Research On Key Technologies Of Display Control Based On Airborne Application

With the rapid development of avionics technology,the integration and complexity of avionics,flight control and electromechanical systems have been greatly improved.Modern sensors such as radar,photodetector,electronic warfare equipment,data link system and other equipment feedback information need to be more quickly and directly communicated to the pilot.Therefore,human-computer interaction is particularly important in the aviation display system.The optimization of human-computer interface makes the cockpit display control system more active,reduces the subjective error probability of flight,and increases the reliability and response speed of the aircraft.The functions of the display control system in the graphics processing chips used in the airborne field in our country are relatively simple.Advanced functions such as display splicing,stacking and zooming can only be realized by the way that the graphics processor chip is attached with FPGA,or by the way that the professional graphics processing chip that generates the display works together with the professional video chip that can realize the advanced functions This thesis analyzes the role and requirements of airborne display and control system,designs the display and control interface with single graphics processor chip scheme for airborne application environment,and solves the problem that when the existing graphics processing chips meet the high-level functional requirements of airborne cockpit display system for input video processing and overlay,there are many devices,large board area and weight,and the design of other methods Complex problems in design and Implementation.The display control interface designed in this thesis can meet the basic functions of single adjustment and output of all kinds of video and drawing image,and realize the high-level functions of superimposed output display between video and image,zoom,color,position adjustment of source video image and final display video image.The technical difficulties of displaying the design and implementation of the control interface include the architectural design and reliability design,and the design of the architecture is reasonably divided into functional modules and interconnection methods according to the various function characteristics supported,and IP reuse technology is used to reduce the complexity of the design.In the reliability design,the input module uses the technical scheme of filtering and cross-clock domain processing of the external input video signal,the fault tolerance design of row pixels and the full frame storage mechanism,and the technical scheme of the effective level polarity adaptation of the input video frame synchronization and row synchronization signal to ensure the fault tolerance.The output module uses a two-stage buffer structure of the forward buffer and the rear buffer.At the same time,the thesis designs the model display control driving software,models the link relationship and data interaction between the internal modules,makes the display control software interface definition can be used in any embedded device display control system without specifying the specific implementation,and solves the problems such as the current display control interface usage is not uniform,not convenient,the configuration is not flexible,the extensibility is not strong.The display control interface designed and implemented in this thesis has passed the hardware and software co-verification,and the function and performance all meet the requirements.