Data processing: measuring – calibrating – or testing – Measurement system – Measured signal processing
Reexamination Certificate
2006-06-13
2006-06-13
Tsai, Carol S. W. (Department: 2857)
Data processing: measuring, calibrating, or testing
Measurement system
Measured signal processing
C324S326000, C324S327000, C324S328000, C324S329000
Reexamination Certificate
active
07062414
ABSTRACT:
A new digital architecture for metallic pipe and cable locators, providing accurate estimation of the fundamental locate parameters, electromagnetic signal strength and signal direction, and utilizing a nested Digital Phase-Locked Loop (DPLL) structure is disclosed. The obstacles to signal direction measurement in low SINR environments using the signal select method are overcome and a more precise phase comparison between the carrier and the FM modulation signals is obtained. The architecture further significantly reduces analog front-end hardware requirements, offers wider resistance to component tolerances, lower calibration and test time, and provides flexible frequency selectivity. Locators according to the present invention provide accurate estimation of the fundamental physical parameters of line location (electromagnetic signal strength and signal direction) in extremely noisy environments, using Digital Signal Processing (DSP) methods.
REFERENCES:
patent: 4723216 (1988-02-01), Premerlani
patent: 4802009 (1989-01-01), Hartmeier
patent: 4942360 (1990-07-01), Candy
patent: 5025227 (1991-06-01), Walton
patent: 5231355 (1993-07-01), Rider et al.
patent: 5260659 (1993-11-01), Flowerdew et al.
patent: 5541516 (1996-07-01), Rider et al.
patent: 6140819 (2000-10-01), Peterman et al.
patent: 6310579 (2001-10-01), Meredith
patent: 6396433 (2002-05-01), Clodfelter
patent: 6424820 (2002-07-01), Burdick et al.
patent: 6529006 (2003-03-01), Hayes
patent: 6735263 (2004-05-01), Moriya et al.
patent: 6751553 (2004-06-01), Young et al.
patent: 2002/0196177 (2002-12-01), Johansson et al.
patent: 2004/0070399 (2004-04-01), Olsson et al.
patent: 2005/0088301 (2005-04-01), Abbruscato
patent: 2005/0156776 (2005-07-01), Waite
patent: 299724 (1989-01-01), None
patent: 0 780 704 (2001-06-01), None
Doolittle, James A. et al., “A comparison of EM induction and GPR methods in areas of karst,” Elsevier B.V. (1998), 85:83-102.
Office Action dated Oct. 27, 2005, received in U.S. Appl. No. 10/997,729.
As-filed U.S. Appl. No. 11/193,1000, filed Jul. 29, 2005.
Overby Johan D.
Waite James W.
Metrotech Corporation
Tsai Carol S. W.
LandOfFree
Method and apparatus for digital detection of... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for digital detection of..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for digital detection of... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3664693