一种基于包交换的有效载荷时间同步方法的设计和实现

摘要

In order to solve the problem of limited time synchronization accuracy of payloads on spacecraft.A time synchronization method based on packet switching is proposed.The method realizes time synchronization of multi-payload with high reliability and high precision by step time compensation and frequency correction.At the same time,the network scheduling control is carried out to ensure that the influence of synchronization period and network background traffic on the time synchronization accuracy is reduced to the minimum.In the experimental verification,the implementation of this method is combined with the fibre channel network on the Xilinx K7 FPGA board.A nanosecond time synchronization is achieved with a small amount of hardware and network resources.%为了解决航天器上各有效载荷时间同步精度有限的问题,提出了基于包交换的时间同步方法.该方法通过步进式的时间补偿和频率校正,实现多载荷、高可靠、高精度的时间同步.同时进行网络调度控制,保证同步周期和网络背景流量的变化对时间同步精度的影响降到最低.在实验验证中,将该方法的实现与光纤网络结合,在Xilinx K7系列FPGA板卡上实现了整个时间同步系统.使用小部分的硬件和网络资源,实现纳秒级的时间同步.