基于AS5643总线的机载时间同步

Airborne Time Synchronization Based on AS5643 Bus

为了使机载电子系统中的各个分系统协同完成既定任务,通常需要一个统一的时间标准。针对采用专用硬件的时间同步方法会造成系统开销较大的问题,提出了一种基于AS5643总线的时间同步方案,利用同步帧分发时间信息,并采用软件方法完成时间偏移测量及补偿,可达到优于50 ns的同步精度。详细介绍了基于AS5643总线的时间同步方法、同步原理及具体实施方案,最后通过实物验证表明该方法正确可行。该方法开销低、精度高,可应用于综合化航空电子系统中。

In order to make each avionic subsystem cooperate with each other to accomplish the assigned tasks in an airborne system,a uniform clock standard is required. To solve the high costs of hardware meth-od for time synchronization,a time synchronization method based on AS5643 bus is proposed. The time in-formation is distributed by synchronous frame,and the software method is employed for time offset measure-ment and compensation. The synchronization precision of the proposed method can reach 50 ns. This paper introduces the time synchronization method,basic theory and the implementation scheme based on AS5643 bus,and proves the feasibility of the proposed method through experiment. The proposed method has the advantages of low costs and high precision,and it can be used in integrated avionic systems.