Resolution threshold of beamspace MUSIC for two closely spaced emitters

An analysis of a beamspace version of the MUSIC algorithm applicable to two closely spaced emitters in diverse scenarios is presented. Specifically, the analysis is applicable to uncorrelated far-field emitters of any relative power level, confined to a known plane, and observed by an arbitrary arra...

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Bibliographic Details
Published in:IEEE transactions on acoustics, speech, and signal processing speech, and signal processing, 1990-09, Vol.38 (9), p.1545-1559
Main Authors: Lee, H.B., Wengrovitz, M.S.
Format: Article
Language:English
Subjects:
Algorithm design and analysis
Applied sciences
Array signal processing
Colored noise
Exact sciences and technology
Information, signal and communications theory
Multiple signal classification
Navigation
Noise reduction
Sensor arrays
Signal and communications theory
Signal representation. Spectral analysis
Signal resolution
Signal to noise ratio
Signal, noise
Spatial resolution
Telecommunications and information theory
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Summary:An analysis of a beamspace version of the MUSIC algorithm applicable to two closely spaced emitters in diverse scenarios is presented. Specifically, the analysis is applicable to uncorrelated far-field emitters of any relative power level, confined to a known plane, and observed by an arbitrary array of omnidirectional sensors. An expression for the threshold array signal-to-noise ratio at which beamspace MUSIC is able to resolve the emitters is obtained. The preprocessor that minimizes the resolution threshold is identified. It is demonstrated that the resolution threshold is proportional to the dimension of the noise subspace; therefore, the threshold can be reduced substantially by utilizing an appropriate beamformer to reduce the dimension of the noise subspace. It is also demonstrated that MUSIC in conjunction with a suitable preprocessor can provide a resolution threshold lower than conventional (sensor-space) MinNorm.< >
ISSN:0096-3518
DOI:10.1109/29.60074