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根据航空电子体系结构的发展趋势和要求,说明时间触发以太网(TTE)的发展状况和国内外标准化工作的进展。分析了SAE AS6802时间触发以太网标准的范围与特色,重点说明SAE AS6802标准定义的TTE网络分布式时钟同步机制及其容错方法,并说明利用微秒级精度的全局时钟提高航空电子系统完整性的方法。
According to the development trend and requirements of avionics architecture, this paper describes the development of time triggered Ethernet (TTE) and the progress of standardization at home and abroad. The scope and characteristics of the SAE AS6802 time-triggered Ethernet standard are analyzed. The SAE AS6802 standard defines the distributed clock synchronization mechanism of the TTE network and its fault tolerant method. It also shows that using the global clock with microsecond precision improves the integrity of the avionics system method.