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    • 5. 发明授权
    • Apparatus for positioning an antenna in a remote ground terminal
    • 用于将天线定位在远程接地终端中的装置
    • US5589837A
    • 1996-12-31
    • US384060
    • 1995-02-06
    • Mohammad SoleimaniJohn E. Corrigan, IIIMohammad BukhariDavid A. Roos
    • Mohammad SoleimaniJohn E. Corrigan, IIIMohammad BukhariDavid A. Roos
    • H01Q1/12H01Q3/00
    • H01Q1/1257
    • An apparatus for positioning a directional antenna of a remote ground terminal which transmits and receives signals to and from a satellite via the antenna. The apparatus includes a signal generator for producing a frequency variable reference signal having a variable duty cycle, and a controller which operates to analyze the signals received from the satellite and to vary the duty cycle of the reference signal in accordance with an identification tag forming part of the received signals. The apparatus further includes a detector which receives the reference signal and produces an antenna pointing signal having an average amplitude proportional to the duty cycle of the reference signal. The controller commands the signal generator to produce a reference signal having a first duty cycle when a signal having an identification tag not corresponding to a designated central hub station is received by the antenna, and a reference signal having a second duty cycle when a signal having an identification tag corresponding to the designated central hub station is received by the antenna. The reference signal having the first duty cycle causes the average amplitude of the antenna pointing signal to equal a first value, while a reference signal having the second duty cycle causes the average amplitude of the antenna pointing signal to equal a second value. During installation, the antenna is rotated until the average amplitude of the antenna pointing signal equals the second value.
    • 一种用于定位通过天线向卫星发送信号和从卫星接收信号的远程接地终端的定向天线的装置。 该装置包括用于产生具有可变占空比的频率可变参考信号的信号发生器,以及用于分析从卫星接收的信号并根据识别标签形成部分改变参考信号的占空比的控制器 的接收信号。 该装置还包括检测器,其接收参考信号并产生具有与参考信号的占空比成比例的平均振幅的天线指向信号。 当具有不对应于所指定的中心中心站的识别标签的信号被天线接收时,控制器命令信号发生器产生具有第一占空比的参考信号,以及具有第二占空比的参考信号,当具有 由天线接收与指定的中心中心站对应的识别标签。 具有第一占空比的参考信号使得天线指向信号的平均幅度等于第一值,而具有第二占空比的参考信号使得天线指向信号的平均振幅等于第二值。 在安装过程中,天线旋转直到天线指向信号的平均幅度等于第二个值。