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Related Experiment Video

Updated: Aug 15, 2025

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Unambiguous broadband direction of arrival estimation based on improved extended frequency-difference method.

Xin Wang1, Hui Sun1, Liang Zhang1

  • 1Acoustic Science and Technology Laboratory, Harbin Engineering University, Harbin, 150001, China.

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Summary

This study introduces a new method to resolve bearing ambiguity in direction of arrival (DOA) estimation, effectively suppressing spatial aliasing for clearer signal analysis.

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Area of Science:

  • Signal Processing
  • Array Signal Processing
  • Underwater Acoustics

Background:

  • Direction of Arrival (DOA) estimation faces challenges with bearing ambiguity caused by spatial aliasing in broadband signals.
  • Spatial aliasing occurs when the signal's minimum wavelength is smaller than the sensor spacing in a uniform linear array (ULA).

Purpose of the Study:

  • To develop an unambiguous broadband DOA estimation method.
  • To address the limitations of existing frequency-difference (FD) methods in handling spatial aliasing.

Main Methods:

  • An extended frequency-difference (FD) signal is constructed using conjugate multiplication of steering vectors and array sampled signals.
  • A decision criterion is established to differentiate frequency-varying aliasing components within the extended FD space.
  • Spatial aliasing is suppressed in the extended FD space to achieve unambiguous DOA estimation.

Main Results:

  • The proposed method effectively resolves bearing ambiguity caused by spatial aliasing.
  • Simulations demonstrate the method's robustness in low signal-to-noise ratio (SNR), low signal-to-interference ratio (SIR), and multi-interference scenarios.
  • Real-world application using ship signals in the South China Sea validates the unambiguous processing capability.

Conclusions:

  • The extended FD method provides an effective solution for unambiguous broadband DOA estimation.
  • The technique is particularly valuable for applications with ULA and broadband signals where spatial aliasing is a concern.
  • Field tests confirm the practical utility and performance of the proposed method in complex underwater environments.