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Spectral Analysis of Atmospheric Radar Echoes Using a Non-Stationary Approach

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Abstract

Generally, radar echo is analysed in the assumptions that echo comes from stationary processes. Signal processing algorithms of atmospheric radar echoes are based on stationarity assumptions. In this paper, we propose a technique for processing the radar echoes by still preserving their non-stationary nature. The proposed algorithm is based on the complex empirical mode decomposition (CEMD) of non-stationary complex atmospheric radar signals. The well-established technique Hilbert Huang transform has been applied for the practical radar echoes collected from the Mesosphere-Stratosphere-Troposphere radar located at Gadanki Andhra Pradesh. The data is subjected to proposed CEMD algorithm and results are obtained and Stationarity is tested using the wavelet transform. The inference from the obtained results is of two-fold: Hilbert spectrum is very well localized and can be used for stationarity test like Wavelet spectrum, the frequency components in Hilbert spectrum lies in the signal region of Fourier spectrum thereby resembling it. For better interpretation, the algorithm is also applied for simulated signals under both stationary and non-stationary environments. The results motivate us for better exploitation of HHT for the spectral analysis of atmospheric radar echoes.

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  • 11 July 2021

    The original version of this article has been revised: The copyright holder name has been corrected

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Acknowledgement

Authors gratefully thank the National Atmospheric Research Laboratory (NARL, Gadanki) technical staff for their support in carrying out the observations reported here.

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The investigations presented in the manuscript are not funded by any external agencies.

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Authors and Affiliations

  1. Department of ECE, Faculty of Engineering and Technology, College of Engineering and Technology, SRM Institute of Science and Technology, SRM Nagar, Kancheepuram, Chengapattu, Tamilnadu, 603203, India

    Jaba Deva Krupa Abel, Samiappan Dhanalakshmi & R Kumar

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  1. Jaba Deva Krupa Abel
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  2. Samiappan Dhanalakshmi
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  3. R Kumar
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Correspondence to Samiappan Dhanalakshmi.

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Abel, J.D.K., Dhanalakshmi, S. & Kumar, R. Spectral Analysis of Atmospheric Radar Echoes Using a Non-Stationary Approach. Wireless Pers Commun 121, 1011–1023 (2021). https://doi.org/10.1007/s11277-021-08669-9

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