Underground object locating system without direction ambiguity
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United States of America Patent
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Feb 22, 2005
Grant Date -
Aug 21, 2003
app pub date -
Feb 15, 2002
filing date -
Feb 15, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In an underground object locating system in which a modulated RF signal is applied to the underground object and an emitted signal is detected by a receiver, ambiguity in the direction of current flow in the underground object is resolved by modulating the RF signal with a modulation signal such that the modulated signal, f(t) has an average value of zero and is not equal to -f(t+K) where K is any practical value. In specific embodiments, the modulation can be amplitude modulation where the modulating signal is lower in frequency than the RF signal and is related thereto by a rational number, such as one-half (1/2).
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