基于FPGA的相位同步快速算法研究与设计

Study and Design of Fast Synchronization in Phase Based on FPGA

摘要: 为实现同步系统中的信号相位同步，设计了一种基于FPGA的相位同步快速算法。在恒温晶振高精度低温漂的基础上，进一步实时测量恒温晶振频率，矫正后提供系统时钟，采用Verilog语言，算法中利用输入信号实时监听系统，使用的滑动平均滤波法，进一步使误差降低到5 ns。实验结果表明：结合FPGA的高速度，恒温晶振的高精度，该算法可以快速的精确的实现信号快速同步。此算法已在北斗/GPS授时同步系统中应用成功。

Abstract: To achieve signal synchronization in synchronism system, an algorithm based on FPGA was de-signed to do it. On the basis of oscillator with high precision and temperature offset, further, the system measures its real-time frequency, then provides system with correctional clock. The utili-zation of glide average method and Real time monitoring system in algorithm in Verilog make error decrease to 5 ns. The experiment shows that: with the high speed of FPGA and the high precision of crystal oscillator, the algorithm makes signal synchronization quickly as well as accurately. The algorithm is applied to BeiDou and GPS synchronized clock system successfully.