摘要
针对常用的波形评价参数(normalized correlation coeffiient,NCC)和变化趋势参数来描述振荡波形畸变情况的不足,利用数字化测量中不同离散波形对应时刻的微分的比值越趋于1波形越相似的原理,提出并定义一种能微观描述波形畸变程度的变化细节参数,阐述了该参数的数学意义,并用信号的功率谱验证了其正确性。理论仿真研究表明:它能有效评价振荡波形衰减尾部的细节畸变情况,与NCC配合使用,并结合信噪比能更好地对局部放电信号去噪的效果进行综合评价。
The alternating detail parameter (ADP) is a new parameter to represent waveform micro-distortion. It is proposed to overcome the shortcomings of the traditional evaluation parameters, the normalized correlation coefficient (NCC) and the variation trend parameter. This proposal is based on the principle that two discrete waveforms are more similar if the ratio of their corresponding differentials is close to one. ADP is shown to be correct by power spectrum analysis. Simulation research demonstrated that ADP is valid for evaluating the effect on the de-noised partial discharge signal by associating NCC with signal noise ratio.
出处
《重庆大学学报(自然科学版)》
EI
CAS
CSCD
北大核心
2009年第3期252-256,共5页
Journal of Chongqing University
基金
国家自然科学基金资助项目(507770701)
973计划资助项目(2009CB724506)
关键词
信号去噪
波形畸变
变化细节参数
综合评价
signal de-noising
waveform distortion alternating detail parameter
synthetic evaluation