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Parameter Estimation for Two-Dimensional Incoherently Distributed Source with Double Cross Arrays.

Tao Wu1, Yiwen Li2,3, Zhenghong Deng4

  • 1Equipment Management and UAV College, Air Force Engineering University, Xi'an 710051, China.

Sensors (Basel, Switzerland)
|August 23, 2020
PubMed
Summary
This summary is machine-generated.

This study introduces a novel direction of arrival (DOA) estimation method for two-dimensional (2D) incoherently distributed (ID) sources using double cross arrays. The proposed algorithm enhances accuracy and computational efficiency without requiring spectral search or prior angular power density information.

Keywords:
angular spreadsdirection of arrivaldouble cross arraysgeneralized manifold matrixincoherently distributed sources

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Area of Science:

  • Signal Processing
  • Array Signal Processing
  • Electromagnetics

Background:

  • Estimating the direction of arrival (DOA) for two-dimensional (2D) incoherently distributed (ID) sources presents challenges in achieving both spatial resolution and aperture equalization.
  • Existing methods often require spectral searches or prior knowledge of source characteristics, limiting their practical application.

Purpose of the Study:

  • To develop a novel DOA estimation method for 2D ID sources using a proposed double cross array configuration.
  • To achieve aperture equalization in both elevation and azimuth dimensions while maintaining a small interval between parallel linear arrays.
  • To eliminate the need for spectral search and prior knowledge of angular power density functions.

Main Methods:

  • Utilizing a first-order Taylor expansion for array manifold vectors to reconstruct the received signal.
  • Deriving rotating invariant relations for nominal elevation and azimuth.
  • Obtaining rotating operators from the covariance matrix subspace.
  • Employing the Capon principle for angle matching and exploring angular spreads.

Main Results:

  • The proposed method accurately estimates the DOA of 2D ID sources without spectral search or prior angular power density information.
  • Demonstrated significant advantages in computational cost compared to existing methods.
  • Numerical simulations validated the method's effectiveness, showing improved estimation accuracy and robustness against model mismatch under similar experimental conditions.

Conclusions:

  • The developed DOA estimation algorithm offers superior accuracy and computational efficiency for 2D ID sources.
  • The double cross array configuration effectively addresses aperture equalization and parallel array interval requirements.
  • The method's robustness and lack of reliance on prior information make it a valuable advancement in array signal processing.