计算整机雷达散射截面的部件组合方法

本文应用部件组合方法结合相对相位综合技术计算丁某型战斗机的雷达散射截面(RCS)。部件组合方法是估算复杂形体目标RCS的一种有效方法,但同时也存在精度较差的不足。为解决这一问题,在分析计算中本文将真实目标等效为较多个部分典型几何体(如部分椭球,部分椭圆平板等)的组合,并首次应用准三维凹曲面作为典型散射体来替代战斗机的翼身融合过渡部分,从而使简单散射体的组合体较好地保持了原目标的散射特性。计算及其与测试结果的比较表明,本文采取的措施使部件组合法的计算精度有了很大改善,使之成为一种简便、省时、具有较高精度的估算整机RCS的有效方法。在全方位角范围内,计算与测试值的均方误差小于3dB,最大误差小于6dB。在IBM—4341机上用本文程序计算某型机在某一姿态角下的RCS(垂直和水平两种极化)分布曲线,只需约4分钟CPU时间。

Calculation of Radar Cross Section of an Aircraft Using Model Combination Method

By means of the technique of relative phase synthesis and the model combina tion method, the RCS of a fighter is calculated in this paper.Model combination method is an effective method for estimating the RCS of a target with complex configuration. But the accuracy of the method is not agreeable. In this paper, the real target is made equivalent to a combination of several different kinds of partial typical geometries, such as partial ellipsoid, partial elliptic plate and concave surface of quasi-three-dimension, which was originally used to represent the fighter's adaptive parts between fuselage and wings. In this way, the combination keeps well the scattering characteristics of the real target. Comparison between the results of calculation and that of measurement shows that the accuracy is greatly improved, and so the model combination method now can be considered not only simple and effective, but also precise. In the whole extent of azimuth, the mean square error between the results of calculation and that of measurement is less than 3dB and the maximum error is less than 6dB. Using IBM-4341 computer, the required CPU time for calculating a set of the fighter's RCS curves (vertical and horizontal polarization) is about 4 minutes.