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Direction-of-arrival estimation of quasi-stationary signals using two-level Khatri-Rao subspace and four-level nested array

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Abstract

The Khatri-Rao (KR) subspace method is a high resolution method for direction-of-arrival (DOA) estimation. Combined with 2q level nested array, the KR subspace method can detect O(N 2q) sources with N sensors. However, the method cannot be applicable to Gaussian sources when q is equal to or greater than 2 since it needs to use 2q-th order cumulants. In this work, a novel approach is presented to conduct DOA estimation by constructing a fourth order difference co-array. Unlike the existing DOA estimation method based on the KR product and 2q level nested array, the proposed method only uses second order statistics, so it can be employed to Gaussian sources as well as non-Gaussian sources. By exploiting a four-level nested array with N elements, our method can also identify O(N 4) sources. In order to estimate the wideband signals, the proposed method is extended to the wideband scenarios. Simulation results demonstrate that, compared to the state of the art KR subspace based methods, the new method achieves higher resolution.

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Authors and Affiliations

  1. Key Laboratory of Wireless Sensor Networks and Communication, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, 200180, China

    Shuang Li  (李双), Wei He  (何为), Xu-guang Yang  (杨旭光) & Ying-guan Wang  (王营冠)

  2. Communication Acoustics Laboratory, Institute of Acoustics, Chinese Academy of Sciences, Beijing, 100190, China

    Shuang Li  (李双) & Ming Bao  (鲍明)

Authors
  1. Shuang Li  (李双)
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  2. Wei He  (何为)
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  3. Xu-guang Yang  (杨旭光)
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  4. Ming Bao  (鲍明)
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  5. Ying-guan Wang  (王营冠)
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Corresponding author

Correspondence to Wei He  (何为).

Additional information

Foundation item: Project(2010ZX03006-004) supported by the National Science and Technology Major Program of China; Project(YYYJ-1113) supported by the Knowledge Innovation Program of the Chinese Academy of Sciences; Project(2011CB302901) supported by the National Basic Research Program of China

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Li, S., He, W., Yang, Xg. et al. Direction-of-arrival estimation of quasi-stationary signals using two-level Khatri-Rao subspace and four-level nested array. J. Cent. South Univ. 21, 2743–2750 (2014). https://doi.org/10.1007/s11771-014-2236-5

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  • DOI: https://doi.org/10.1007/s11771-014-2236-5

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