連續(xù)波穿透雷達(dá)柱面成像的干涉條紋抑制研究

許圣志; 黃春琳; 劉濤; 覃堯; 陸珉

doi:10.11999/JEIT150274

連續(xù)波穿透雷達(dá)柱面成像的干涉條紋抑制研究

doi: 10.11999/JEIT150274 cstr: 32379.14.JEIT150274

基金項(xiàng)目:

國家自然基金(61372160)

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出版歷程
- 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: 在進(jìn)行單頻連續(xù)波表層穿透雷達(dá)的柱面2維無損檢測成像掃描時(shí)，發(fā)現(xiàn)明暗相間的條紋現(xiàn)象，這是雷達(dá)成像掃描的一種主要干擾，會(huì)嚴(yán)重降低目標(biāo)的成像效果。該文簡單分析了曲面干涉條紋的產(chǎn)生機(jī)理，并且基于柱面與目標(biāo)的譜域分布特性差異，提出譜域干涉條紋濾波方法。針對(duì)小目標(biāo)具有較規(guī)律的譜域角度分布特性，沿角度進(jìn)行譜域插值的補(bǔ)償，以消除譜域?yàn)V波丟失目標(biāo)譜信息的影響。此外，結(jié)合波前成像算法，給出了實(shí)現(xiàn)簡單、處理高效的譜域?yàn)V波成像處理流程。通過仿真分析和實(shí)測數(shù)據(jù)實(shí)驗(yàn)，結(jié)果表明該文方法能夠有效去除柱面的干涉條紋，形成清晰的目標(biāo)圖像。與傳統(tǒng)的減平均方法的對(duì)比證實(shí)該文方法更有效。
- 連續(xù)波表層穿透雷達(dá) /
- 干涉條紋 /
- 無損檢測 /
- 柱面探測
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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