After the GPR data from exploration of Shanghai-Nanjing railway subgrade is filtered with the method mentioned above, it is easier for the GPR plot based on it to reflect the subgrade problems.

• 本文运用铁路沪宁线路基检测的数据，使用该方法滤波，其处理后的剖面更能有效地反映出路基病害的信息。