1.引言 本报告报导数字一视频转换器的设计和制造。这种转换器从数字计算机接收数据,并将这些数据转换成标准的525线电视显示格式。该系统是为直升机低空飞行研究而设计的,并将要在航空电子设备研究（EVAR）实验飞行器上进行飞行试验。该飞行器是一架CH—53直升机,备有各种仪表,专供航空电子设备研究和发展计划使用。 军用飞机在白天和黑夜条件下进行超低空飞行时,要求驾驶员知道前方的地形特点。目前,低空飞行是由专门从事驾驶 1. Introduction This report reports on the design and manufacture of digital-to-analog video converters. This converter receives data from a digital computer and converts the data into a standard 525-line television display format. The system is designed for low-altitude helicopter flight research and will be tested on an avionics research aircraft (EVAR) flight test. The aircraft is a CH-53 helicopter equipped with a variety of instruments designed for avionics research and development programs. Military aircraft during ultra-low altitude flights under day and night conditions require pilots to be aware of the terrain features in front of them. At the moment, low-altitude flights are specialized in driving