1·Radar apparatus, radio navigational aid apparatus and radio remote control apparatus.
雷达设备、无线电导航设备及无线电遥控设备。
2·The utility model relates to a free-floating light beacon of navigational aid on water in the sea, a river, or a harbor.
本实用新型是一种海、河港口用水上助航活节式灯桩。
3·A radio navigational aid for determining the distance from a selected DME ground station by measuring the time of transmission to and from it.
飞机上的一种无线电导航设备，通过测量电波往返飞机和预选地面（DME）台之间所需要的时间来确定两者间的距离。