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DOA estimation based on fourth order cumulant beamforming for nonuniform linear array of DIFAR sonobuoys |
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| Authors: | Ali MassoudAuthor Vitae Abdallah OsmanAuthor Vitae |
| Affiliation: | a Electrical and Computer Engineering, Queen’s University, Kingston, ON, Canada b Geomatics Engineering, University of Calgary, Calgary, Alberta, Canada c Electrical and Computer Engineering, Royal Military College, Kingston, ON, Canada |
| Abstract: | The Directional Frequency Analysis and Recording (DIFAR) sonobuoy has been widely used in underwater target localization because it can capture more information than the Low Frequency Analysis and Recording (LOFAR) omnidirectional sonobuoy. Recently, array processing for fields of DIFAR sonobuoys has attracted considerable attention in order to enhance the direction of arrival (DOA) estimation performance and accuracy. DIFAR sonobuoys may become irregularly spaced due to the deployment method and the drift experienced once deployed, resulting in a nonuniform array. In this paper, we demonstrate the fourth-order cumulant beamforming (FOC-BF) technique to estimate the DOA for a nonuniform linear array of DIFAR sonobuoys. FOC-BF was compared with the conventional beamforming (CBF) through simulation works. The results show that FOC-BF provides better spatial spectrum with lower sidelobes than CBF. Furthermore, FOC-BF provides superior DOA estimation accuracy over CBF at very low signal to noise ratios (SNR). |
| Keywords: | LOFAR Low Frequency Analysis And Recording DIFAR Directional Frequency Analysis And Recording DOA direction of arrival SNR signal to noise ratio ULA uniform linear array CBF conventional beamforming MVDR minimum variance distortionless response CSM cross-spectral matrix MUSIC multiple signal classification ESPRIT estimation of signal parameter via rotational Invariance technique FOC fourth order cumulant FOC-BF fourth order cumulant beamforming MRLA minimum redundancy linear array |
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