一种新型飞机座舱电子水平状态仪的研制

 分析了某型飞机座舱电子水平状态仪( EHSI: Electronic Hor izontal Situation I ndicator ) 所显示画面的特点及研制难点, 给出了一种基于新型帧存结构的EHSI 图形显示系统设计方案, 该方案具有双缓冲交替切换和自动消隐的特点, 可以使EHSI 的罗盘画面生成的时间缩短约1/ 3, 并借鉴电影遮光板的原理, 采取单帧双扫显示方式, 使系统视频带宽增加1 倍, 这些设计方法加快了图形生成速度, 解决了在EHSI 设计中的速度瓶颈。详细介绍了该系统的组成结构和用FPGA 实现视频控制器、自消隐帧存控制器的设计方法。

Design of a New Electronic Horizontal Situation Indicator in Aircraft Cockpit

The feature of graphics of EHSI(Electronic Horizontal Situation Indicator) in aircraft cockpits and the difficulties in development are introduced,and a new design scheme of EHSI graphics display system based on a new structure of frame buffer is presented,which has characteristics of double frame buffer alternation and automatic vanishing screen,and can make the time needed for generating aircraft compass graphics shorten by one third;furthermore,referring to the principle of movie shade,it controls the system to display on the one frame two display mode, which can double the system bandwidth. Those design methods reduce the burden of the main processor greatly, improve the speed of graphics generation,and solve the bottleneck of speed in the design of EHSI. The system structure and the design methods of the video controller and the frame buffer controller with FPGA are detailed.