Aircraft electronic landing responser system using scanning pencil beam ground antenna

摘要: An electronic approach and landing aid system involving the use of an airborne interrogator a ground station having rapid elevation frequency scan somewhat slower azimuth phase planar array. Each interrogating pulse produces chirp at each one complete cycle pencil beam formed by Elevation angle data is air derived from energy as it passes across aircraft, range determined in proportion to time between pulses corresponding replies. Azimuth position antenna separately supplied through independent modulation which correspondingly decoded air.