基于稀疏特性的地下管线电磁散射高效算法研究

项目名称： 基于稀疏特性的地下管线电磁散射高效算法研究

项目编号： No.61261005

项目类型： 地区科学基金项目

立项/批准年度： 2013

项目学科： 无线电电子学、电信技术

项目作者： 刘志伟

作者单位： 华东交通大学

项目金额： 40万元

中文摘要： 目前地下管线已成为城市赖以生存的物质基础，研究地下管线的探测方法，在城市的改建、扩建工程中，能够避免因管理分散带来的各类安全事故，具有重大的意义。探地雷达具有高效、无损、高分辨率的特点，是当前地下管线探测中最具吸引力的研究方向。通常地下环境具有不规则的层状结构，且媒质呈现不均匀的特点，使传统探地雷达技术探测地下管线时，存在难以识别、精度不高的问题。本课题拟研究积分类数值算法，精确计算地下管线的电磁散射，进而建立管线的电磁散射特征库，提高管线的探测精度。针对数值算法中计算复杂度高的难题，利用地下管线耦合场、散射场中蕴含的稀疏性，研究更为高效的混合算法，从根本上降低数值算法的计算时间。数值仿真和外场测量相结合，改进理论研究结果。课题的研究将为地下管线的精确探测提供理论依据、仿真数据和实验验证。

中文关键词： 散射；地下管线；矩量法；自适应交叉近似；粗糙面

英文摘要： Nowadays, the buried pipes play an important role for our modern city. In order to avoid the accidents caused by confused management in city updating and expansion, it is necessary and meaningful to research on detection method for buried pipes. Since the merit of ground penetrating radar is efficient, non-destructive and high resolution, it becomes the most attractive research field for detection of buried pipeline. However, the irregular layered soil and the inhomogeneous meida make the underground environment much complex. Accordingly, it is inaccurate for traditional ground penetrating radar to detect the underground pipes. This issue aims at exploring new numerical algorithms for accurate calculation of scattering from buried pipes. An EM scattering feature library of buried pipeline will be built by new numerical algorithms and used to improve the results of pipeline detection. In order to further reduce the computation complexity, the sparse property of coupling and scattering field is exploited to generate more efficient algorithms. The EM theory of underground pipeline is able to be verified and improved by both of the simulation and experiment. The study of this issue will provide the theory, simulation and experimental verification for accurate detection of buried pipes.

英文关键词： Scattering；Underground pipeline；Moment method；Adaptive cross approximation；rough surface