High resolution LFMCW radar system using model-based beat frequency estimation in cable fault localization

IEICE Electronics Express

Chun Ku Lee¹  Yong-June Shin¹  Jin Bae Park¹  Tae Sung Yoon² 

[1] Department of Electrical and Electronic Engineering, Yonsei University;Department of Electrical Engineering, Changwon National University

关键词: LFMCW radar;    reflectometry;    chirp signal;    auto-regressive model;    fault locating;    instantaneous frequency estimation;   

DOI  :  10.1587/elex.10.20130768

学科分类：电子、光学、磁材料

来源: Denshi Jouhou Tsuushin Gakkai

【 摘 要 】

References(7)Cited-By(1)A linear frequency modulated continuous wave (LFMCW) radar is introduced to localize the impedance discontinuities on the instrument cable used in nuclear plants. The LFMCW reflectometry uses a phenomenon that electromagnetic pulses are reflected at the impedance discontinuities to localize impedance discontinuity points on the cable. For localizing impedance discontinuities, time delays between the incident signal and the reflected signals from the impedance discontinuities have to be measured. The LFMCW is modeled by time-varying auto-regressive (AR) model. From the coefficients of the AR model, instantaneous frequency is estimated by the Kalman filtering to calculate the time delays. The performance of the proposed method is verified by experiments.

【 授权许可】

Unknown