Single Snapshot Spatial Smoothing With Improved Effective Array Aperture

Spatial smoothing is a widely used preprocessing scheme for direction-of-arrival (DOA) estimation of more than one source from a single snapshot, although the effective array aperture gets reduced by this process. In this paper we propose a preprocessing scheme applicable for DOA estimation algorith...

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Bibliographic Details
Published in:IEEE signal processing letters 2009-06, Vol.16 (6), p.505-508
Main Authors: Thakre, A., Haardt, M., Giridhar, K.
Format: Article
Language:English
Subjects:
Apertures
Arrays
Centro-symmetric array
Computer simulation
Direction of arrival estimation
ESPRIT
Gain
Gaussian noise
Linear antenna arrays
Mathematical analysis
Performance gain
Preprocessing
Radar applications
Sensor arrays
Sensor phenomena and characterization
Smoothing methods
Spatial smoothing
spatial smoothing with improved aperture (SSIA)
Symmetric matrices
Vectors (mathematics)
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Summary:Spatial smoothing is a widely used preprocessing scheme for direction-of-arrival (DOA) estimation of more than one source from a single snapshot, although the effective array aperture gets reduced by this process. In this paper we propose a preprocessing scheme applicable for DOA estimation algorithms that exploit the shift invariance property of the array steering matrix and call it spatial smoothing with improved aperture (SSIA). SSIA, when applied to a noise corrupted data vector, improves the effective array aperture significantly as opposed to conventional spatial smoothing. Simulations confirm the significant performance gain provided by SSIA in conjunction with Unitary ESPRIT.
ISSN:1070-9908
1558-2361
DOI:10.1109/LSP.2009.2017573