关键词: 时间数字转换器, ARM, 比例积分微分控制器, 高精度授时

Abstract: Aiming at the low accuracy of the existing power,communication and other timing systems,a TDC-based high-precision Beidou timing system is designed.The system uses STM32F2xx/STM32F4xx chips as the core signal processor,compares the phase difference between standard 1PPS and synchronous 1PPS,combines TDC’s high-precision measurement technology for time delay,uses PID algorithm to adjust the local OCXO voltage control value,so that OCXO output is stable Clock frequency to achieve high-precision timing.At present,the timing accuracy of Beidou receivers is generally better than 50ns,and the timing accuracy is less than 20ns to achieve high-precision timing standards.Experimental results show that the timing accuracy of this method can reach 13ns,which can realize Beidou high-precision timing.

Key words: TDC(Time-to-Digital-Converter), ARM(Advanceed Risc Machine), PID(Proportion-Integration-Differentiation-Controller), High precision timing