关键词: 雷达截面, 复射线理论, 场的展开

Abstract: The elementary principle and method of complex ray have been used for RCS analysis of a large aperture concave hollow target, such as an engine intake by wave expansion with a set of Gaussian beams. In this paper, a curved hollow duct as a model of an engine intake is calculated. The effectiveness and accuracy of the method can be proved from the comparison of the calculation with the measured results.

Key words: radar cross section (RCS), complex ray theory, expansion