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kangfulike

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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 timefrequency
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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