性能保证条件下航空电子高速交换机的加速方法  

Speedup Scheme for Avionic High-speed Switch Under Performance Guaranteed Constraints

作　　者：王昊天[1] 李峭[1] 熊华钢[1] 

机构地区：[1]北京航空航天大学电子与信息工程学院,北京100191

出　　处：《航空学报》2010年第8期1653-1659,共7页Acta Aeronautica et Astronautica Sinica

基　　金：国家自然科学基金(60879024);航空科学基金(20081951028)

摘　　要：以保证航空电子互连网络的确定性延迟和高带宽为目的,建立航空电子交换式以太网(AFDX)承载于波分复用(WDM)之上的架构,兼容AFDX的延迟确定性和WDM的带宽可扩性,满足航空电子互连网络对实时性和高带宽的要求。通过对实时通信中周期性数据帧的分析,提出光波聚合加速方法,对输入端到达的数据帧进行重新分配和整型,充分利用每条光波的带宽资源,减少交换使用的波长数。在性能保证条件(100%通过率下保证有界延迟)下,对使用光波聚合方法的交换机制进行了数学推导。最后通过计算机仿真,以网络延迟时间率和加速因子为性能衡量指标推证了该加速方法的优越性和可行性。To achieve the deterministic delay and high bandwidth of an avionics network,an architecture of avionics full duplex switched ethernet（AFDX） over wavelength division multiplexing（WDM） is established,which enables the delay determination of the AFDX to be compatible with the bandwidth flexibility of the WDM and satisfies the demand of avionics interconnection networks for real-time constraint and high-bandwidth performance.Based on the analysis of the periodical frames adopted for real-time communication,a speedup scheme named wavelength aggregation is proposed,which reassigns and shapes the coming frames to realize the efficient use of the bandwidth of every optical wavelength and reduces the wavelength count for switching.On the premise of guaranteed performance（100% throughput with bounded delay）,a switching mechanism using the wavelength aggregation scheme is mathematically derived.Finally,taking the delay rate and speedup factor as the main indices,the merit and adaptability of the speedup scheme are verified by computer simulation results.

关 键 词：航空电子 航空电子交换式以太网 波分复用 性能保证交换 包交换网络 

分 类 号：V243.1[航空宇航科学与技术—飞行器设计] TP393[自动化与计算机技术—计算机应用技术]