【摘要】 针对目前广泛对高精度频率源的需求,利用FPGA设计一种恒温晶振频率校准系统。系统以GPS接收机提供的秒脉冲信号为基准源,通过结合高精度恒温晶振短期稳定度高与GPS长期稳定特性好、跟踪保持特性强的优点,设计数字锁相环调控恒温晶振的频率。详细阐述系统的设计原理及方法,测试结果表明,恒温晶振的频率可快速被校准到10 MHz,频率偏差小于0.01 Hz,具有良好的长期稳定性,适合在多领域中作为时间频率的标准。更多还原

【Abstract】 Aiming at high-precise frequency source magnitude necessary at present,a frequency calibration system for OCXO is designed by FPGA.A DPLL is designed to regulate the frequency of OCXO.The main idea behind is to use the 1PPS signal,which comes from GPS receiver,as a reference to calibrate the OCXO(oven controlled crystal oscillator) by integrating the long-term stability,excellent tracking and holding characteristic of GPS and the short-term accuracy of OCXO.The design principle and method are described in detail.The test results indicates that the system can fast achieve high precise and stability,frequency error is lower than 0.01Hz.It can be used for standard of time and frequency measurement reference.更多还原