无线电高度表测量的是飞机离地面而不是离海平面的距离，用于自动导航及仪表着陆系统上。
Radio altimeters measure the distance of an aircraft above the ground rather than above sea level, they are used in automatic navigation and Blind-landing systems.
低空无线电高度表，一种测量飞机至地形的垂直距离的系统。
LOW RANGE RADIO ALTIMETER, a system that measures the vertical distance from the airplane to the terrain.
从无线电高度表工作原理的分析与研究出发，提出了基于虚拟仪器技术和I/Q调制器的无线电高度表动态测试系统的总体设计，同时对测试数据的处理理论进行了一定的分析和研究。
This paper analyzes the working mechanism of aerodynamic missile-borne radio altimetre and puts forward a new design for the radio altimetre based on virtual instrument and I/Q modulator.
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