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    • 15. 发明申请
    • FREQUENCY DRIFT ESTIMATION FOR LOW COST OUTDOOR UNIT
    • 低成本户外单位的频率估计
    • WO2010080823A1
    • 2010-07-15
    • PCT/US2010/020246
    • 2010-01-06
    • THE DIRECTV GROUP, INC.POPOLI, Robert, F.
    • POPOLI, Robert, F.
    • H03J7/04
    • H04H40/90H03J7/04
    • Systems and devices for controlling frequency drift in satellite broadcast systems. A receiver antenna system for a direct broadcast satellite signal communications system in accordance with one or more embodiments of the present invention comprises an oscillator, a mixer, coupled to the oscillator, for converting satellite signals at a first frequency to signals at an intermediate frequency, an analog-to-digital (A/D) converter, coupled to the mixer, for receiving the signals at the intermediate frequency and for converting the signals at the intermediate frequency at near-real-time to a digital data stream, a Digital Signal Processor (DSP), coupled to the A/D converter, for processing the digital data stream, and a drift estimator, coupled to the DSP, the drift estimator determining a frequency drift of the oscillator, wherein the receiver antenna system corrects the frequency drift of the oscillator using the determined frequency drift.
    • 用于控制卫星广播系统中频率漂移的系统和设备。 根据本发明的一个或多个实施例的用于直播广播卫星信号通信系统的接收机天线系统包括耦合到振荡器的振荡器,混频器,用于将第一频率的卫星信号转换为中频信号, 耦合到混频器的模拟数字(A / D)转换器,用于接收中频处的信号,并将接近实时的中频信号转换成数字数据流;数字信号 耦合到A / D转换器的用于处理数字数据流的处理器(DSP)和耦合到DSP的漂移估计器,漂移估计器确定振荡器的频率漂移,其中接收器天线系统校正频率漂移 的振荡器使用确定的频率漂移。