利用改进的f-k滤波方法压制探地雷达中的线性干扰

doi:10.12263/DZXB.20200986

电子学报 ›› 2022, Vol. 50 ›› Issue (6): 1444-1450.DOI: 10.12263/DZXB.20200986

利用改进的f-k滤波方法压制探地雷达中的线性干扰

张力文, 聂俊丽

贵州大学国土资源部喀斯特环境与地质灾害重点实验室，贵州贵阳 550025

收稿日期:2020-09-06 修回日期:2021-04-30 出版日期:2022-06-25
- 通讯作者:
- 聂俊丽
- 作者简介:
- 张力文男，1998年出生于贵州省纳雍县.现为贵州大学国土资源部喀斯特环境与地质灾害重点实验室硕士研究生.主要研究方向为地球物理探测技术.E-mail: 995927008@qq.com
  聂俊丽（通讯作者）女，1976年出生于山西省原平市.现为贵州大学国土资源部喀斯特环境与地质灾害重点实验室副教授，硕士生导师.主要研究方向为地球物理探测技术和环境问题. E-mail: junlinienie@163.com
- 基金资助:
- 贵州大学引进人才科研 (贵大人基合字 (2014）62号); 陕煤集团重大项目 (2018SMHKJ-A-J-03); 干旱生态脆弱区煤炭基地生态修复与保护研究项目 (GJNY2030XDXM-19-03.2)

Suppression of Linear Interference Signal in GPR Profiling by Improved f-k Filtering Approach

ZHANG Li-wen, NIE Jun-li

Key Laboratory of Karst Environment and Geohazard, Ministry of Land Resource, Guizhou University, Guiyang, Guizhou 550025, China

Received:2020-09-06 Revised:2021-04-30 Online:2022-06-25 Published:2022-06-25
- Corresponding author:
- NIE Jun-li
- Supported by:
- Talent Introduction Project of Guizhou University (贵大人基合字 (2014）62号); Major Program of Shaanxi Coal and Chemical Industry Group Co., Ltd. (2018SMHKJ-A-J-03); Research Program on Ecological Restoration and Protection of Coal Base in Arid Ecologically Fragile Area (GJNY2030XDXM-19-03.2)

摘要/Abstract

摘要：

由倾斜界面产生的空间干扰在探地雷达剖面中表现为具有一定倾向的线性干扰，通常采用f-k滤波方法来压制线性干扰.然而，由于常规的f-k滤波方法采用FFT变换中的复共轭特征，对实际数据中存在的负视速度（负波数）信号没有特别关注和处理，对线性干扰的压制效果不理想，这对数据的解译有着很大的影响.为此，本文对f-k滤波方法进行改进，实施过程中对雷达数据经f-k变换之后，在负波数到正波数进行全域分析，区别压制实际数据中的负波数信号，而不仅限于压制正波数信号变换之后的对称负波数信号.改进之后的f-k滤波方法在模拟数据和实际生产数据中均能有效压制此类线性干扰，凸显探测目标.

关键词: 探地雷达, f-k滤波, 空间干扰, 线性干扰

Abstract:

The space interference generated by the inclined interface is a linear noise with a certain tendency in the GPR profile, and it can be suppressed by f-k filtering approach. Because the conventional f-k filtering method uses the complex conjugate feature of FFT transform, it does not pay special attention to and process the negative apparent velocity (negative wave number) signal in the actual data, and the suppression effect of linear interference wave is not ideal, which has a great impact on the data interpretation. Therefore, this study improves the f-k filtering method. In the process of filtering, this study analyzes the data of positive and negative wave number domain after f-k transformation of actual GPR data, and identifies and suppresses the positive and negative wave number signals in the actual data respectively. The improved f-k filtering method can effectively suppress the linear noise and highlight the detection target in both simulation data and actual production data.

Key words: ground penetrating radar, f-k filtering, space interference, linear noise

中图分类号:

P631.1

张力文, 聂俊丽. 利用改进的f-k滤波方法压制探地雷达中的线性干扰[J]. 电子学报, 2022, 50(6): 1444-1450.

Li-wen ZHANG, Jun-li NIE . Suppression of Linear Interference Signal in GPR Profiling by Improved f-k Filtering Approach[J]. Acta Electronica Sinica, 2022, 50(6): 1444-1450.

图/表 5

图1 探地雷达剖面中的倾斜线性干扰(a) 正视速度的下行干扰 (b) 负视速度的上行干扰

图2 数值模型

图3 数值模拟结果及f-k滤波对比

图4 岩溶洼地示意图

图5 岩溶探测数据及f-k滤波对比

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利用改进的f-k滤波方法压制探地雷达中的线性干扰

Suppression of Linear Interference Signal in GPR Profiling by Improved f-k Filtering Approach

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