某型飞机下视显示器液晶化改装设计

Design of refitting some kind airplane head down display with LCD screen

由于某型飞机的下视CRT显示设备存在很多缺点,因此很有必要用具备很多优越性的液晶显示设备来替换它。本文设计了一套液晶显示原理设备,从原理上论证替换方案的可行性,并作出了实物。此套设备针对某型飞机下视显示设备非标准的模拟视频信号,首先经过一系列模拟预处理和A/D采样,然后采用FPGA对经预处理后的视频信号进行处理和存储,并通过CPLD驱动液晶显示屏,显示和某型飞机下视显示器相一致的画面。结果证明,替换方案切实可行,经过产品化后即可用于工程实践。

This article designs a LCD screen equipment to replace the HDD （head down display） for certain airplane as it exist several shortages. From the theoretical verification we made the actually product. Because the analog video signal in head down display is nonstandard, a series of analog pretreatment and A/D sampling is processed at the beginning, next we use FPGA to do data processing and storage, then drive the LCD display with CPLD, so accordant image with head down display of certain airplane is achieved and displayed. Testing results show that the replacement solution is applicable and can be applied in actual engineering after it has been made to real product.