公开(公告)号：US5440313A

公开(公告)日：1995-08-08

申请号：US067947

申请日：1993-05-27

申请人： Terry N. Osterdock ,  David C. Westcott ,  Quyen D. Hua

发明人： Terry N. Osterdock ,  David C. Westcott ,  Quyen D. Hua

IPC分类号： G01R31/28 ,  G01S19/05 ,  G01S19/11 ,  G01S19/21 ,  G01S19/29 ,  G01S19/46 ,  G04G7/02 ,  H03L7/00 ,  H03L7/08 ,  H04B7/185 ,  G04B18/00 ,  H04L7/04

CPC分类号： H03L7/08 ,  G01R31/2841 ,  G04R40/06 ,  H03L7/00

摘要： A GPS-based frequency/time source of the present invention provides an accurate, traceable low cost reference. In particular, the GPS-based frequency/time source includes a GPS receiver, a variable frequency oscillator and a micro processor. The GPS receiver receives and produces as output signals GPS information, whereas the variable frequency oscillator has a frequency control input terminal and produces an output frequency signal, and is coupled to the GPS receiver. The micro processor is coupled to receive the output signals produced by the GPS receiver and produces an error signal indicative of a difference in frequency between GPS synchronized frequency and the output frequency signal of the variable frequency oscillator. Circuitry is responsive to the error signal to produce an electronic frequency control signal, which is applied to the frequency control input of the variable frequency oscillator so as to cause the difference in frequency to be reduced. In this manner, a low cost oscillator may be employed in such a way as to produce a very accurate output frequency signal.

摘要翻译： 本发明的基于GPS的频率/时间源提供了准确的，可追踪的低成本参考。 特别地，基于GPS的频率/时间源包括GPS接收机，可变频率振荡器和微处理器。 GPS接收机接收并产生GPS信息作为输出信号，而可变频率振荡器具有频率控制输入端并产生输出频率信号，并耦合到GPS接收机。 微处理器被耦合以接收由GPS接收器产生的输出信号，并产生指示GPS同步频率与可变频率振荡器的输出频率信号之间的频率差的误差信号。 电路响应于误差信号以产生电子频率控制信号，该电子频率控制信号被施加到可变频率振荡器的频率控制输入端，以便降低频率差。 以这种方式，可以采用低成本振荡器来产生非常精确的输出频率信号。