Design Of Airborne Video Processing System Based On ARINC818 Aeronautical Bus

As an important part of the avionics system,the airborne video processing system can record not only the external aerial scenes of the aircraft,but also the data of the display instruments in the internal cockpit of the aircraft.In tactical reconnaissance,security monitoring,meteorological monitoring,aircraft flight data analysis and other fields have a wide range of applications.However,at present,the aviation bus and coding technology used in the airborne video processing system are backward,and the number of channels is small,which can not meet the needs of airborne video processing brought about by the intelligent development of avionics system.In order to solve the above problems,this paper designs an airborne video processing system based on ARINC818 aviation bus,which is used for realtime airborne video processing of a certain type of artificial rain enhancement aircraft.This paper first introduces the research status of aviation bus technology and video coding technology at home and abroad,then studies the key technologies involved in the scheme,and analyzes and describes in detail the important theories such as fiber channel,FCAV protocol,ARINC818 protocol and related technologies of DM8168 platform.Then,according to the analysis of the design requirements of the airborne video processing system,the overall design scheme of the system using VPX architecture with FPGA and DM8168 as the core processor is proposed,and the composition and principle of the main module circuits in the system are analyzed and introduced.Then,on this basis,the specific functional modules of the system are designed and developed in two parts: FPGA and DM8168,in which FPGA is mainly responsible for video data reception,ARINC818 protocol analysis and video format conversion;DM8168 is mainly responsible for video time scale superposition,compression coding and data storage.Finally,the system software and hardware test environment is built,and the airborne video processing system based on ARINC818 is tested and verified in three aspects: playback test,compression ratio test and system high and low temperature test.The experimental results show that the airborne video processing system can realize the real-time acquisition,analysis,compression and storage of 4-channel ARINC818 format high-definition optical fiber video data for more than 6 hours.The system works stably and reliably,and can meet the needs of video data processing in artificial rain enhancement aircraft.At present,the system has been applied in artificial rain enhancement operation.