基于探地雷达频谱反演法的薄层识别技术研究
doi: 10.3724/SP.J.1146.2009.01511
Research on Thin-layer Recognition Technique Based on the Spectrum Inversion Method of Ground Penetrating Radar
-
摘要: 衡量探地雷达对薄层的识别能力通常有两个指标：最小可识别层厚和反射系数的识别精度。该文提出的频谱反演法，通过对电磁波在多层介质中频谱传输函数的推导，得出回波频谱的正演计算模型，然后采用阻尼最小二乘法进行二参数反演。通过实验，证实了这种方法能够对层厚小于八分之一波长的薄层进行层厚和反射系数的有效识别。Abstract: Two parameters are normally employed to evaluate recognition ability of the Ground Penetrating Radar (GPR) for the thin-layer: the least recognition thickness and the reflectance recognition precision. In this paper, the spectrum inversion method is used to improve the recognition ability of the GPR. The spectrum transmission function of the multilayer media is firstly deduced, and the forward model of the reflecting wave spectrum is obtained. Then the two parameters are inversed by using the damp least-squares algorithm. The experiment demonstrates that the method can identify the layer effectively with a thickness less then one-eighth wavelength.
-
Key words:
- Ground Penetrating Radar (GPR) /
- Thin-layer /
- Thickness /
- Reflectance coefficient /
- Spectrum inversion
-
[1] 黄饶, 陈小宏, 李景叶. 层间多次波模拟与影响分析[J]. 地球物理学进展, 2009, 24(3): 981-987. [2] Seyed Alireza Tabatabaeenejad. Forward and inverse models of electromagnetic scattering from layered media with rough interfaces[D]. [Ph.D. dissertation], Ann Arbor: Michigan University, 2008. [3] 张蓓. 路面结构层材料介电特性及其厚度反演分析的系统识别方法[D]. [博士论文], 重庆: 重庆大学, 2003. [4] De Voogd N and Den Rooijen H. Thin-layer response and spectral bandwidth [J].Geophysics.1983, 48(1):12-18 [5] 陈先红. 基于叠前资料道集上的远近偏移距属性差异的薄层识别[J]. 油气地球物理, 2008, 6(4): 51-55. [6] 袁明德. 浅析探地雷达的分辨率[J]. 物探与化探, 2003, 27(1): 28-32. [7] Lin Z W, Zhang X J, and Fang G Y. The second-order SPM solution for scattering from multi-layer dielectric media with slightly rough surface[C]. PIERS Proceedings, Moscow, Russia, Aug. 18-21, 2009: 1387-1390. [8] Weng Cho-Chew. Waves and Fields in Inhomogeneous Media [M]. NewYork: Van Nostrand Reinhold, 1990: 45-55. [9] 张建华，刘振华，仵杰. 电法测井原理与应用[M]. 西安: 西北大学出版社, 2002: 189-193. [10] 刘国林. 非线性最小二乘与测量平差[M]. 北京: 测绘出版社, 2002: 12-13. -
计量
- 文章访问数: 4089
- HTML全文浏览量: 84
- PDF下载量: 672
- 被引次数: 0
下载:
