DocumentCode :
1787784
Title :
Distributed source processing with linear nested arrays
Author :
Keyong Han ; Nehorai, Arye
Author_Institution :
Preston M. Green Dept. of Electr. & Syst. Eng., Washington Univ. in St. Louis, St. Louis, MO, USA
fYear :
2014
fDate :
22-25 June 2014
Firstpage :
521
Lastpage :
524
Abstract :
We consider the problem of using linear nested arrays to estimate the direction of arrival (DOA) of spatially distributed sources and detect the source number, where we have more sources than the actual physical sensors. Angular spread, caused by the multipath nature of distributed sources, makes the commonly used point source assumption ineffective. In this paper, we establish the signal model for distributed sources using a nested array. Due to the characteristics of distributed sources, the regular spatial smoothing technique, which is used to exploit the increased degrees of freedom provided by the co-array, no longer works. We thus propose a novel spatial smoothing approach to circumvent this problem. Based on the analytical results, we construct corresponding DOA estimation and source number detection methods. The effectiveness of the proposed methods is verified through numerical examples.
Keywords :
array signal processing; direction-of-arrival estimation; distributed processing; signal detection; smoothing methods; DOA estimation; angular spread; degrees of freedom; direction of arrival estimation; distributed source processing; linear nested arrays; physical sensors; point source assumption; regular spatial smoothing technique; signal model; source number detection methods; spatially distributed sources; Arrays; Direction-of-arrival estimation; Estimation; Manifolds; Multiple signal classification; Smoothing methods; Vectors; Distributed source; direction of arrival estimation; nested array; source number detection;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Sensor Array and Multichannel Signal Processing Workshop (SAM), 2014 IEEE 8th
Conference_Location :
A Coruna
Type :
conf
DOI :
10.1109/SAM.2014.6882457
Filename :
6882457
Link To Document :
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