Extraction of MHD Signal Based on Wavelet Transform
Zhao Qing-chu, Tong Zhao, Li Ming, Huang Sheng-hua, XU Pei-xia · Plasma Science and Technology · 2002
Mirnov signals mixed with interferences are a kind of non-stationary signal. It cannot obtain satisfactory effects to extract MHD signals from mirnov signals by Fourier Transform. This paper suggests that the wavelet transform can be used to treat mirnov signals. Theoretical analysis and experimental result have indicated that using the time-frequency analysis characteristics of the wavelet transform to filter mirnov signals can remove effectively interferences and extract useful MHD signals.