专利名称：TRACKING THE POSITIONAL RELATIONSHIP
BETWEEN A BORING TOOL AND ONE ORMORE BURIED LINES USING A COMPOSITEMAGNETIC SIGNAL
发明人：John E. Mercer,Albert W. Chau申请号：US12139776申请日：20080616
公开号：US20080246483A1公开日：20081009
专利附图：
摘要：A boring tool is moved through the ground in a region which includes at least
one electrically conductive in-ground line and which is subject to static magnetic fieldsincluding 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
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