Research And Application On Avionics Bus Monitoring

Bus monitoring research was important for bus fault diagnosis, aircraft security,multi-vehicle coordination algorithms,bus integrate,data transmitssion. To achieve the goalsof timely processing data which changed anytime and the goals of maximum utilizationof all avionics equipment to do their own resource-sharing capabilities,and making the entireintegrated avionics systems working reliably and efficiently,it need to usethe stable high-speed on-board data bus technology. However, the existing bus monitoring system canonly be fixed for a single bus to monitor and did not consider the demand of some areas, suchas clock synchronization,monitoring software and distribution of the open buscommunicationsdata and GIS integration, and so on.We carried out a in-depth study for bus monitoring. First, for the high precision of theequipment required time synchronization for monitoring system, we took into account the transmissi--on delay, clock offset error and network queuing delay, and bring network traffic jitter as animportant factor into the synchronization algorithm, we proposed a distributed clock synchronizationalgorithm CSA-RTMS which based on avionics bus-based real-time monitoring system; and analyzedthe error range of the performance. Compared to the traditional NTP synchronization protocol,experimental results show that, our synchronization method which less affected by the network jitter,has higher accuracy and faster efficiency.Secendly, after a study of scenarios and disadvantagesof the traditional model data acquisition,we proposed a master-slave control of multi-threaded parall--el acquisition model. And demonstrated the advantages of the model, through the model analysisand comparison of different performance indicators, and realized the model.Thirdly,after the analysisof the importance of ICD, we designed XML-based ICD which was user friendly and completed theautomatic conversion of XML doc. And realized the Universal bus data analysis techniques.Fourthly,after Comparison of the popular GIS, chosen MapX technology, designed and implemented therequired two-dimensional situation display function module. Finally, we designed and implementedsimulation platform-based multi-bus real-time monitoring system(DMRMS). Two-dimensional situat--ion display, real-time curve drawing, and data buffering mechanism were optimized.The novelty of the paper were as follows: for multi-bus real-time monitoring software,weproposed CSA-RTMS, which improved clock synchronization accuracy is high-precision clocksynchronization algorithm; combined with single bus monitoring technology,we explored the multi-bus monitoring tech in the process of data collection model, the dataanalysis method of handling mechanism, as well as software design to improve the timeliness ofsystem; also we integrated component-based GIS to the system which displayed in a graphical formof dynamic multi-bus live content， and optimized the related performance problems, whichenhanced thepracticality of the monitoring system.