DocumentCode :
2165185
Title :
Two dimensional nested arrays on lattices
Author :
Pal, Piya ; Vaidyanathan, P.P.
Author_Institution :
Dept. of Electrical Engineering, MC 136-93, California Institute of Technology, Pasadena, 91125, USA
fYear :
2011
fDate :
22-27 May 2011
Firstpage :
2548
Lastpage :
2551
Abstract :
In this paper, we develop the theory of a new class of two dimensional arrays with sensors on lattice(s) which can be used to construct a virtual array of much larger size through passive processing. This structure is obtained by systematically nesting two arrays, one with sensors suitably placed on a sparse lattice and the other on an appropriately chosen dense lattice. The difference co-array of such an array with M and N elements respectively on the two lattices, is proved to be a larger two dimensional array with O(MN) sensors present contiguously (without holes) on the dense lattice. It will be shown that there is complete freedom to choose the sparse and dense arrays as long as they are related by an integer matrix (which can also be arbitrarily chosen). To exploit the increased degrees of freedom offered by the array for two dimensional DOA estimation of more sources than sensors, a novel algorithm based on the concept of two dimensional spatial smoothing is also proposed. The validity of the proposed methods is verified through numerical examples.
Keywords :
Direction of arrival estimation; Estimation; Lattices; Matrix decomposition; Sensor arrays; Smoothing methods; 2D DOA estimation; Smith form; co-array; lattice arrays; spatial smoothing;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Acoustics, Speech and Signal Processing (ICASSP), 2011 IEEE International Conference on
Conference_Location :
Prague, Czech Republic
ISSN :
1520-6149
Print_ISBN :
978-1-4577-0538-0
Electronic_ISBN :
1520-6149
Type :
conf
DOI :
10.1109/ICASSP.2011.5947004
Filename :
5947004
Link To Document :
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