摘要
对用远距离传输的GPS秒信号锁定本地高频晶体振荡器的方法进行了探讨。介绍了高精度的时间数字转换器TDC(TimetoDigitalConverter)和对滤波的方法进行了探讨。为了降低成本又能够满足设计要求的精度,还考虑了双D/A转换的方法。有关的硬件系统已经通过了调试和一系列的测试和实验,在测量和控制精度方面,能达到设计的要求。此外,提出了这个系统有待解决的问题,如双D/A转换的非线性问题,Kalman滤波抗野值及继续提高精度的问题。
A method to lock the local high frequency crystal oscillator with the GPS 1pps signal transmitted from long distance is discussed.A high precision TDC(time to digital converter)is introduced and the filtering methods are discussed.In order to reduce the cost as well as to reach the demanded precision the double D/A conversion is adopted.The hardware system has been debugged and tested,and the experiments show that the system fulfills the design requirements for measurement and control precision.Besides,several problems waiting for solutions,such as the nonlinearity of the double D/A conversion,the fault tolerance of Kalman filtering and the further improving of the precision,are pointed out in this paper.
出处
《时间频率学报》
CSCD
2004年第2期94-102,共9页
Journal of Time and Frequency
