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Application of time-frequency domain reflectometry for detection and localization of a fault on a coaxial cable

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7 Author(s)
Yong-June Shin ; Dept. of Electr. Eng., Univ. of South Carolina, Columbia, SC, USA ; Powers, E.J. ; Tok-Son Choe ; Chan-Young Hong
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In this paper, we introduce a new high-resolution reflectometry technique that operates simultaneously in both the time and frequency domains. The approach rests upon time-frequency signal analysis and utilizes a chirp signal multiplied by a Gaussian time envelope. The Gaussian envelope provides time localization, while the chirp allows one to excite the system under test with a swept sinewave covering a frequency band of interest. This latter capability is of particular interest when testing communication cables and systems. Sensitivity in detecting the reflected signal is provided by a time-frequency cross-correlation function. The approach is verified by experimentally locating various types of faults, located at various distances, in RG 142 and RG 400 coaxial cables.

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Instrumentation and Measurement, IEEE Transactions on  (Volume:54 ,  Issue: 6 )