Detection and estimation of a fault on coaxial cable via time-frequency domain reffectometry

Abstract

The time-frequency domain reflecfometfy (TFDR) is a newlyproposed method to detect and locafe a foulf in a e o a i d esble. Thepurpose of fhispnper is lo discuss fhe usefulness and effediwness of fhe T F D R for defedion andloculizafion of (I fault. The fraditional repccfometfy methods can be chofegorized in either fhe time domain or frequency domain only; however, the T F D R utilizes rime ond frequency information of (I tronsienf signal fo defect and locafe fhe faull. The T F D R opproaeh described in fhis paper is summarized by the design of a time-frequency reference signor end the post-processing of fhe reference and r@ecfred signols The design ondposfprocessing are eomplefely based on joinf fime-frequemy analysis & deal with time and frequency localized information. W f h the aid of signalgenerofion and ocq"risifion instruments, the T F D R algorithm hns been verijied for a red world coaxial cable (RC 142 fype) for differemf stales of fhe fault Also fhe T F D R algorithm is eompored with fhe fradifionol TDR. On fhe basis of the experintenfa1 resulfsprovidcd in fhbpoper, T F D R locales fhe faulf with smaller error than time domnin mflecfometfy,