管道内部缺陷定位的一致性检验改进算法  

An Improved Consistency Check Algorithm for Positioning of Internal Pipeline Defect

作　　者：王泽根[1] 谭静[1,2] 刘蕾[3] 孙正超[1,2] 黄馃 

机构地区：[1]西南石油大学土木工程与建筑学院,四川成都610500 [2]四川省第三测绘工程院,四川成都610500 [3]四川科宏石油天然气工程有限公司,四川成都610213 [4]西南交通大学地球科学与环境工程学院,四川成都611756

出　　处：《测绘科学技术学报》2016年第4期336-340,共5页Journal of Geomatics Science and Technology

基　　金：四川省科技计划项目(2015SZ0046);四川省地理国情监测工程技术研究中心开放基金项目(GC201517)

摘　　要：针对管道内部缺陷定位中,里程轮累积误差较大的问题,提出了一种改进的一致性检验算法。在原有一致性检验的基础上,新定义了一种置信距离测度,消除了不同测量精度里程轮之间存在两种置信距离的情况,再利用阈值分辨出有效数据和较大误差定位数据,消除较大误差对定位结果的干扰。综合运用一致性检验和极大似然估计,进行管道内部缺陷检测定位分析,通过试验对比分析可知,新的一致性检验算法具有良好的抗干扰性,其平均相对定位误差为0.212%,有效减少了里程轮定位的累积误差,实现了管道内部缺陷检测的高精度定位,满足管道内检测的实际工程需求。For the accumulation error of odometer wheel in the internal pipeline defect positioning, an improved consistency check algorithm is proposed in this paper. On the basis of the original consistency check, a new confidence distance is defined. Through this, two confidence distances of two odometer wheels with different measurement accuracies are unified. The large error data and reasonable data are separated by threshold value and the interference of large error data can be removed. The improved consistency check algorithm and maximum likelihood estimation are combined for positioning analysis of internal pipeline defect. The tests show that the improved consistency check algorithm has a good anti-interference and the average relative positioning error is 0.212%. The accumulation error of positioning is reduced and the defect positioning accuracy is improved, meeting the practical engineering demand.

关 键 词：内检测 缺陷定位 里程轮 置信距离 支持矩阵 

分 类 号：P258[天文地球—测绘科学与技术]