.见识几种无线导航系统的天线先看ILS的天线位于跑道远端的LOC波束天线ILS Localizer 21-element dipole reflector antenna array, Runway 27R, EDDV Hanover/Langenhagen International Airport. The picture shows the back of the antenna system.位于跑道近端的GS波束天线Glideslope antenna array, Runway 09R, EDDV Hanover/Langenhagen International Airport. DME antenna for HDB DME above building.ILS由地面发射的两束无线电信号实现航向道和下滑道指引，建立一条由跑道指向空中的虚拟路径。Illustration of ILS localizer and glideslope emissions.Marker Beacon指点标(
