中文摘要：

数据传输的及时性保障是航空电子全双工交换式以太网（avionics full duplex switched Ethernet，AFDX）中最主要的挑战。不同业务流有不同的实时性需求，因而提出一种高低优先级调度策略，通过随机型网络演算方法，推导出在某一概率下业务流端端时延的上界值。最后，在Simevent中搭建一个AFDX仿真案例，所提方法计算得到的时延上界与仿真结果相匹配，比传统计算方法更准确有效，同时也表明高低优先级调度有助于提高紧急数据的及时性。

英文摘要：

The timeliness protection of data transmission has been the major challenge in avionics full duplex switched Ethernet （AFDX）. For different applications having different real-time requirements, a priority sche duling policy which can deduce an upper bound value under a probability of data flow based on stochastic net work calculus is proposed. Then an AFDX simulation case is built in Simevent to get the result of upper bound delay which proves the new method is more accurate. And the fact that the priority scheduling policy is helpful in improving the timeliness of emergency data is also proved.