EntityQ2110245· pop 10· linked from 57 articlesprimary radarSign in to saveradar sensor that illuminates a large portion of space with an electromagnetic wave and receives back the reflected waves from targets within that spaceConnectionsradiolocationEntitycommunications satelliteEntityradio broadcastingEntityradio navigationEntitysecondary surveillance radarEntityradioEntityradarEntityDoppler effectEntityInternational Telecommunication UnionEntityradio astronomyEntityair traffic controlEntityinstrument landing systemEntityradiosondeEntityemergency position-indicating radiobeaconEntityradio beaconEntityground stationEntityradio direction findingEntityradar altimeterEntitytransponderEntitybase stationEntityCategoriesRadarRadar theoryRadio stations and systems ITU