Research On Scheduling Mechanism Of FC-AE-1553 Network

With the advancement of the national aerospace science and technology strategy,the space application information system has become an indispensable part of it.In order to meet people's scientific research and application development,more and more space science experiments and related application load services also increase.Therefore,the network transmission,data processing and storage of application systems in avionics systems are getting higher and higher Request.For the future development trend of avionics,the traditional avionics system represented by MIL-STD-1553B data bus technology has low transmission rate and high bit error rate,and the transmission medium is cable copper cable.The heavy weight can not satisfy the future avionics System requirements.Fiber Channel Technology(FC)is favored by avionics users with the advantages of low latency,high bandwidth,low error tolerance,and good adaptation to harsh electromagnetic environments.Therefore MIL-STD-1553B and other buses are replaced by Fiber Channel,the future of avionics systems to achieve full optical interconnection has become an inevitable trend.In this paper,FC-AE-1553 network optical module single event effect test and high-precision time synchronization method of research and design and test,the main contents and research results are summarized as follows:1.For the problem of FC-AE-1553 network optical module affected by the single-particle effect,this paper designs and implements the FC-AE-1553 single-effect testing platform for optical module based on FPGA.The platform can monitor the optical module status in real time,including bit errors.Rate and out of step and other parameters.Based on the platform,the HI-13 series electrostatic accelerator and the nanosecond laser were used to perform single-event effect tests on various optical modules,respectively,verifying that the test optical module has good radiation resistance and confirmed the effectiveness of the platform.2.Aiming at the requirement of time synchronization in FC-AE-1553 network,this paper designs a FC-AE-1553 network time synchronization scheme.The principle and scheme design of the synchronization scheme are introduced in detail,and the synchronization accuracy and its influencing factors of the synchronization scheme are analyzed.The results of semi-quantitative analysis show that the time synchronization accuracy of the time synchronization scheme designed in this paper meets the task requirements of the application information system.3.In order to meet the testing requirements of FC-AE-1553 network time synchronization accuracy,this paper implements a time synchronization scheme based on FPGA and builds a synchronization accuracy test platform.Experimental verification and testing are performed on the designed time synchronization scheme and the key factors affecting synchronization accuracy.The test results show that:the designed time synchronization scheme,the time synchronization accuracy of about 190ns when the synchronization period is 10ms,to meet the time synchronization accuracy requirements of 1us.