Empirical mode decomposition of Atmospheric radar signals

0*, S. Varadarajan**, G. Madhavi Latha***
* Associate Professor of ECE, C.R Engg College, Tirupati.
** Professor of ECE, S.V.U college of Engg, Tirupati.
*** Assistant Professor, Sri Vidyanekhethan Engg College, Tirupati.
Periodicity:June - August'2011
DOI : https://doi.org/10.26634/jele.1.4.1508

Abstract

In this paper, comparison study of wavelet transforms and Empirical mode decomposition (EMD) was performed for two sets of atmospheric radar data. Wavelets and EMD has been applied to the time series data obtained from the mesosphere-stratosphere-troposphere (MST) region near Gadanki, Tirupati.  Wavelet analysis is one of the most important methods for removing noise and extracting signal from any data. The de-noising application of the wavelets has been used in spectrum cleaning of the atmospheric signals. EMD is a numerical sifting process to decompose a signal into its fundamental intrinsic oscillatory modes, namely intrinsic mode functions (IMFs).  A series of IMFs can be obtained after the application of EMD. The Algorithm is developed and tested using Matlab. Analysis has brought out some of the characteristic features such as Doppler width, SNR of the atmospheric signals. The results showed that the proposed algorithm is efficient for dealing non-linear and non- stationary signals contaminated with noise.  SNR using wavelets and EMD has been compared and plotted for validation of the proposed algorithm. EMD is found to be effective in removing the noise embedded in radar echoes.

Keywords

Empirical Mode Decomposition (EMD), Intrinsic mode Functions (IMF), Wavelets, SNR, Radar Signals.

How to Cite this Article?

N. Padmaja, S. Varadarajan and G. Madhavi Latha (2011). Empirical Mode Decomposition Of Atmospheric Radar Signals. i-manager’s Journal on Electronics Engineering, 1(4), 29-37. https://doi.org/10.26634/jele.1.4.1508

References

[1]. Norden E. Huang, Z. Shen, & S. R. Long, M.L.Wu, E. H. Shih, Q. Zheng, C. C. Tung, & H. H. Liu, (1998). “The Empirical Mode Decomposition and the Hilbert Spectrum for Nonlinear and Nonstationary Time Series Analysis,” Proceedings of the Royal Society of London A, Vol. 454, pp 903-995.
[2]. Z. Wu & N. E. Huang, (2004). “A study of the characteristics of white noise using the empirical mode decomposition method”. Proc. Roy. Soc London A, Vol. 460, pp. 1597-1611.
[3]. Z.K. Peng, Peter W. Tseb, & F.L. Chu. (2005). An improved Hilbert–Huang transform and its application in Vibration signal analysis. Journal of Sound and Vibration, 286 187–205
[4]. Dejie Yu, Junsheng Cheng, Yu Yang. (2010). Application IEEE transactions on signal processing, Vol. 58, No. 3, March.
[5]. Empirical Mode Decomposition for Trivariate Signals Naveed ur Rehman, Student Member, IEEE, and Danilo P. Mandic, Senior Member, IEEE.
[6] Flandrin P, Rilling G, Goncalves P., “Empirical mode decomposition as a filter bank”. IEEE Signal Processing Letters, Feb. 2004, Vol. 11, Issue 2, Part 1, pp: 112–114.
[7]. N.E Huang, S.R.Long, & Z Shen, (1999). “A new view of nonlinear water waves: The Hilbert spectrum”, Annu. Rev. Fluid Mech, .Vol.31, pp. 417-457.
[8]. Wang Chun, & Peng Dong-ling, (2004). “The Hilbert- Huang Transform and Its Application on Signal Denoising”, China Journal of Scientific Instrument, Vol.25,no.4, pp. 42-45.
[9]. R. Gabriel & F. Patrick. (2008). “The Empirical Mode Decomposition Answers”. IEEE Transactions on Signal Processing, Vol. 56, No. 1.
[10]. Z. K. Penga, Peter W. Tse, & F. L. Chu, (2005). “A comparison study of improved Hilbert–Huang transform and wavelet transform: Application to fault diagnosis for rolling bearing,” Mechanical Systems and Signal Processing, pp. 974–988.
[11]. Yuan Li. (2001). ”Wavelet Analysis for Change Points and Nonlinear Wavelet Estimates in Time Series.” Beijing: China Statistics Press.
[12]. Angkoon Phinyomark, Chusak Limsakul, & Pornchai Phukpattaranont (2010). “Optimal Wavelet Functions in Wavelet Denoising for Multifunction Myoelectric Control” “IEEE Transactions on Signal Processing.
[13]. H. G. R. Tan, A. C. Tan, P. Y. Khong, & V. H. Mok, (2007). “Best wavelet function identification system for ecg signal denoise applications,” in International Conference on Intelligent and Advanced Systems, pp. 631–634.
[14]. M. Kania, M. Fereniec, & R. Maniewski, (2007). “Wavelet denoising for multi-lead high resolution ecg signals,” Measurement Science Review, Vol. 7, No. 4, pp. 30–33,
[15]. S. Neville & N. Dimopoulos, (2006). “Wavelet denoising of coarsely quantized signals,” IEEE Transactions on Instrumentation and Measurement, Vol. 55, No. 3, pp. 892–901.
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