Research On The Key Technologies Of The UAV's Airborne Network Unified Bus

The airborne network bus technology is one of the key technologies,and its purpose is to realize information synthesis and function synthesis of avionics system.The architecture of generation avionics system requires its generation bus.Correspondingly,the next generation bus also further supports the development of the next generation avionics system.The architecture of avionics system has undergone the evolution of separation,combination,integration and advanced integration.And airborne bus has also developed from point-to-(multiple)point such as RS-422,ARINC429 to the network bus like 1553 B,and the circular structure bus like 1394 b,and then to switched network like AFDX or FC.As a typical hybrid key system,UAVS is supposed to achieve integrated design of optimized system architecture with a unified network bus,which puts forward the requirements of higher real-time,higher certainty,higher reliability,higher bandwidth and better adaptability for bus network.This thesis firstly analyzes the typical airborne network bus technology development and application status at home and abroad.Considering requirements of actual application data transmission,this thesis puts forward main functions and performance requirements of a new unified airborne bus for UAVS,for optimizing airborne network design,simplifying system architecture,convenient protocol processing,smaller system weight,lower cost,higher bandwidth and better real-time performance,certainty,reliability and adaptability.Through the research of the following key technologies,it provides technical support and guarantee for the realization of the new unified bus.1)Through the research of clock synchronization technology,it provides a time reference for a new unified bus based on time trigger mechanism.2)Through the research of high deterministic and strong real-time communication protocol,the communication strategy of message scheduling and transmission with high certainty is realized,which combines the requirements of time trigger and event trigger,high priority and low priority,periodic information and aperiodic information,small data module and big data module.3)Through the research of high security fault-tolerant mechanism,the high reliable transmission of datainformation is realized.4)Through the development of highly efficient and flexible supporting softwares,it provides guarantee for the flexible application and testing-analysis of the new unified bus.Finally,a simulation platform of airborne unified bus in UVAS is set up to evaluate and analyze the key technical indicators that directly affect the application,such as clock synchronization precision,transmission delay,transmission cycle jitter and transmission error rate.It lays a foundation for the engineering application of the new unified bus.