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A Computationally Efficient and Virtualization-Free Two-Dimensional DOA Estimation Method for Nested Planar Array:

Shengxinlai Han1, Xin Lai1, Yu Zhang1

  • 1College of Electronic Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China.

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Summary

This study introduces a novel 2D direction of arrival (DOA) estimation method using nested planar arrays (NPAs). The technique reduces computational cost and improves accuracy by transforming the problem into polynomial root-finding, enhancing signal processing efficiency.

Keywords:
degree of freedomdirection of arrival estimationnested planar arraypolynomial root findingreduced-dimensional

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Area of Science:

  • Signal Processing
  • Array Signal Processing
  • Electromagnetics

Background:

  • Traditional 2D Direction of Arrival (DOA) estimation methods face challenges with high computational complexity.
  • Nested Planar Arrays (NPAs) offer advantages in aperture utilization but require efficient processing algorithms.

Purpose of the Study:

  • To develop a computationally efficient and accurate 2D DOA estimation algorithm for NPAs.
  • To overcome the limitations of traditional spectral peak search methods.

Main Methods:

  • A reduced-dimension approach is employed, transforming the 2D DOA problem into two 1D estimation problems.
  • The 1D estimation problem is further converted into a polynomial root-finding problem.
  • Parameter pairing is utilized to achieve the final 2D DOA estimation.

Main Results:

  • The proposed method avoids performance degradation from intermediate operations by directly performing root finding.
  • It effectively utilizes the enlarged array aperture of NPAs.
  • Reduced computational complexity and no need for virtualization are achieved.

Conclusions:

  • The new algorithm offers a significant improvement in estimation accuracy and computational efficiency for 2D DOA estimation using NPAs.
  • Simulations validate the superior performance of the proposed method compared to existing techniques.