Accession Number : ADP004374

Title :   Development of the F-20 Nose Radome,


Personal Author(s) : Cain,E. L. ; Tulyathan,P.

Report Date : 1984

Pagination or Media Count : 10

Abstract : Northrop's newest fighter aircraft, the F-20 Tigershark, is based on the successful aerodynamic design and size of the F-5 Tiger II aircraft. It has a single engine providing 80 percent more thrust than that of the twin-engine Tiger II, digital avionics, and a newly designed AN/APG-67 (V) X-band radar. This coherent pulse-doppler radar provides both look-up and look-down target detection and tracking. Successful operation of this radar necessitated an antenna/radome system which provides low RMS side-lobe levels to minimize false alarm rate in the look-down mode, and high antenna gain/low radome loss to maximize radar range. These system requirements prompted a redesign of the F-5 'Shark Shape' nose section which had been aerodynamically configured to improve the post-stall handling qualities of the Tiger II aircraft. The design change included (1) provisions for a larger radar antenna, (2) a clean radome, i.e., no pitot-static probe, air lines or heater wires, and (3) a blunted radome shape, designed to preserve aerodynamic handling qualities and provide the required electrical characteristics.

Descriptors :   *Radomes, Aerodynamics, Antennas, Coherent radar, Doppler radar, Radar pulses, Electrical properties, Fighter aircraft, High gain, Radar antennas, Aircraft, Avionics, Digital systems, False alarms, Heaters, Wire, Shape, Engines, Radar, X band, Range(Distance), Level(Quantity), Sidelobes, Tracking

Distribution Statement : APPROVED FOR PUBLIC RELEASE