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引言本文分析了正切卵形天线罩对装有孔径天线的单脉冲雷达定向误差(RPE)的影响。分析中,假设天线处于接收状态;除了考虑直接透过天线罩入射到天线口径的场之外,还考虑了经天线罩内壁一次反射进入天线口径的场;忽略了顶点散射和表面波的影响;认为入射波为平面波,而且在局部上将天线罩近似为平板,并应用射线描迹法求出透射场和反射场,从而求得天线罩的瞄准误差BSE。分析表明,由天线罩引起的、天线口径场相对于入射场的畸变反映了BSE,而这种畸变与入射角和极化状态有关;由于入射极化的不对称,使得除存在扫描平面的BSE以外还存在正交平面的BSE。作为实例,本文分析了长细比为3的等壁厚天线罩。发现,在入射方向偏离天线罩轴15～25。的范围内,天线罩内壁的反射对BSE的影响很大,通过降低天线口径边缘的照射电平可以减少这种影响。
Introduction This paper analyzes the effect of a tangential oval radome on the monopulse radar directional error (RPE) with an aperture antenna. In the analysis, it is assumed that the antenna is in the receiving state. In addition to the field directly incident on the antenna aperture through the radome, a field reflected by the inner wall of the radome into the antenna aperture is also considered; the influence of the peak scattering and the surface wave is ignored; It is considered that the incident wave is a plane wave, and the radome is approximated as a flat plate locally, and the transmission field and the reflection field are obtained by ray tracing method to obtain the BSE of the radome. The analysis shows that the distortion of the antenna aperture field relative to the incident field caused by the radome reflects the BSE, and this distortion is related to the incident angle and the polarization state. Due to the asymmetry of the incident polarization, the BSE except the scanning plane exists In addition there is an orthogonal plane BSE. As an example, this paper analyzes the wall thickness radome with a slenderness ratio of 3. It was found that it deviated from the radome shafts 15 to 25 in the incident direction. , The reflection of the inner wall of the radome has a great influence on the BSE. This effect can be reduced by lowering the radiation level at the edge of the antenna aperture.