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角反射器在合成孔径雷达(SAR)定标中作为无缘点目标被广泛应用。该文研究了角反射器表面粗糙程度对其雷达散射截面峰值影响。角反射器的粗糙表面由随机高斯面模拟,散射计算采用全波数值算法完成。计算结果确定了表面均方根高度对角反射器精度要求范围,并分析了一定表面均方根高度下角反射器散射定标精度与入射波频率之间的变化关系。实验数据验证了计算模型并得出结论,表面均方根高度小于0.1个波长时角反射器满足精度要求;固定相对均方根高度情况下,随着入射波频率增加其精度误差将增大。该文研究结论对角反射器用于RCS标定具有重要应用意义。
Corner reflectors are widely used as targets for missed targets in Synthetic Aperture Radar (SAR) calibration. In this paper, the effect of the surface roughness of corner reflector on the peak of its radar cross section is studied. The rough surface of the corner reflector is modeled by a random Gaussian surface, and the scattering calculation is performed using a full-wave numerical algorithm. The calculation results confirm the required range of the root mean square reflector accuracy of the surface and analyze the relationship between the calibration accuracy and the incident wave frequency of the reflector with the root mean square height at a certain surface. The experimental data validate the calculation model and conclude that the angular reflector satisfies the accuracy requirements when the root mean square height of the surface is less than 0.1 wavelength and the accuracy error increases with the increase of the incident wave frequency under the fixed root mean square height. The conclusion of this paper is of great significance for the application of corner reflector in RCS calibration.