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The continuous wavelet transform (CWT) based on complex Morlet wavelets is used to identify magnetic sources. After summarizing the theory of CWT, we discussed the relationship between scale and frequency. In real cases, the magnetic anomalies of adjacent sources always superimpose on each other in space and frequency, making the identification of magnetic sources problematic. Therefore, we devise...
We applied a third-order correlation technique for identification of wavelet coefficients uncorrupted by noise by considering triple correlation coefficients of wavelet-signal correlations for thresholding. Various important theoretical results are stated and discussed for the wavelet modulus maxima method, VisuShrink method and HOS-based thresholding method. Then key properties of each method are...
The paper described a structure of three modules diagnosis system for detecting and identifying faults that occur in the sensor and actuator of control systems with input and output signals related to the component itself. The diagnosis algorithm consists of three steps; firstly, generalized morphological filter with multi-structure elements is designed to filter the random noise and impulse noise...
On the assumption that the reflection coefficient series is a non-Gaussian, stationary and statically independent random process, ARMA model was introduced to solve the mixed phase seismic wavelet estimation. In this paper, a cumulant-based SVD-TLS (singular value decomposition and total least squares) algorithm with less computational price was employed. Numerical simulations demonstrate that the...
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