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缝隙散射是隐身飞机散射的重要组成部分,很多文献进行了缝隙散射的研究,但都未给出小角域(-30°~30°)入射时缝隙散射的结果。将基于叠加原理的载体对消方法应用于缝隙散射源的电磁散射计算中,可以更精确地研究缝隙的电磁散射特性。通过单缝隙板的一维成像验证了载体对消方法的有效性和准确性,然后研究了在10GHz频率下,缝隙散射在小角域内随宽度、长度的变化规律,以及极化特性。不同缝隙宽度的研究结果表明:在小角域内,当缝隙宽度小于四分之一波长时,水平极化下缝隙散射比垂直极化下大,而当缝宽大于四分之一波长时,水平极化下缝隙散射比垂直极化下小;当缝宽增大时,缝隙在垂直极化下的雷达散射截面(RCS)增长速度更快。不同缝隙长度结果表明:在小角域内,缝隙电磁散射均值随着缝隙长度(200~1000 mm)的增加而增加,散射均值的大致范围:-22.2~-8.4d Bsm(水平极化),-27.3~-13.3 d Bsm(垂直极化);在小角域内,两种极化下,可拟合出RCS均值与缝长的关系,得到某一缝长的RCS,可计算出不同缝长对应的RCS的大致范围。
Slit scattering is an important part of the scattering of stealth aircraft. Many papers have done research on the scattering of the slit, but none of them gives the result of the scattering at the small angle (-30 ° ~ 30 °). The method of carrier cancellation based on superposition principle is applied to the electromagnetic scattering calculation of the slit scattering source, so that the electromagnetic scattering characteristics of the slit can be studied more accurately. The validity and accuracy of the carrier cancellation method are verified by one-dimensional imaging of a single slit plate. Then the variation of slit scattering along the width and length at 10 GHz and the polarization characteristics are studied. The results of different slit widths show that when the slit width is less than one-quarter wavelength, the slit scattering under horizontal polarization is larger than that under vertical polarization in the small-angle domain. When the slit width is greater than one-quarter wavelength, The scattering under the slit is smaller than that under the vertical polarization. When the slit width is increased, the RCS under the vertical polarization grows faster. The results of different gap lengths show that the mean value of the scattering mean increases from -22.2 to -8.4d Bsm (horizontal polarization), -27.3 (horizontal polarization) in the small-angle domain as the gap length increases (200-1000 mm) ~ -13.3 d Bsm (vertical polarization); in the small angle domain, under the two kinds of polarization, the relationship between the mean RCS and the length of the seam can be fitted to obtain a certain length of the RCS, the RCS The approximate range.