Low-Complexity Estimation of the Nominal Azimuth and Elevation for Incoherently Distributed Sources

  • Authors:

  • Jie Zhou;Zhi Zheng;Guangjun Li

  • Affiliations:

  • School of Communication and Information Engineering, University of Electronic Science and Technology of China, Chengdu, China 610054;School of Communication and Information Engineering, University of Electronic Science and Technology of China, Chengdu, China 610054;School of Communication and Information Engineering, University of Electronic Science and Technology of China, Chengdu, China 610054

  • Venue:
  • Wireless Personal Communications: An International Journal
  • Year:
  • 2013

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Abstract

This paper develops a new technique for estimating the two-dimensional direction-of-arrivals (DOAs) of incoherently distributed (ID) sources, which can estimate effectively the nominal azimuth and nominal elevation of multiple ID sources at the cost of less computational complexity. Using a pair of parallel uniform linear arrays (ULAs), a new approach for 2D DOA estimation of multiple ID sources is proposed. The proposed method firstly estimates the nominal elevation by the modified TLS-ESPRIT method, which is based on the approximate rotational invariance property with respect to the nominal elevation between two closely parallel ULAs. And then with the help of the nominal elevation estimates, the nominal azimuth is estimated by one-dimensional searching. Without multi-dimensional searching, the proposed method has significantly reduced the computational cost compared with the existing methods. Simulation results indicate that the proposed method can exhibit a good performance and be applied to the multisource scenario where different sources may have different angular distribution shapes.