Software Design And Implementation Of FC-AE-1553 Node Based On PON Topology

The rapid growth of information capacity and the strong desire for bandwidth have made avionics networks have higher and higher requirements for bus technology.Traditional MIL-STD-1553 bus has a bottleneck problem with the transmission rate and the number of allowed terminals.After the appearance of Fibre Channel technology,it has been widely used in the field of militarization due to its characteristics of high transmission rate,high bandwidth and high reliability.The avionics sub-committee proposed that Fibre Channel be used as the underlying transmission network and the high-level mapping MIL-STD-1553 bus protocol to achieve the high-performance FC-AE-1553 protocol.This protocol is not only compatible with traditional MIL-STD-1553 bus devices,but also has the advantages of FC technology.However,in the FC-AE-1553 network,the switched topology is widely used.The switches in this topology are relatively expensive,and the active characteristics of the device will generate strong power consumption and electromagnetic interference.Passive Optical Network(PON)has the advantages of simple topology and low transmission power,which can make up for the shortcomings brought by the switch.This article proposes a FC-AE-1553 protocol implementation scheme based on a PON structure.Passive optical splitters replace active switches,which can improve network reliability and reduce power consumption and costs.Firstly,this article briefly introduces the content related to the FC-AE-1553 protocol,including the traditional MIL-STD-1553 network structure and word format,the hierarchical model,topology structure and frame format of the FC protocol,and the FC-AE-1553 network interconnection model.Then,the transmission specifications of the protocol designed in this paper are introduced in detail,and defines and analyzes the protocol characteristics,network topology and frame format according to the particularity of the avionics network.Then based on the OPNET software platform,a three-layer modeling mechanism is used to design a node model,a process model,and a network model respectively.The designed protocol is simulated,and the reliability of the network is verified based on the two characteristics of network throughput and delay,which provides a theoretical basis for subsequent practical applications.Then,on the basis of the previous study of the protocol and the real environment ofthe avionics system,functional requirements analysis and system architecture design were carried out.The design of the key modules in the node card driver is elaborated,and in order to improve the amount of data for a single DMA transfer and the overall transfer rate of the PCIE,the design and implementation of the scatter gather DMA transfer module are analyzed.According to the different roles of nodes in the network,the key technologies of the upper layer application program of the node card are designed in detail,including data generation module,NC processing module and NT processing module.The upper interface software is designed.Finally,on the basis of the hardware board and the optical module,a test platform was built to test and analyze the designed DMA transmission module and the software module of the FC-AE-1553 node card,respectively verifying the high rate of DMA read and write,software functions and protocol logic,which provides a reference for the further study of FC-AE-1553 based on PON structure.