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Underdetermined DOA Estimation for Wideband Signals via Focused Atomic Norm Minimization
Juan Shi1, Qunfei Zhang1, Weijie Tan2
1School of Marine Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China.
Entropy (Basel, Switzerland)
|December 8, 2020
Summary
This study introduces a new method for direction of arrival (DOA) estimation in underwater passive detection systems. The novel approach enhances accuracy for underdetermined wideband signals using a nested array and focused atomic norm minimization.
Area of Science:
- Underwater Acoustic Signal Processing
- Array Signal Processing
- Passive Detection Systems
Background:
- Direction of Arrival (DOA) estimation is crucial for underwater target tracking and localization.
- Underdetermined wideband signal processing in passive detection presents significant challenges.
- Existing methods struggle with accuracy in complex underwater acoustic environments.
Purpose of the Study:
- To propose a novel underdetermined wideband DOA estimation method for underwater passive detection.
- To enhance DOA estimation accuracy using a nested array (NA) and focused atomic norm minimization (ANM).
- To effectively detect the number of signal sources using information theory criteria.
Main Methods:
- Utilizing a nested array (NA) configuration for enhanced spatial sampling.
- Applying focused atomic norm minimization (ANM) with semi-definite programming (SDP) for covariance matrix recovery.
- Employing information theory criteria for accurate signal source number detection.
- Leveraging the Vandermonde structure of the virtual array model for DOA estimation.
- Implementing the Root-MUSIC algorithm for final DOA estimation.
Main Results:
- The proposed method demonstrates superior performance compared to existing underdetermined DOA estimation techniques.
- Achieved higher estimation accuracy in simulations for wideband signals.
- Successfully addressed challenges in underdetermined passive sonar scenarios.
- Validated the effectiveness of focused ANM and nested arrays in improving DOA accuracy.
Conclusions:
- The novel underdetermined wideband DOA estimation method offers significant improvements in accuracy for underwater passive detection.
- The combination of nested arrays and focused ANM provides a robust solution for complex acoustic environments.
- This method represents a valuable advancement in underwater acoustic signal processing and target localization.
Keywords:
atomic norm minimization (ANM)direction of arrival (DOA) estimationinformation theory criterianested array (NA)underwater acoustic signal processingwideband signalsMore Related Videos
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