一种时间同步1553B总线通信协议RT突发数据发送控制方法

A Burst Data Transmission Control Method of RT Device for Time Synchronization 1553B Bus Communication Protocol

摘要:

时间同步1553B总线通信协议中，突发性数据需与长周期数据共用数据块获取服务，而协议中未规定两类数据同时产生时的发送控制方法。实际应用中，既需要确保突发性数据的实时性，又要尽量提升带宽利用率以确保不丢失长周期数据。本文提出了一种时间同步1553B总线通信协议远置终端（RT）突发数据发送控制方法。该方法根据待发数据项的实时性要求、数据量和数据生成周期，引入带优先级的总线组帧缓存，设计了两级“生产者-消费者”模型。试验结果表明，该方法通过基于优先级的发送控制，能够在尽快传输时间敏感数据项的同时，实现了对总线带宽的高效利用。本文所提方法已在多颗智能遥感卫星上得到应用并经过在轨验证，可为后续采用时间同步1553B总线通信协议的航天器软件设计提供参考。

Abstract:

In the time synchronization 1553B bus communication protocol, the burst data needs to share the data block acquisition service with the long-period data, but the protocol does not specify the transmission control method when the two kinds of data are generated simultaneously. In practical application, it is necessary to ensure the real-time performance of the burst data and improve the bandwidth utilization ratio as much as possible to avoid the loss of long-period data. In this paper, a remote terminal (RT) burst data transmission control method for time synchronization 1553B bus communication protocol is proposed. According to the real-time requirements, data volume and generation cycle of data items to be transferred, a data block transmission frame organization buffer with priority is introduced, and a two stage “producer-consumer” model is designed. The experimental results show this priority based transmission control method can transfer time-sensitive data items as soon as possible and realize efficient utilization of bus bandwidth. Proposed method has been applied to various intelligent remote sensing satellites and verified in orbit. It can provide reference for the subsequent spacecraft software design based on the time synchronization 1553B bus communication protocol.