CANaerospace协议实时性分析与研究

为了满足航空领域对实时性的要求,作为CAN总线(Controller Area Network)的应用层扩展协议,CANaerospace协议在保留CAN总线已有物理层和数据链路层的基础上,应引入时间触发调度机制,并增加对系统冗余设计的支持。本文通过分析计算认为,CANaerospace协议具有带宽利用率较高、最大传输延迟可确定等性能特点。同时,经过与MIL-STD-1553B总线性能的分析比较后得知,CANaerospace协议可以在某些实时性应用场合替代1553B协议。

Analysis and Research of CANaerospace Real-time Performance

In order to meet the requirements in the aerospace domain with respect to the real-time application,as a controller area network(CAN)bus application layer expansion protocol,on the foundation of retaining existent physical layer and data link layer of CAN bus,it should introduce the time trigger scheduling strategy and add the support of the redundance to the system design.In this paper,through the numerous analyses and calculuses,and also via the comparison with the performance of Mil-Std-1553B bus,it turns out that CANaerospace protocol possesses the advantages of high availability of bandwidth and the determinability of maximum transmission delay etc.;and that 1553B protocol can be replaced by CANaerospace protocol under certain real-time circumstance.