ANGULAR ANTENNA ERRORS DUE TO AERODYNAMIC HEATING OF THE RADOME.
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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Diffraction error in airborne antennas due to aerodynamic heating of the radomes is discussed. During aerodynamic heating, the radome surface temperature varies as a function of the distance along the randome generatrix, which leads to nonuniform changes in the electrical thickness of the radome. Deviations in the electrical thickness were calculated for all points on the radome by considering the radomes geometrical thickness and the beam incidence angle on the radome. As an example, the angular error was calculated for an ogival, monolithic half-wave ceramic radome at a flight speed of Mach 6 and for a wavelength of 0.03 m. The obtained results show that the angular error of the radar beam position for supersonic flight speeds can be intolerably large, and that it has to be considered in the development of special radar systems with high angular accuracy for determining the targets angular coordinates.
- Electrical and Electronic Equipment