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Robust Signal Parameter Estimation in the Presence of Array Perturbations
Department of Electrical Engineering, Linköping University, S-581 83 Linköping, Sweden.ORCID iD: 0000-0002-1927-1690
Department of Electrical Engineering, Linköping University, S-581 83 Linköping, Sweden.ORCID iD: 0000-0003-2298-6774
Department of Electrical Engineering, Linköping University, S-581 83 Linköping, Sweden.
1991 (English)In: Proc. of 1991 International Conference on Acoustics, Speech, and Signal Processing, 1991. ICASSP-91., IEEE , 1991, 3277-3280 p.Conference paper, Published paper (Refereed)
Abstract [en]

Signal parameter estimators which are less sensitive to perturbations in the array manifold are presented. A parametrized stochastic model for the array uncertainties is introduced. The unknown array parameters can include the individual gain and phase responses of the sensors as well as their positions. Based on this model, a maximum a posteriori (MAP) estimator is formulated. This results in a fairly complex optimization problem which is computationally expensive. The MAP estimator is simplified by exploiting properties of the weighted subspace fitting method. An approximate method that further reduces the complexity is also presented, assuming smallarray perturbations. A compact expression for the MAP Cramer-Rao bound (CRB) on the signal and arrayparameter estimates is derived. A simulation study indicates that the proposed robust estimation procedures achieve the MAP-CRB even for moderate sample sizes.

Place, publisher, year, edition, pages
IEEE , 1991. 3277-3280 p.
Keyword [en]
Array signal processing, Frequency estimation, Parameter estimation, Phased arrays, Robustness, Sensor arrays, Sensor phenomena and characterization, Sensor systems, Stochastic processes, Uncertainty
National Category
Signal Processing
Identifiers
URN: urn:nbn:se:kth:diva-92638DOI: 10.1109/ICASSP.1991.150153OAI: oai:DiVA.org:kth-92638DiVA: diva2:514161
Conference
1991 International Conference on Acoustics, Speech, and Signal Processing, 1991. ICASSP-91. 14-17 Apr 1991, Toronto, Ont.
Note
NR 20140805Available from: 2012-04-05 Created: 2012-04-05 Last updated: 2013-09-05Bibliographically approved

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Wahlberg, BoOttersten, Björn

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