一种用于电缆定位的地下电磁波速计算方法  

A Calculation Method of Underground Electromagnetic Wave Velocity for Cable Positioning

作　　者：黄继盛 郭平 项恩新 李伟[3] 唐凌云 蔡正杰 Huang Jisheng;Guo Ping;Xiang Enxin;Li Wei;Tang Lingyun;Cai Zhengjie(Lincang Power Supply Bureau,Yunnan Power Grid Corporation,Lincang 677000,China;Power Grid Research Institute of Yunnan Power Grid Corporation,Kunming 650011,China;State Key Laboratory of Functional Materials for Informatics,Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Science,Shanghai,201800,China;HYlight Technology.Co.,Ltd.,Shanghai,201800 China)

机构地区：[1]云南电网有限责任公司临沧供电局,云南临沧677000 [2]云南电网有限责任公司电力科学研究院,云南昆明650011 [3]中国科学院上海微系统与信息技术研究所,上海201800 [4]上海中光华研科技公司,上海200050

出　　处：《云南电力技术》2022年第5期74-78,共5页Yunnan Electric Power

摘　　要：基于时域有限差分法,对不同介电常数的土壤介质和不同半径的地下目标圆柱进行了模拟,得到了正双曲面图像。采用自适应高斯阈值算法提取外观特征,用最小二乘法对双曲线信号进行拟合,得到地下目标的位置和半径等信息。本文介绍并研究了3种不同的波速计算方法。结果表明,基于双曲线拟合系数的波速计算方法稳定性较差,在不同土壤介质和不同半径地下目标的介电常数下,计算结果与理论值有较大偏差。双曲线各点的加权波速计算值与理论值接近。Based on the finite difference time domain method,the soil media with different dielectric constants and the underground target cylinders with different radii are simulated to obtain the forward hyperbolicsignal image.The adaptive Gaussian threshold algorithm is used to extract the appearance feature.The hyperbolic signal is fitted by the least square method in order to achieve the inverse information including the location and radius of the underground target.Three different wave velocity calculation methods are introduced and studied in this paper.The results show that the method of calculating wave velocity based on hyperbolic fitting coefficients is poor in stability,and the calculated results deviate from the theoretical value under the different permittivity of soil medium and underground targets with different radii.Meanwhile the calculated values obtained by weighted wave velocities at each point of the hyperbola are close to the theoretical ones.

关 键 词：自适应高斯阈值法 最小二乘法 波速加权算法 时域有限差分法 

分 类 号：TM74[电气工程—电力系统及自动化]