基于特定频带的Prony暂态振荡检测方法

小波分析和Prony算法都是分析暂态信号的有效方法,但小波分析不能得到信号频点信息,Prony算法的实现需要事先判断信号发生时刻.该文通过比较二者的优缺点,结合小波分析时频局部化和Prony算法可以准确获取振荡模式特征的优点,提出基于特定频带的Prony暂态振荡检测方法,克服了基于特定频带的STFT检测方法由于振荡信号...

The Prony Detection Method of Transient Oscillation Based on the Specific Frequency Band

Wavelet and Prony algorithm are both the effective methods for the analysis of transient signals.However,wavelet analysis can notgetthe signal frequency information,and Prony algorithmalso need to determine the signal oc-curred moment in advance.In this paper,by comparing the advantages and disadvantages of both,and combining thewavelet analysis with time-frequency localization and the Prony algorithmwith high accuracy to get the transient oscil-lation mode characteristics,a newProny detection method based on the specific frequency band is proposed.It over-comes problem of lowaccuracy of the STFTdetection method based on specific frequency band,when the oscillationsignal decays too fast to reserve energy.First,it utilizes the Mallat algorithm for the transient oscillation signal’s de-composition and reconstruction;and then,selects the appropriate frequency band,including specific details of thetransient signal meeting the energy requirements.Based on the extraction of the specific frequency band,Prony algo-rithm are used to detectthe signal.Simulation is done to compare with the STFTand Prony detection methods based onthe specific frequency band about accuracy of the signal characteristic parameters,and verified the validity and accura-cy of the Prony detection method based on the specific frequency band.