利用非线性拟合抑制前视探地雷达杂波

在前视探地雷达中,当点散射源位于照射区域与成像区域间时,其回波信号经合成孔径成像处理后将会在成像区域的边缘产生虚假的目标图像,增加雷达的虚警率,文中通过分析这类信号的特征,提出了一种抑制该类信号的杂波抑制方法。该方法利用顶点变化的抛物线Radon变换在参数空间获取杂波参数;利用非线性拟合方法重构杂波,实现杂波抑制。通过对实测数据进行处理,结果表明,所提杂波抑制方法很好地抑制了这类杂波,信杂比得到显著提高。

Clutter Reduction in Forward-looking Ground Penetrating Radar Using Nonlinear Curve Fitting

In Forward-Looking Ground Penetrating Radar(FLGPR),the backscattered echoes from the point scatterer between the illuminated area and the imaging(survey) area,will produce false target in imaged region edge after synthetic aperture imaging,thus increasing the false alarm rate.This paper proposes a method to reduce this kind of clutter based on their characteristics.The clutter reduction method uses apex shifted parabolic Radon transform to estimate the clutter parameter in the Radon domain.Then the clutter are reconstructed by nonlinear curve fitting.After that the clutter is removed by subtraction.The effectiveness of the approach is demonstrated by an experimental data set,which shows that the signal-to-clutter ratio of near-surface target is significantly increased.