航空电子系统机载网络实时性能评价技术

机载网络是航空电子系统中实现信息实时可靠传输的手段，其发展程度和能力决定了航空电子系统的总体构型及信息综合效能。不同于一般计算机网络，机载网络更加强调组网的实时性，需要采用苛刻高效的方法实现其实时性能的分析与评价。以交换式网络中消息传输过程为分析对象，研究了消息端到端传输延迟模型，给出了实时性能评价方法在评估悲观性和计算紧性的对比指标；对解析分析、行为仿真和模型检查等典型机载网络实时性评价关键技术进行了梳理和分析，给出了各种实时性能评价方法在计算紧性和效率等方面的差异和实现途径。以简单网络和工业规模网络为研究案例对上述方法进行了验证说明，并对比分析了各种方法在计算紧性的差异，探讨了航空电子系统机载网络实时性能评价技术的发展趋势。 

Real-time performance evaluation technology of airborne network for avionics system

Airborne network is the key to realize real-time reliable transmission of information in avionics system. Its development degree and capability determine the overall configuration and comprehensive information efficiency of avionics system. Unlike general computer networks, airborne networks emphasize the real-time ability of airborne network and need strict and efficient methods to analyze and evaluate the real-time performance. Taking the process of message transmission in switched networks as analysis object, the end-to-end delay model is summarized and the comparison indexes of evaluation pessimistic degree and calculation tightness for different real-time evaluation methods are proposed. The typically evaluation solutions for avionics environment such as analytical analysis, behavior simulation and model checking are listed, the differences in calculation tightness and effectiveness of these real-time evaluation methods are compared, and the realization approach is analyzed. Furthermore, these methods are verified and illustrated through two typical networking cases:a simple network and an industrial scale network, and the calculation tightness of different evaluation methods is also compared and analyzed. Finally, the development trend of airborne network real-time performance evaluation technology for avionics system is discussed.