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二维微波成像技术是一种有效诊断雷达目标散射点强度和空间分布的手段。机载共形天线因与机体表面成为一体,常规测试手段难以确定其RCS贡献。基于二维微波成像技术,分离和提取出了装机状态下共形天线的反射率分布,通过二维空间像与二维空间谱之间的波谱变换获得了共形天线的二维空间谱信息,经过直角坐标域至极坐标域的插值获得了对应频率和角度的散射信息,再对定标球进行同样的处理,最终标定出共形天线的RCS贡献。实验结果表明了该技术的有效性。
Two-dimensional microwave imaging technology is an effective means to diagnose the intensity and spatial distribution of scattering points of radar target. Airborne conformal antennas are difficult to determine their contribution to RCS due to their integration with the body surface. Based on the two-dimensional microwave imaging technique, the reflectivity distribution of the conformal antenna under the installed state is separated and extracted. The two-dimensional spatial spectrum information of the conformal antenna is obtained through the spectral transformation between the two-dimensional space image and the two-dimensional space spectrum. Through the orthogonal coordinate domain to the polar coordinate domain interpolation obtained corresponding frequency and angle of the scattering information, and then the calibration of the ball for the same treatment, the final calibration of the conformal antenna RCS contribution. The experimental results show the effectiveness of the technique.