Clutter suppression for ground penetrating radar echo signal based on layer division processing

IF 2.1 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Hao Wan, Shuai Yang, Jixiong Xiao
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引用次数: 0

Abstract

To improve the accuracy of underground target identification, clutter must be efficiently suppressed in ground-penetrating radar(GPR) echo signal. Classic methods such as Robust Principal Component Analysis (RPCA) and Factor Group-Sparse Regularization (FGSR) have been widely applied in GPR signal processing. RPCA separates background and target signals based on low-rank and sparse decomposition. FGSR removes large-scale surface clutter using morphological operations. However, both methods face limitations under non-uniform subsurface conditions, where the background and target signals are highly complex and overlapping. Based on the characteristics of echo signal, a clutter suppression method is proposed, namely adaptive layer division processing combined with two-dimensional wavelet transform. A Peplinski's heterogeneous soil model containing underground targets is constructed in gprMax to evaluate the effectiveness and applicability of the proposed method. By analyzing the statistical properties of kurtosis and skewness, adaptive layer division processing is applied to preliminarily separate the direct wave, background clutter, and target echo reflection signals. The two-dimensional wavelet transform is then applied to suppress clutter in the target signal layer, and the final image is reconstructed. Simulation results show that adaptive layer division processing enhances the clutter suppression performance of conventional denoising methods. The proposed method, integrating two-dimensional wavelet transform, demonstrates superior clutter suppression performance, where the signal-to-clutter ratio (SCR) is improved to 15.45 dB, the image entropy is reduced to 2.51, the improvement factor (IF) achieves a positive value of 1.63 dB, and the peak signal-to-noise ratio (PSNR) rises to 27.63 dB. The proposed method provides an effective approach for processing GPR echo signals under non-uniform subsurface conditions.
基于分层处理的探地雷达回波信号杂波抑制
为了提高地下目标识别的精度,必须有效地抑制探地雷达回波信号中的杂波。鲁棒主成分分析(RPCA)和因子群稀疏正则化(FGSR)等经典方法在探地雷达信号处理中得到了广泛的应用。RPCA基于低秩和稀疏分解分离背景和目标信号。FGSR使用形态学操作去除大规模表面杂波。然而,在非均匀的地下条件下,背景和目标信号高度复杂且重叠,这两种方法都存在局限性。根据回波信号的特点,提出了一种杂波抑制方法,即结合二维小波变换的自适应分层处理。在gprMax中构建了包含地下目标的Peplinski非均质土模型,以评价该方法的有效性和适用性。通过分析峰度和偏度的统计特性,采用自适应分层处理对直波、背景杂波和目标回波反射信号进行初步分离。然后利用二维小波变换抑制目标信号层的杂波,重构最终图像。仿真结果表明,自适应分层处理提高了传统去噪方法的杂波抑制性能。该方法通过二维小波变换的积分,使图像的信杂波比(SCR)提高到15.45 dB,图像熵降低到2.51,改进因子(IF)达到正值1.63 dB,峰值信噪比(PSNR)提高到27.63 dB,具有良好的杂波抑制性能。该方法为非均匀地下条件下探地雷达回波信号的处理提供了有效途径。
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来源期刊
Journal of Applied Geophysics
Journal of Applied Geophysics 地学-地球科学综合
CiteScore
3.60
自引率
10.00%
发文量
274
审稿时长
4 months
期刊介绍: The Journal of Applied Geophysics with its key objective of responding to pertinent and timely needs, places particular emphasis on methodological developments and innovative applications of geophysical techniques for addressing environmental, engineering, and hydrological problems. Related topical research in exploration geophysics and in soil and rock physics is also covered by the Journal of Applied Geophysics.
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