中文摘要：

探地雷达应用中，由于土壤介质的影响，不同位置目标回波延时常常存在波动，传统的恒定波速成像算法不能修正这种波动，难以使成像性能达到最优。该文提出一种根据目标回波的曲线特征，快速估计横向等效波速，采用变波速F-K偏移进行合成孔径精确成像的新方法。实测数据处理结果显示该方法性能优于恒定波速成像。

英文摘要：

The object＇s echo time delay often fluctuates in ground-penetrating radar （GPR） application due to the effect of soil. Such fluctuation can hardly be amended using the traditional algorithm with constant velocity to get the optimum image. A new method for precise SAR imaging is proposed by using the lateral variable velocity F-K migration in this paper. The equivalent lateral velocity can be fast estimated by the hyperbolic signatures of the echo. Experimental results show that the proposed method is more effective than the constant velocity migration.