VLF Atmospheric Noise Suppression Using Median Filter and Wavelet Threshold Denoising

Author

Fu, Tianhui ; Zhou, Suihua

Author_Institution

Dept. of Weaponry Eng., Naval Univ. of Eng., Wuhan, China

fYear

2009

fDate

17-19 Oct. 2009

Firstpage

1

Lastpage

4

Abstract

Very low-frequency (VLF) atmospheric noise is nonGaussian, consisting of the sum of a Gaussian background and narrow pulses caused by lighting strokes, and conventional denoising method fails on it. In this paper, a new strategy to suppress the VLF atmospheric noise is proposed. First, the corrupt signal is passed through a median filter and the impulses in the atmospheric noise are suppressed. Then the disposed signal is shrunk with wavelet threshold to suppress the residual Gaussian noise. Finally, ultimate reconstructed signal is attained. The results are compared to the conventional method in the VLF communication system.

Keywords

Gaussian noise; atmospheric techniques; atmospherics; geophysical signal processing; impulse noise; median filters; signal denoising; wavelet transforms; VLF atmospheric noise suppression; corrupt signal; lighting strokes; median filter; residual Gaussian noise; very low-frequency atmospheric noise; wavelet threshold denoising; Atmospheric modeling; Atmospheric waves; Background noise; Filters; Gaussian noise; Lightning; Low-frequency noise; Noise level; Noise reduction; Probability distribution;

fLanguage

English

Publisher

ieee

Conference_Titel

Image and Signal Processing, 2009. CISP '09. 2nd International Congress on

Conference_Location

Tianjin

Print_ISBN

978-1-4244-4129-7

Electronic_ISBN

978-1-4244-4131-0

Type

conf

DOI

10.1109/CISP.2009.5301875

Filename

5301875