基于球面孔径合成成像的RCS测试方法研究

该文提出了一种基于球面孔径合成成像的雷达散射截面积（Radar Cross Section，RCS）测试方法，建立了基于去相干函数的回波信号模型，推导了基于球面孔径合成成像的RCS反演方法。首先，通过球面孔径合成三维成像方式获取被测目标的全方位-俯仰散射信息；其次，利用改进去相干函数的三维波数域积分成像处理方法获得目标的三维单视复图像，通过图像空域滤波抑制干扰目标信息；最后，通过波数域变换反演目标的RCS。该文引入去相干函数有效抑制了角度去相干和频域去相干效应对成像和RCS反演的影响，表征了目标方位-俯仰向RCS的幅度特性和相位特性，理论推导、仿真实验与数值分析均验证了该文方法的正确性和有效性。 

Research on RCS Test Method Based on Spherical Aperture Synthetic Imaging

This paper proposes a radar cross section （RCS） test method based on spherical aperture synthetic imaging， establishes an echo signal model based on decoherence function， and derives an RCS inversion method based on spherical aperture synthetic imaging. First， all the azimuth-pitch scattering information of the measured target is obtained through the spherical aperture synthetic three-dimensional imaging method； Second， the three-dimensional single looking complex （SLC） image of the target is obtained by three-dimensional wavenumber domain integral imaging processing method of improved decoherence function， the information of interference target is suppressed by image spatial filtering； Finally， the RCS of the target is inverted through wavenumber domain transformation. This paper introduces the decoherence function to effectively suppresses the effects of angle decoherence and frequency domain decoherence on imaging and RCS inversion， the conclusion of the method characterizes the amplitude characteristic and phase characteristic of the RCS of the target in the azimuth-pitch direction， theoretical deduction， simulation experiment and numerical analysis verify the correctness and effectiveness of the method in this paper.