Design And Verification Of ARINC818 Video Transmission Protocol Based On FPGA

In recent years,with the rapid development of electronic information technology,the information processing in the avionics system has been basically digitalized,especially the digitized video image information between airborne equipment has increased dramatically,and the high reliability and high transmission rate in the process of video data transmission have been It has become the core requirement of the video transmission system,and the traditional video bus can no longer meet the requirements of the new generation of aviation system video transmission.Therefore,the ARINC818 bus protocol came into being,which is also known as the aviation digital video bus(Avionic Digital Video Bus,ADVB).ARINC818 bus is born out of Fiber Channel.Compared with other buses,it has the characteristics of high bandwidth,low delay,anti-interference and simple connection.It has been widely used in the transmission of digital information between video equipment in avionics systems.Based on the airborne video transmission system module development project,this paper firstly conducts a comprehensive analysis and in-depth research on the ARINC818 bus protocol on the basis of the research on the related technologies of airborne video processing at home and abroad,and introduces the protocol hierarchy,basic transmission unit and ADVB video frame structure,describes the video frame mapping method in detail,and lays a theoretical foundation for the realization of the video transmission system;then combined with the system index requirements,through the analysis of the video data transmission process,the overall scheme design of the high-speed and high-reliability video transmission system is completed: Convert the captured video into RGB format and transmit it to the ADVB transmitter through the PCIe interface,encapsulate it into ADVB frames according to the ARINC818 protocol,and send it to the photoelectric conversion module after 8B/10 B encoding,and complete 8B/10 B at the video receiving end.After decoding and ADVB frame parsing,it is sent to the display end;after that,the specific design of the transmitter and receiver is carried out,and the simulation is carried out on Modlesim;finally,the test and verification are carried out based on the FPGA platform.The system adopts improved8B/10 B codec,combines table look-up method and logic method,improves the coding circuit,realizes multi-channel parallel coding,and achieves a good compromise between resource occupation and coding speed,and at the end of the coding process After that,CRC check and video retransmission logic are added to improve the reliability of the transmission process.The test results show that the system is based on the localized FPGA development platform and display control core module,which can realize video transmission with1920*1080@60Hz resolution and 6.25 Gbps link rate.The system works normally and the video transmission process is stable.Compared with the transmission system,the real-time performance and reliability of the transmission are greatly improved,which lays a foundation for the independent and controllable development of airborne core equipment.