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accuracy accurate aids airborne radar aircraft airplane airport airways altimeter altitude angle approach automatic axis azimuth beam beamwidth cathode-ray tube celestial navigation chart circuits components corner reflector course designed desired detect direction distance echoes electronic elevation energy equipment error factor flight flying frequency glide path ground track ground-based height horizontal identified increase indicator installation landing limited lobe Loran markers maximum Mc/sec measured meter method microwave modulation nautical miles navigation obtained operator output paraboloid pattern photograph pilot present problem pulse length pulse power radar beacons radar cross section radar set radar system radiation radio range radome receiver reflected relative relay repetition rate rotation scan scanner screen servomechanism ship shipborne shown in Fig signal speed station surface sweep switch synchronization target terrain tion traffic transmission transmitted vertical video mapping voltage waveguide wavelength waves width