POWER SPECTRUM ESTIMATION FOR MAGNETOTELLURIC SIGNAL BASED ON CONTINUOUS WAVELET TRANSFORM
Yixian Xu · Chinese Journal of Geophysics · 2000
This research aims to improve the accuracy of power spectrum estimation of magnetotelluric signal by using continuous wavelet transform. Three statistic method, global average, wavelet coefficients shrinkaging and significance test, are used to estimate the power spectrum. Empirical formulas are given for the transformation between wavelet scale and Fourier frequency. The algorithm is also described in detail. The numerical tests show that the estimation is robust to stronger white noise and local correlated noise, and significantly decreases the requirement for the recoding length. [