| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a reference signal generating apparatus capable of solving a problem related to self-traveling oscillation such as the temporal limitation of maintenance work by suppressing a phase difference during hold-over even if an inexpensive CPU having low arithmetic throughput is used. <P>SOLUTION: A control section 10 observes and stores the level of a synchronous control voltage signal while 1PPS is inputted with the passage of time. When the input interruption of a reference signal is detected, the control section 10 generates a first control voltage signal for self-traveling and gives it to a voltage controlled oscillator 14. Furthermore, while the voltage controlled oscillator is controlled using the first control voltage signal for self-traveling, the control section starts to calculate a second control voltage signal for self-traveling. As soon as the second control voltage signal for self-traveling is completely calculated, the control section calculates a control voltage correction value for self-traveling and continues control while canceling a phase difference. Thereafter, an N-th control voltage signal for self-traveling is repeatedly calculated until the end of hold-over (H.O.), thereby generating a high-precision reference frequency signal. <P>COPYRIGHT: (C)2010,JPO&INPIT |
