基于TTE的确定性机载网络通信系统关键技术研究

实时性差和可靠性低是当前机载网络通信系统面临的两大主要难题，难以满足未来先进航电系统的发展需求。时间触发以太网采用时间触发的通信机制，可有效提高系统实时性、可靠性，实现确定性机载网络通信。本项目拟针对时间触发以太网通信系统中的时间同步、任务调度和可靠通信三个关键技术展开研究: 结合时间触发以太网的通信特点和网络结构，采用二级分层的时间同步策略，利用递推最小二乘法和延迟补偿技术实现高精度的时间同步；利用Petri网对时间触发以太网复杂的通信任务调度问题进行建模，并利用智能优化算法求解高效的任务调度表；采用高可靠的时钟源保证机制、双余度可靠传输技术和基于通信任务调度表的故障诊断及定位方法提高网络通信的可靠性。时间触发以太网是未来机载网络通信系统的主要发展方向，该项研究可为我国航电事业的发展奠定重要的理论和技术基础。

The problems of the airborne communication network are the poor performance of real-time and reliability, which hinder the future development of advanced avionics system. Adopting the time-triggered communication method, the Time-Triggered Ethernet is a deterministic airborne communication system with excellent performance of real-time and reliability. The key technologies of Time-Triggered Ethernet are the time synchronization, schedule optimization and reliable communication methods, which would be studied in our research. Based on the characteristics and network structure of Time-Triggered Ethernet, a two-level time synchronization strategy, recursive least squares time synchronization algorithm and the delay compensation method are proposed to achieve high-precision time synchronization. The complex communication task scheduling problem of Time-Triggered Ethernet is modeled by Petri Net method and optimized by intelligent optimization algorithms. The reliability is improved by clock source assurance mechanism, double redundant transmission technology and fault diagnosis method based on the pre-set task scheduling table. As Time-Triggered Ethernet has a good development prospect in the future, our research would promote the development of China’s avionics industry both in theory and technology.