Study On The Key Technology And Architecture Of The Future WDM-based Avionic Networks

Airborne network is the "bone" and "nerve" of the avionics system.With the increase of information of airborne network,the traditional single airborne network can no longer meet multiple requirements simultaneously,the research on the new airborne network has important significance for the development of airborne equipment.Based on the service demands of airbone network in the future and the problem that existing technology can not be compatible with bandwidth and real-time,we propose a TTE(Time-Triggered Ethernet)over WDM(Wavelength Division Multiplex)unified airborne network architecture to integrate the TTE access network and the WDM backbone,as well as the designing of the traffic model,protocol structure and network equipment model.In the network,the WDM backbone network achieves all-optical switching based on wavelength routing,the TTE subnet ensures real-time based on scheduling and achieves inter-network communication through access nodes.Aiming at the key technology in airborne network,we study the traffic burst and network reliability.1,Traffic burst is the main factor that affecting the certainty and congestion of the network.To ensure the real-time of the spontaneous messages and minimize the impact on the original services,we analyze the transmission mode,propose the strategy for sudden TT,RC and fortuitous messages respectively,and design a Free Slot and Priority Scheduling Algorithm based on Traffic Classed Transformation Strategy.2,The reliability of the safety-critical avionics network has always been a key point of network design.To improve the available probability of TT and reduce the influence of protection switch on scheduling,we build the reliability model and design the protection scheme from the aspects of task reliability and equipment reliability by configuring redundancy in subnet and sharing protection among backbone based on service level and link load,which reduces the failure probability and takes the shortest recovery time of TT.With network calculation tool,we deduce and analyze the delay upper bound of the traffics in the TTE over WDM network.The network model,node model and process model are established to set up a simulation platform on the OPNET.The following experiments are performed: 1,The statistics of the network delay and jitter are obtained to verify the rationality of TTE over WDM network architecture with proper network environment configurations and simulation parameters set.2,A detailed test program is put forward to verify the feasibility and advantages of the proposed solution by setting up the specific test platform for the burst and fault event.