초록 ▼

Geographical positional data is obtained for an underground object by locating the object using a device that locates underground objects. An apparatus that receives data from a global position system (“GPS”) provides data identifying global position of the device, and thus also of the located under

Geographical positional data is obtained for an underground object by locating the object using a device that locates underground objects. An apparatus that receives data from a global position system (“GPS”) provides data identifying global position of the device, and thus also of the located underground object. A data storage unit stores such positional data, which may be used in the future to re-locate the underground object. The GPS-data receiving apparatus can preferably receive data from at least one overhead GPS satellite and from a secondary stationary receiver. Data from the secondary stationary receiver may be modulated on to a signal transmitted along a detected underground cable object.

대표청구항 ▼

An underground cable locating device including: underground cable locating means for locating an underground object, the means including two detection coils for detecting a magnetic field produced by a current passing through the underground cable; positional data receiving means for receiving data

An underground cable locating device including: underground cable locating means for locating an underground object, the means including two detection coils for detecting a magnetic field produced by a current passing through the underground cable; positional data receiving means for receiving data from a Global Positioning System (GPS) relating to the geographical position of the locating device, including means for receiving data from both at least one overhead GPS satellite and a second stationary receiver; data storage means (12) for storing data relating to the position of the underground object as determined by the geographical position of the locating device; and means for receiving data from the stationary receiver that has been modulated on to a signal that is transmitted along the underground cable detected by the locating device, said means including two detection coils for detecting the magnetic field produced by a current passing through the underground cable.