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    • 10. 发明授权
    • Satellite telecommunication system with apparatus for protecting radio
astronomy and method of using same
    • 具有用于保护射电天文学的卫星电信系统及其使用方法
    • US5548800A
    • 1996-08-20
    • US254012
    • 1994-06-03
    • Keith A. OldsChristopher N. Kurby
    • Keith A. OldsChristopher N. Kurby
    • G01S19/11H04B7/185
    • H04B7/18513
    • A constellation of satellites distributed around the earth serves as a communication network that supports global communication of subscriber units. Subscriber units may potentially transmit from any location on earth. Some locations such as radio astronomy sites may be interfered with by nearby transmissions from subscriber units. Subscriber units located within a potentially interfering proximity to radio astronomy sites are prohibited from transmitting potentially interfering signals by reception of a non-interfering beacon at radio astronomy sites. The beacon repeatedly transmits a synchronous control signal with a subscriber unit's servicing satellite's control signal. The beacon's control signal is compatible with a subscriber unit's communication receiver. Control signal information contained in a beacon control signal inhibits the subscriber unit from transmitting.
    • 分布在地球上的卫星星座作为支持用户单元全球通信的通信网络。 用户单元可能可能从地球上的任何位置传输。 诸如射电天文遗址的某些位置可能受到来自用户单元的附近传输的干扰。 位于与射电天文台站潜在干扰接近的订户单元被禁止通过在射电天文站点接收非干扰信标来发送潜在的干扰信号。 信标反复发送具有用户单元的维修卫星的控制信号的同步控制信号。 信标的控制信号与用户单元的通信接收机兼容。 包含在信标控制信号中的控制信号信号禁止用户单元的发送。