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Titolo:
WAVES: Weighted average of signal subspaces for robust wideband direction finding
Autore:
Di Claudio, ED; Parisi, R;
Indirizzi:
Univ Roma La Sapienza, INFOCOM Dept, Rome, Italy Univ Roma La Sapienza Rome Italy La Sapienza, INFOCOM Dept, Rome, Italy
Titolo Testata:
IEEE TRANSACTIONS ON SIGNAL PROCESSING
fascicolo: 10, volume: 49, anno: 2001,
pagine: 2179 - 2191
SICI:
1053-587X(200110)49:10<2179:WWAOSS>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
PERFORMANCE ANALYSIS; COVARIANCE MATRICES; MAXIMUM-LIKELIHOOD; FOCUSING MATRICES; MUSIC ALGORITHM; SOURCE LOCATION; MODEL ERRORS; ARRAY; ARRIVAL; ANGLES;
Keywords:
array processing; coherent wideband focusing; robust statistics; subspace fitting;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
--discip_EC--
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Di Claudio, ED Univ Roma La Sapienza, INFOCOM Dept, Rome, Italy Univ Roma La Sapienza Rome Italy FOCOM Dept, Rome, Italy
Citazione:
E.D. Di Claudio e R. Parisi, "WAVES: Weighted average of signal subspaces for robust wideband direction finding", IEEE SIGNAL, 49(10), 2001, pp. 2179-2191

Abstract

Existing algorithms for wideband direction finding are mainly based on local approximations of the Gaussian log-likelihood around the true directionsof arrival (DOAs), assuming negligible array calibration errors. Suboptimal and costly algorithms, such as classical or sequential beamforming, are required to initialize a local search that eventually furnishes DOA estimates. This multistage process may be nonrobust in the presence of even small errors in prior guesses about angles and number of sources generated by inherent limitations of the preprocessing and may lead to catastrophic errors in practical applications. In this paper, a new approach to wideband direction finding is introduced and described. The proposed strategy combines a robust near-optimal data-adaptive statistic, called the weighted average of signal subspaces (WAVES), with an enhanced design of focusing matrices to ensure a statistically robust preprocessing of wideband data. The overall sensitivity of WAVES to various error sources, such as imperfect array focusing, is also reduced with respect to traditional CSSM algorithms, as demonstrated by extensive Monte Carlo simulations.

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Documento generato il 09/04/20 alle ore 12:31:32