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17 条记录 (耗时 0.021 秒)

    Method and apparatus for cross polarized isolation in a communication system
    11.
    发明授权
    Method and apparatus for cross polarized isolation in a communication system 有权
    通信系统中交叉极化隔离的方法和装置

    公开(公告)号：US06339611B1

    公开(公告)日：2002-01-15

    申请号：US09435941

    申请日：1999-11-09

    申请人： Franklin P. Antonio ,  Leonard N. Schiff ,  William G. Ames

    发明人： Franklin P. Antonio ,  Leonard N. Schiff ,  William G. Ames

    IPC分类号： H04B169

    CPC分类号： H04B7/18534 ,  H04B7/10

    摘要： The information signals are transferred to end users, customers, or service subscribers using at least two signal sources, generally satellites, and polarized radiation. Two polarization modes are employed, with the preferred modes being left-hand and right-hand circularly polarized radiation, although other polarization modes may be employed. The total number of channels can be divided among the polarization modes and transferred to end users either through the use of polarization switching in the receivers to selectively switch between the satellites, or by switching elements in the satellites (sources) to switch between polarization modes used for transmission.

    摘要翻译： 使用至少两个信号源（通常是卫星）和偏振辐射将信息信号传送给终端用户，客户或服务订户。 采用两种偏振模式，其中优选的模式是左旋和右旋圆偏振辐射，尽管可以采用其它偏振模式。 信道的总数可以在极化模式之间划分并且通过使用接收器中的偏振切换来选择性地在卫星之间切换，或者通过卫星（源）中的开关元件在所使用的偏振模式之间切换来传送给终端用户 用于传输。

    OVERLAYING AN AIR TO GROUND COMMUNICATION SYSTEM ON SPECTRUM ASSIGNED TO SATELLITE SYSTEMS
    13.
    发明申请
    OVERLAYING AN AIR TO GROUND COMMUNICATION SYSTEM ON SPECTRUM ASSIGNED TO SATELLITE SYSTEMS 有权
    在分配给卫星系统的频谱上覆盖接地通信系统的空气

    公开(公告)号：US20130044611A1

    公开(公告)日：2013-02-21

    申请号：US13210628

    申请日：2011-08-16

    申请人： Ahmad Jalali ,  Leonard N. Schiff ,  William G. Ames

    发明人： Ahmad Jalali ,  Leonard N. Schiff ,  William G. Ames

    IPC分类号： H04B7/185 ,  H04W24/00

    CPC分类号： H04B7/18508 ,  H04B7/18502 ,  H04W16/14 ,  H04W36/20 ,  H04W36/30

    摘要： An air to ground communication system provides internet access to aircraft from ground based stations. The air to ground system shares spectrum with uplink portions of a satellite communication spectrum. Interference mitigation techniques are employed to avoid interference between the ground based communications and satellite communications. Fade mitigation techniques are employed to provide communication to aircraft at low angles of elevation in the presence of rain.

    摘要翻译： 空对地通信系统提供从地面站到飞机的互联网接入。 空对地系统与卫星通信频谱的上行链路部分共享频谱。 采用干扰减轻技术来避免基于地面的通信和卫星通信之间的干扰。 采用褪色减轻技术来在雨下的情况下以低仰角向飞机提供通信。

    Dual satellite navigation system and method
    15.
    发明授权
    Dual satellite navigation system and method 失效
    双卫星导航系统及方法

    公开(公告)号：US5126748A

    公开(公告)日：1992-06-30

    申请号：US702900

    申请日：1991-05-20

    申请人： William G. Ames ,  Irwin M. Jacobs ,  Lindsay A. Weaver, Jr. ,  Klein S. Gilhousen

    发明人： William G. Ames ,  Irwin M. Jacobs ,  Lindsay A. Weaver, Jr. ,  Klein S. Gilhousen

    IPC分类号： G01S5/00 ,  G01S5/12 ,  G01S13/87

    CPC分类号： G01S13/876 ,  G01S13/46 ,  G01S5/0009 ,  G01S5/12 ,  G01S2013/466

    摘要： A system and method for determining the position of an airborne object, using a fixed station and a pair of earth orbit satellites whose positions are known. Separate periodic signals are transmitted from the fixed station via the first and second satellites to the object whose position is to be determined. The phase offset in periodic characteristics of the periodic signals as received from the first and second satellites is measured at the object. The phase offset corresponds to a realtive time difference in propagation of the signals traveling two different paths to the object. The object transmits via the first satellite a return signal indicative of the measured relative time difference. This return signal is activated some time in the future according to the object local time, which is slaved to receipt of the periodic signal sent through the first satellite. This future time is the start of the particular time period as decided by the fixed station's schedule. At the fixed station, an instantaneous round trip delay, determined by the time offset of the current transmission clock time relative to the receive clock time of reception of the return signal, along with the measured relative time difference sent back on the return signal, is used to calculate the distances between the first and second satellites to the object. From these distances, along with the combined altitude of the object with the distance from the surface of the earth to the center of the earth, the position of the object is calculated.

    摘要翻译： 一种用于确定机载物体的位置的系统和方法，其使用已知位置的固定站和一对地球轨道卫星。 分离的周期信号从固定站经由第一和第二卫星发送到要确定其位置的对象。 在物体处测量从第一和第二卫星接收的周期性信号的周期特性中的相位偏移。 相位偏移对应于将两个不同路径传播到物体的信号传播的实时时差。 物体经由第一卫星发送指示所测量的相对时间差的返回信号。 该返回信号在将来根据对象本地时间被激活一段时间，该对象本地时间被接收通过第一卫星发送的周期信号。 这个未来时间是由固定电台的时间表决定的特定时间段的开始。 在固定站，由当前传输时钟时间相对于接收返回信号的接收时钟时间的时间偏移确定的瞬时往返延迟以及在返回信号上发回的测量的相对时间差是 用于计算第一和第二卫星与物体之间的距离。 从这些距离，以及与地球表面到地球中心距离的物体的组合高度，计算物体的位置。

    Mixed reuse of feeder link and user link bandwidth
    16.
    发明授权
    Mixed reuse of feeder link and user link bandwidth 有权
    馈线链路和用户链路带宽的混合重用

    公开(公告)号：US07525934B2

    公开(公告)日：2009-04-28

    申请号：US10940356

    申请日：2004-09-13

    申请人： William G. Ames ,  Leonard Norman Schiff

    发明人： William G. Ames ,  Leonard Norman Schiff

    IPC分类号： H04B7/204

    CPC分类号： H04B7/18515

    摘要： An apparatus and method for a wireless communication system in which a forward/uplink portion and a return/uplink portion are assigned within an available frequency bandwidth is disclosed. More particularly, a service area is divided into multiple regions. The assignment of the forward/uplink portion of the return/uplink portion is shuffled in the multiple regions. The apparatus and method may be implemented in a multi-beam wireless communication system.

    摘要翻译： 公开了一种用于无线通信系统的装置和方法，其中在可用频率带宽内分配了前向/上行链路部分和返回/上行链路部分。 更具体地，服务区域被划分为多个区域。 返回/上行链路部分的前向/上行链路部分的分配在多个区域中进行混洗。 该装置和方法可以在多波束无线通信系统中实现。

    Dual satellite navigation system
    17.
    发明授权
    Dual satellite navigation system 失效
    双卫星导航系统

    公开(公告)号：US5017926A

    公开(公告)日：1991-05-21

    申请号：US446979

    申请日：1989-12-05

    申请人： William G. Ames ,  Irwin M. Jacobs ,  Lindsay A. Weaver, Jr. ,  Klein S. Gilhousen

    发明人： William G. Ames ,  Irwin M. Jacobs ,  Lindsay A. Weaver, Jr. ,  Klein S. Gilhousen

    IPC分类号： G01S5/12 ,  G01S5/14 ,  G01S13/87 ,  G01S19/00 ,  G01S19/01 ,  G01S19/38 ,  G01S19/48 ,  H04B7/185

    CPC分类号： G01S19/00 ,  G01S13/46 ,  G01S13/876 ,  G01S19/38 ,  G01S5/14 ,  G01S2013/466

    摘要： A method and system for determining the position of an object using a fixed station and a plurality of earth orbit satellites whose positions are known. Separate periodic signals are transmitted from the fixed station via first and second satellites to the object whose postion is to be determined. The phase offset in periodic characteristics of the periodic signals as received from the first and second satellites is measured at the object. The phase offset corresponds to a relative time difference in propagation of the signals traveling two different paths to the object. The object transmits via the first satellite a return signal indicative of the measured relative time difference. This return signal is activated some time in the future according to the object local time, which is slaved to receipt of the periodic signal sent through the first satellite. This future time is the start of the particular time period as decided by the fixed station's schedule. At the fixed station, an instantaneous round trip delay, determined by the time offset of the current transmission clock time relative to the receive clock time of reception of the return signal, along with the measured relative time difference sent back on the return signal, is used to calculate the distances between the first and second satellites to the object. From these distances the position of the object is calculated.

    摘要翻译： 一种用于使用固定站和位置已知的多个地球轨道卫星来确定物体的位置的方法和系统。 分离的周期信号从固定站经由第一和第二卫星发送到要确定位置的对象。 在物体处测量从第一和第二卫星接收的周期性信号的周期特性中的相位偏移。 相位偏移对应于传播到对象的两个不同路径的信号的传播的相对时间差。 物体经由第一卫星发送指示所测量的相对时间差的返回信号。 该返回信号在将来根据对象本地时间被激活一段时间，该对象本地时间被接收通过第一卫星发送的周期信号。 这个未来时间是由固定电台的时间表决定的特定时间段的开始。 在固定站，由当前传输时钟时间相对于接收返回信号的接收时钟时间的时间偏移确定的瞬时往返延迟以及在返回信号上发回的测量的相对时间差是 用于计算第一和第二卫星与物体之间的距离。 从这些距离计算物体的位置。