专利名称：Tracking the positional relationship between
a boring tool and one or more buried linesusing a composite magnetic signal
发明人：John E. Mercer,Albert W. Chau申请号：US11074115申请日：20050307
公开号：US20050162169A1公开日：20050728
专利附图：
摘要：A boring tool is moved through the ground in a region which includes at leastone electrically conductive in-ground line and which is subject to static magnetic fields
including the magnetic field of the earth. Tracking a positional relationship between theboring tool and the line, as well as a directional heading of the boring tool within theregion are provided by: (i) generating a time varying magnetic field from the line; (ii) atthe boring tool, detecting a composite magnetic signal which includes one componentaffected by the static magnetic fields and another component affected by the timevarying magnetic field such that the static magnetic field component varies as a functionof the directional heading and the time varying component varies as a function of thepositional relationship; and (iii) processing the composite magnetic signal to separate thestatic magnetic field component and the time varying magnetic field component from thecomposite magnetic signal for use in determining the directional heading and thepositional relationship. In one feature, the static magnetic field component is used todetermine the directional heading of the boring tool and the time varying magnetic fieldcomponent is used to determine the positional relationship.
申请人：John E. Mercer,Albert W. Chau
地址：Kent WA US,Woodinville WA US
国籍：US,US
更多信息请下载全文后查看
因篇幅问题不能全部显示，请点此查看更多更全内容