非均质土壤中直埋式电缆的精确定位技术研究

Direct Burial Cable Reconstruction Framework for Accurate Positioning in Heterogeneous Soil

近年来,探地雷达在地下电缆成像中得到了广泛的应用。然而,由于非均质土壤介电参数呈现随机性和复杂性等特征,使用单个相对介电常数来表征整个成像区域内土壤电学特性将会向成像结果中引入较大误差。如何精确表征土壤的介质特性,进而实现对直埋式电缆的精准定位仍然是亟待解决的问题。为此提出了一种改进的方法对地下管线类目标进行重建。该方法基于列聚类算法以及改进的Hough变换技术,提取了各管线目标的双曲线特征,针对每个目标所在区域适应性地构建土壤介电模型,并结合背向投影成像算法分别对单个目标进行重构;最后将各重构目标进行融合,实现对地下多根电缆的精细化重构。与传统方法相比,改进的方法具有更好的准确性与定位精度。

In recent years,GPR has been widely used in underground cable imaging.However,due to the randomness and complexity of dielectric parameters of heterogeneous soil,using a single relative dielectric constant to characterize the electrical characteristics of soil in the whole imaging area will introduce large errors into the imaging results.How to accurately characterize the medium characteristics of soil and realize the accurate positioning of directly buried cables is still an urgent problem to be solved.Therefore,an improved method is proposed to reconstruct underground pipeline targets.Based on the column clustering algorithm and the improved Hough transform technology,the hyperbolic characteristics of each pipeline target are extracted,the soil dielectric model is adaptively constructed for each target area,and the single target is reconstructed combined with the back projection imaging algorithm.Finally,the reconstruction targets are fused to realize the fine reconstruction of multiple underground cables.Compared with the traditional method,the improved method has better accuracy and positioning accuracy.