Time-delay estimation of corona discharge radiation signal based on generalized cross correlation

The orientation of corona discharge radiant point was mostly realized by time difference orientation method based on the time-delay estimation. On the testing locales, the precision of the time-delay estimation was influenced by various background noise and interferential signals. The time-delay estimation method of generalized cross correlation was researched in this paper based on analyzing the domestic and international research dynamic state, which aimed at the localization of the basic cross correlation time-delay estimation, such as the low resolution definition and the weak robustness, etc. The time-delay estimation method which was suitable for the corona discharge radiation signal was searched by simulation comparing and experiment validating based on adopting different weight function. The research indicated that the time-delay estimation method of generalized cross correlation based on weighted Hassab-Boucher (HB) had the best restraining effect and highest precision for the periodicity interferential signals in the reality testing environment, and the error of the time-delay estimation was 4.5%. It was feasible to carry out the time-delay estimation and far distance orientation of the corona signals in the actual engineering application. (authors)