连续波穿透雷达柱面成像的干涉条纹抑制研究

许圣志; 黄春琳; 刘涛; 覃尧; 陆珉

doi:10.11999/JEIT150274

连续波穿透雷达柱面成像的干涉条纹抑制研究

doi: 10.11999/JEIT150274

基金项目:

国家自然基金(61372160)

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出版历程
- 收稿日期: 2015-03-04
- 修回日期: 2015-07-07
- 刊出日期: 2015-11-19

A Study of Removing Interference Fringes on Cylindrical Subsurface Imaging with Continuous Wave Penetrating Radar

Funds:

The National Natural Science Foundation of China (61372160)

摘要

摘要: 在进行单频连续波表层穿透雷达的柱面2维无损检测成像扫描时，发现明暗相间的条纹现象，这是雷达成像扫描的一种主要干扰，会严重降低目标的成像效果。该文简单分析了曲面干涉条纹的产生机理，并且基于柱面与目标的谱域分布特性差异，提出谱域干涉条纹滤波方法。针对小目标具有较规律的谱域角度分布特性，沿角度进行谱域插值的补偿，以消除谱域滤波丢失目标谱信息的影响。此外，结合波前成像算法，给出了实现简单、处理高效的谱域滤波成像处理流程。通过仿真分析和实测数据实验，结果表明该文方法能够有效去除柱面的干涉条纹，形成清晰的目标图像。与传统的减平均方法的对比证实该文方法更有效。
- 连续波表层穿透雷达 /
- 干涉条纹 /
- 无损检测 /
- 柱面探测
Abstract: The interference fringe phenomenon appears when continuous wave subsurface penetrating radar is used to image on the uneven surfaces for nondestructive detection. As one of the main disturbances, the fringes will deteriorate the imaging results. The principle of this phenomenon is briefly studied and a filtering method to remove the fringes based on the distribution difference in frequency domain between cylindrical surfaces and target is proposed. Besides, according to the regular angle distribution of small target in frequency domain, a compensatory method by interpolation in a certain angle is studied to optimize the imaging results. Moreover, an effective imaging process for cylindrical subsurface detection based on the wavefront imaging algorithm is illustrated. The numerical and experimental data validate the applicability of proposed method and the results outperform the traditional approach of average subtraction.
- Continuous wave subsurface penetrating radar /
- Interference fringes /
- Nondestructive detection /
- Cylindrical subsurface detection

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