基于电磁计算的非平整表层回波抑制方法

全息穿透成像雷达对介质表面不平整较为敏感，特别是对于高程差与波长相比拟的介质而言，介质表层反射的回波将掩埋目标回波或形成虚假目标，影响对埋藏目标的准确探测。针对该现象，本文提出了一种基于电磁计算的非平整表层回波抑制方法，该方法根据介质表面高程，利用电磁计算方法拟合非平整表层回波，经过幅度和相位适应校准后，再与包含表层影响的实测回波数据对消，实现非平整表层回波抑制，进而实现有效成像。实验结果验证了本文方法的有效性。

Echo Suppression Method of Uneven Surface Based on Electromagnetic Calculation

Holographic subsurface imaging radar is sensitive to the unevenness of medium surface, especially for medium whose elevation difference is similar to wavelength. The echo reflected from the surface of the medium will bury the target echo or form a false target, which will affect the accurate detection of the buried target. Aiming at this phenomenon, an echo suppression method based on electromagnetic calculation is proposed in this paper. According to the surface elevation of the medium, electromagnetic calculation method is used to fit the uneven surface echo. After amplitude and phase adaptation calibration, it is cancelled with the measured echo data affected by the surface layer to achieve surface echo suppression, and then achieve effective imaging. Experimental results verify the effectiveness of the proposed method.