期刊
IEEE ACCESS
卷 9, 期 -, 页码 104142-104153出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2021.3099595
关键词
Sonar equipment; Quaternions; Direction-of-arrival estimation; Signal to noise ratio; Estimation; Sensors; Algebra; Quaternion; direction-of-arrival estimation; vector hydrophone; coherent signals; propagator method
资金
- Science and Technology on Underwater Information and Control Laboratory [6142218200410]
- National Natural Science Foundation of China [U1806201]
- China Shipbuilding Industry Corporation [715, 6142109180305]
- State Administration of Science, Technology and Industry for National Defense [JCKYS2019604SSJS006]
The study presents a novel quaternion-based DOA algorithm for coherent underwater sources at low SNR, which efficiently estimates the direction of arrival by utilizing statistical information and the propagator method. The method demonstrates robust performance and high resolution without requiring pair matching between estimated azimuth and elevation angles.
For scenarios of coherent underwater sources at low signal-to-noise ratio (SNR), a novel quaternion-based DOA algorithm without eigendecomposition is proposed using a linear vector-hydrophone array. We construct four quaternion models by judiciously arranging the received data to fully utilize the statistical information of the incident signals. To avoid the high computational complexity caused by the eigenvalue decomposition (EVD), we introduce the computationally efficient propagator method (PM) to estimate the elevation angles of the observed signals. In the quaternion algebra framework, we statistically eliminate the additive noise, which makes the PM method exhibit a robust performance in low SNR. By fully exploiting the direction information embedded in the velocity components, we achieve a high-resolution two-dimensional (2-D) DOA estimation result with a linear vector-hydrophone array. The simulations demonstrate that the proposed method offers stable estimation performance compared with the existing non-quaternion schemes without the need for any pair matching between the estimated azimuth and elevation angles.
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