The Research And Design Of High Precision Time Synchronization System Based On GPS

As the productivity drive the high technology to a faster development, we make high-precision time synchronization system more and more use in many fields such as communications,deep-space exploration and national defence. How to make time synchronization system achieve higher precision and how to make the system operation more reliable and much safer and how to make lower cost in developing such system are need for great development, also they are the hotspot and nodus in developing the time synchronization system. We can easily use Global Positioning system to make up high-precision and low-cost time synchronization system because it has high stability and precision atom standard and it's signal can wholly cover the earth at any time and at any weather.It is adopted in this thesis to calibrate time and frequency signal generated by atom clock on ground with GPS second-pulse signal, and then to let the calibrated signal be the output of synchronization system after studying merit and flaw of different high-precision time synchronization system which is made with GPS. This project make full use high-precision second-pulse signal to be a time reference signal and integrate GPS second-pulse good long-term stability with atom clock good short-term stability, so it don't need extra high-precision time and frequency standard and also don't let every station transmit signal each other to achieve synchronization As a result, this system have these advantages of high precision, simple structure, low cost and easy project realization. The synchronization system is globally and locally designed in detail in this thesis, selecting the advanced programmable logic device——FPGA and adopting the advanced design method------EDA to design measurementand calibration module, and then launching function simulation and timing simulation to valid the system feasibility. To achieve a higher synchronization precision, some researchs are made in this thesis on how to design synchronous digital circuit. The author finally make reliability and anti-disturbing design for the system's more safe operation. The system achieve predicted goal by practical experiment. At last, some advice on improvement this design is pointed out.