基于背景矩阵减法的探地雷达杂波信号抑制方法研究

Study on ground penetrating radar clutter signal suppression method by background matrix subtraction

探地雷达是探测浅层地下目标并对其空间分布进行成像的重要地球物理方法之一,但在实测雷达剖面中,目标反射信号不可避免地会受到直达波和地面反射波等杂波信号的干扰。为了提高探地雷达数据解译的可靠性和准确性,需要对杂波进行抑制或去除。提出一种背景矩阵减法来抑制杂波信号,并通过两组仿真数据和两组实测数据示例与减平均道法、奇异分解法对杂波抑制效果进行对比分析,结果表明背景矩阵减法的效果明显优于减平均道法和奇异分解法,可以在保证有效信号不丢失,幅值和相位不失真的基础上,使杂波得到较好地抑制,有助于识别探地雷达剖面中目标信号的特征,提高数据解译准确性和可靠性。

Ground penetrating radar(GPR)is an important shallow geophysical method for detecting underground targets and imaging their spatial distribution.However,in the measured radar profile,the target reflection signal is usually interfered with by the clutters,such as direct waves and ground reflection waves.In order to improve the reliability and accuracy of the interpretation of GPR data,it is necessary to suppress or remove these clutters from the recorded radar signals.A background matrix subtraction method was proposed to suppress the clutter signal,and the clutter suppression effect was compared and analyzed through two sets of simulation data and a set of actual data examples,with those by the subtractive averaging method and the singular decomposition method.The result shows that the effect of the background matrix subtraction method is obviously better than those two methods.It can ensure that the effective signal is not lost,and the amplitude and phase are not distorted,so that the clutter is better suppressed.It is helpful to identify the target signal in the ground penetrating radar profile.The accuracy and reliability of data interpretation is also improved.