Underground object locating system without direction ambiguity

Details Underground object locating system without direction ambiguity Underground object locating system without direction ambiguity

2005-02-22

2005-02-22

Gregory, Bernarr E. (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Transmission through media other than air or free space

C342S027000, C342S082000, C342S089000, C342S175000, C375S130000

Reexamination Certificate

active

06859162

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 (½).

REFERENCES:
patent: 3967282 (1976-06-01), Young et al.
patent: 4062010 (1977-12-01), Young et al.
patent: 5592170 (1997-01-01), Price et al.
patent: 6037784 (2000-03-01), Smith
patent: 6211807 (2001-04-01), Wilkison

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