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accuracy accurate aids airborne radar aircraft airplane airport airways altimeter altitude approach automatic azimuth beacon signals beamwidth cathode-ray tube chart circuits components corner reflector coverage cursor designed desired detect devices direction distance distortion echo elevation sweep energy equipment error factor flight flying frequency glide path ground track height horizon identify increased indicator installation isec land limited lines of position lobe Loran Mc/sec measurement method microwave modulator mount nautical miles navigation obtained operator pattern photographs pilot possible present problem pulse length pulse power radar antenna radar beacons radar cross section radar set radar system radiation radio range radome receiver reflected relay repetition rate rotating scan scanner screen servomechanism ship shipborne shown in Fig slant range slant-range speed station surface sweep switch synchronizer target techniques tion transmission transmitted vertical video mapping voltage waveguide wavelength width