星载计算机模块间时钟同步方法

摘要

To realize both high performance and high reliability of integrated modular architecture (IMA) of space avionics ,I/O modules no longer exclusively belong to a single processor module .Both processor and I/O modules can somehow work inde‐pendently .Such module‐independency requires a light‐weight ,high‐reliable inter‐module clock synchronization algorithm .Based on the characteristics of respective oscillators of the same frequency ,an inter‐module clock synchronization algorithm suitable for FPGA implementation was presented .The offset of synchronization is smaller than 4T0 ,in which T0 is the labeled period of os‐cillators .The algorithm can be used in N‐module‐redundant real‐time control computer systems including satellite on‐board com‐puters .%为实现卫星电子系统的模块综合化并提高空间环境适应性，星载计算机中处理器模块和接口模块不再具有一一对应关系，每个模块都具有一定的独立工作能力，模块间需要一种轻量级、高可靠的时钟同步方法。在分析同频不同源晶振工作特性的基础上，在中小规模FPGA上实现的星载计算机模块间时钟同步方法可以提供同步误差小于4 T0（T0是晶振的标称周期）的同步脉冲，可用于包括星载计算机在内的多冗余高可靠实时控制计算机。