Research And Implementation Of Airborne Video Processing And Graphics Generating System On FPGA

Airborne cockpit display system is designed to provide the pilot with suitable, timely and accurateinformation flexibly. It’s one of the most important human interfaces between the pilot and the aircraftsystem, as well as the surrounding environment. The video processing and graphics generating systemdesigned in this paper is the key part of the “airborne graphics display system”, which is apre-research project of the AVIC Optronics. The whole project aims to build a flexible, reconfigurableand integrated cockpit display system.The whole system is built and realized on FPGA. The external video signal is collected andprocessed.Meanwhile, the graphics commands are received from upper software to generate thecorresponding flight graphics. Firstly, the design and implemention of video processing module basedon FPGA is elaborated in this paper, including video capture, video scaling, frame rate up-convertionand video output module.Secondly, the generation and anti-aliasing algorithms of each basic graphicsare discussed. An improved measure of anti-aliasing algorithm for lines is proposed in this paper toimprove the display quality of small angle lines. Moreover, a graphics buffer is intoduced in thismodule to divide the calculation operations from storage operations, which greatly accelerates thestorage speed of graphics. Finally, the external memory management module is analyzed in this paper.A rapid interrupt mechanism is proposed to solve the conflits of various read/write requests to theexternal memory.The results of experiments show that the system can fulfill the task of video processing and graphicsgeneration rapidly. The anti-aliasing algorithms used in this paper improved the display performanceeffectively. In conclusion, the system designed in this paper meets the display quality and processingspeed requirements of airborne cockpit display system well.