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An Improved Toeplitz Approximation Method for Coherent DOA Estimation in Impulsive Noise Environments.

Jiang'an Dai1, Tianshuang Qiu1, Shengyang Luan2

  • 1Faculty of Electronic Information and Electrical Engineering, Dalian University of Technology, Dalian 116024, China.

Entropy (Basel, Switzerland)
|June 28, 2023
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Summary
This summary is machine-generated.

This study introduces a new method for direction of arrival (DOA) estimation of coherent signals in impulsive noise. The novel approach enhances accuracy and avoids array aperture loss, outperforming existing algorithms in challenging noise conditions.

Keywords:
Toeplitz approximationcoherent signalscorrentropydirection of arrival estimationgeneralized covarianceimpulsive noise

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Area of Science:

  • Array signal processing
  • Statistical signal processing

Background:

  • Direction of Arrival (DOA) estimation is crucial in array signal processing but faces challenges with coherent signals and impulsive noise.
  • Conventional subspace methods degrade with rank deficiency and non-Gaussian noise, limiting their practical application.

Purpose of the Study:

  • To develop a robust DOA estimation method for coherent signals in impulsive noise environments.
  • To address the limitations of conventional algorithms in handling correlated sources and non-ideal noise conditions.

Main Methods:

  • A novel correntropy-based generalized covariance (CEGC) operator was defined and its boundedness proven for impulsive noise resilience.
  • An improved Toeplitz approximation method was combined with the CEGC operator for estimating the DOA of coherent sources.
  • The method was designed to avoid array aperture loss, a common issue in traditional techniques.

Main Results:

  • The proposed CEGC operator ensures effectiveness in impulsive noise environments.
  • The combined method demonstrates superior performance compared to existing algorithms, especially under intense impulsive noise.
  • The algorithm maintains effectiveness even with low snapshot numbers.

Conclusions:

  • The novel CEGC-based method offers a robust solution for DOA estimation of coherent signals in impulsive noise.
  • The technique provides enhanced accuracy and avoids array aperture loss, outperforming conventional methods.
  • This advancement is significant for practical engineering applications facing complex signal and noise conditions.