DOA Estimation for Underwater Wideband Weak Targets Based on Coherent Signal Subspace and Compressed Sensing

Direction of arrival (DOA) estimation is the basis for underwater target localization and tracking using towed line array sonar devices. A method of DOA estimation for underwater wideband weak targets based on coherent signal subspace (CSS) processing and compressed sensing (CS) theory is proposed....

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2018-03, Vol.18 (3), p.902
Main Authors: Li, Jun, Lin, Qiu-Hua, Kang, Chun-Yu, Wang, Kai, Yang, Xiu-Ting
Format: Article
Language:English
Subjects:
Acoustics
Algorithms
Beamforming
Broadband
compressed sensing
Computer engineering
Computer simulation
Data models
Direction of arrival
direction of arrival estimation
Methods
Noise
reconstruction algorithm
Sensors
Signal processing
Simulation
Sparsity
underwater acoustics
wideband
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Summary:Direction of arrival (DOA) estimation is the basis for underwater target localization and tracking using towed line array sonar devices. A method of DOA estimation for underwater wideband weak targets based on coherent signal subspace (CSS) processing and compressed sensing (CS) theory is proposed. Under the CSS processing framework, wideband frequency focusing is accompanied by a two-sided correlation transformation, allowing the DOA of underwater wideband targets to be estimated based on the spatial sparsity of the targets and the compressed sensing reconstruction algorithm. Through analysis and processing of simulation data and marine trial data, it is shown that this method can accomplish the DOA estimation of underwater wideband weak targets. Results also show that this method can considerably improve the spatial spectrum of weak target signals, enhancing the ability to detect them. It can solve the problems of low directional resolution and unreliable weak-target detection in traditional beamforming technology. Compared with the conventional minimum variance distortionless response beamformers (MVDR), this method has many advantages, such as higher directional resolution, wider detection range, fewer required snapshots and more accurate detection for weak targets.
ISSN:1424-8220
1424-8220
DOI:10.3390/s18030902