DISTINGUISHING FALSE SIGNALS IN CABLE LOCATING
First Claim
1. For use in a region which contains at least first and second in-ground cables, each of which cables includes an electrically conductive component such that, when the first cable is driven at a locating signal frequency to emit a locating signal in an electromagnetic form, the locating signal can be coupled to the second cable in a way which causes the second cable to generate a false locating signal in electromagnetic form, a method comprising:
- receiving the locating signal and the false locating signal as well as receiving a reference signal which contains said locating signal frequency impressed thereon; and
distinguishing the locating signal from the false locating signal based on said locating signal frequency as contained by the reference signal.
1 Assignment
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Accused Products
Abstract
Discriminating between a cable locating signal and a false cable locating signal is described. A reference signal, which contains a locating signal frequency impressed on it, is transmitted in a way which provides for detection of a phase shift between the locating signal and the false locating signal. Based on the phase shift, a receiver is used to distinguish the locating signal from the false locating signal.
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Citations
13 Claims
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1. For use in a region which contains at least first and second in-ground cables, each of which cables includes an electrically conductive component such that, when the first cable is driven at a locating signal frequency to emit a locating signal in an electromagnetic form, the locating signal can be coupled to the second cable in a way which causes the second cable to generate a false locating signal in electromagnetic form, a method comprising:
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receiving the locating signal and the false locating signal as well as receiving a reference signal which contains said locating signal frequency impressed thereon; and distinguishing the locating signal from the false locating signal based on said locating signal frequency as contained by the reference signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification