在民航导航设备中,为民航飞机提供方位引导的多普勒全向信标(DVOR)系统,使用了多普勒效应的方法对导航信号进行调频发射,使位于导航台不同方位的飞机收到后。有不同的相位,飞机由此可以判断自身相对于导航台的磁方位。这种对信号的调制方法不同于通信系统,主要的差别是: In civil aviation navigation equipment, directional navigation Doppler omnidirectional beacon (DVOR) system is provided for civil aviation aircraft, and the Doppler effect method is used to transmit the navigation signal by frequency modulation so that aircraft located in different azimuths of the navigation station receive Rear. There are different phases, the aircraft can thus determine its relative to the navigation station magnetic azimuth. This signal modulation method is different from the communication system, the main difference is: