通常时统设备中都采用晶体振荡器或者铷钟作为频率标准，但由于老化和温度等原因导致其短期准确度和长期稳定度不尽如人意。随着科技的飞速发展，精确时间频率的应用已经深入到测控、导航、通信、电力、交通等部门，人们对高精度标准时间频率的需求也越来越高。因此设计自动校频系统变得十分必要。 传统的驯服晶振系统采用模拟或半数字体制，其存在成本高、受环境因素影响大、调试困难和建立模型不易等缺点。本文根据驯服晶振技术的时间频率基本原理，针对传统驯服晶振技术的缺点，设计了一种基于TDC-GP1的驯服晶振系统，该系统可以提高时差测量精度，利用先进晶振噪声模型，便于分析与调试，跟踪能力和保持能力均优于传统方法。这种新系统使用TDC芯片构建一个高分辨率鉴相器，采用卡尔曼滤波技术将晶振噪声模型融合到锁相环结构中，提高时统设备频率准确度和稳定度。 在此研究基础上设计并实现了一种基于TDC-GP1的数字驯服晶振系统，可以方便实现对外部1pps信号的跟踪。该系统由于采用全数字结构而具有良好的抗噪声性能，从而提高1pps跟踪准确度和稳定性。最后对该设备输出1pps进行阿伦方差测量，测量结果表明，这类数字驯服晶振系统可以在一定程度上提高本地晶振准确度和稳定度。

Usually, a crystal oscillator or rubidium is used in the Time Unit System equipments as a clock frequency standard, but its drawbacks of long-term stability do not satisfy applications because of its aging or some other reasons. With the rapidly development of science and technology, the precise time and frequency have been applied to monitoring and control, navigation, communications, electricity, transport fields, etc.. The demands in high precision time and frequency standards are becoming higher and higher. So, designing an automatic adaptive frequency system becomes very necessary. Analog or semi-digital system are used in the traditional Disciplined Clock system ,which has some shortcomings such as high costs, the impact of environmental factors, debugging and modeling difficultly and so on. Based on the basic principle of time and frequency of disciplined clock technology, this paper designs a system for traditional shortcomings, which based on TDC-GP1 of disciplined clock System. This system can improve measurement accuracy, and using advanced Crystal Oscillator model, in order to analysis and debugging the system easily. Also the new system’s Tracking and holding abilities are better than traditional methods. This new technology within a high-resolution phase_dectector using pseudo-random code, furthermore in which a crystal model is embedded into the PLL with the Kalman filter technology, can improve the accuracy and stability of the time output of equipment . A disciplined clock system based on the TDC-GP1 is designed and realized with the new technology presented above in the dissertation .It can easily track external 1pps signal. A wonderful anti-noise performance can be obtained in this system because of its full digital structure. Thereby, it can improve the accuracy and stability of tracking 1pps signal. Finally, as well as the Allan-variance of output is measured and analyzed, the result shows this kind of digital disciplined clock can improve the stability of the equipment’s output.