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Low-Complexity DOA Estimation for Uniform Circular Arrays with Directional Sensors Using Reconfigurable Steering Vectors

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Abstract

In the direction-of-arrival (DOA) estimation methods for uniform circular arrays (UCAs) with directional sensors, the high computational complexity arises when achieving the estimation accuracy by leveraging all the sensors in the element space. We present a low-complexity sectorized DOA estimation scheme for directional UCAs. It models the radiation pattern within half-power bandwidth in a closed mathematical expression and thereby constructs reconfigurable sectorized steering vectors of an arbitrary angular sector by using the Hadamard cyclic vector with the Vandermonde structure. The DOA estimation over the azimuth plane throughout the element space is transformed to DOA estimates within multiple individual angular sectors. The new scheme comprises three stages, i.e., submatrix extraction, sectorized weighted beamforming and sector DOA estimation. The feasibility and effectiveness of the proposed scheme are validated by numerical simulations. The simulation results demonstrate that, compared to the previous sector-free DOA estimation methods based on the entire azimuth plane, our scheme has a low hardware and computational complexity under an acceptable estimation error.

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The data supporting the results of this study can be obtained from the corresponding author upon reasonable request.

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Authors and Affiliations

  1. School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing, 100876, China

    Di Zhao & Zhongliang Deng

  2. The 54th Research Institute of CETC, Shijiazhuang, 050080, Hebei, China

    Di Zhao

  3. State Key Laboratory of Public Big Data College of Computer Science and Technology, Guizhou University, Guiyang, 550025, Guizhou, China

    Weijie Tan

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  1. Di Zhao
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Correspondence to Di Zhao.

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Zhongliang Deng and Weijie Tan have contributed equally to this work.

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Zhao, D., Deng, Z. & Tan, W. Low-Complexity DOA Estimation for Uniform Circular Arrays with Directional Sensors Using Reconfigurable Steering Vectors. Circuits Syst Signal Process 42, 1685–1706 (2023). https://doi.org/10.1007/s00034-022-02188-z

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