：2001-06-12

    申请号：US09209062

    申请日：1998-12-10

    申请人： Kar W. Yung ,  David C. Cheng ,  Donald C. D. Chang

    发明人： Kar W. Yung ,  David C. Cheng ,  Donald C. D. Chang

    IPC分类号： H04B7185

    CPC分类号： G01S19/40 ,  G01S5/14 ,  G01S19/07 ,  G01S19/15

    摘要： A method and system for using two-way ranging navigation to accurately determine the range along the path from source to destination by measuring the time delay during round-trip communication via satellite. The two-way ranging navigation measurements are used as calibration references, thereby improving the positioning accuracy of GPS. The system includes GPS and a two-way ranging navigation system for taking position measurements of a target. A correction factor is determined as a function of the measurements and the GPS position is adjusted by the correction factor. The method for calibrating GPS using two-way ranging navigation involves taking a two-way ranging navigation measurement and a GPS measurement of a target, determining a correction factor as a function of the measurements, and correcting the GPS position by taking a second GPS measurement and adjusting it by the correction factor.

    摘要翻译： 一种使用双向测距导航的方法和系统，通过测量通过卫星的往返通信中的时间延迟来准确地确定从源到目的地的路径。 双向测距导航测量用作校准参考，从而提高GPS的定位精度。 该系统包括GPS和用于对目标进行位置测量的双向测距导航系统。 作为测量的函数确定校正因子，并且通过校正因子来调整GPS位置。 使用双向测距导航来校准GPS的方法包括进行目标的双向测距导航测量和GPS测量，确定作为测量的函数的校正因子，以及通过进行第二GPS测量来校正GPS位置 并通过校正因子进行调整。