NDLI: Statistical modal analysis applied to near-field measurements of random emissions

Content Provider	IEEE Xplore Digital Library
Author	Fourestie, B. Altman, Z. Bolomey, J.-C. Wiart, J. Brouaye, F.
Copyright Year	1963
Abstract	The problem of near-field to far-field transformation of narrow-band incoherent electromagnetic fields is analyzed. The coherence matrix of signals sampled in the time domain on a surface enclosing incoherent sources is derived. Two equivalent formulations based on the processing of the coherence matrix are introduced: The signal subspace analysis and the bimodal transformation. In the signal-subspace approach, the coherence matrix is processed using a method based on singular value decomposition, giving rise to a set of functions on the surface enclosing the incoherent sources. Each of these functions is individually transformed to the far field via a modal decomposition and the sum of the transformed functions gives the total far field. In the second formulation, the bimodal transformation is used to transform the near field coherence matrix into the far field coherence matrix from which the far-field pattern is derived. The applications of the proposed transformations in the presence of noise are illustrated. A numerical example using incoherent radiating dipoles inside a leaking wire-grid enclosure validates the two formulations of near-field to far-field transformation. The proposed methodology gives the mathematical foundation for designing a compact time domain measurement facility well suited to incoherent electromagnetic radiation.
Sponsorship	IEEE Antennas and Propagation Society
Starting Page	1803
Ending Page	1812
Page Count	10
File Size	745034
File Format	PDF
ISSN	0018926X
Volume Number	50
Issue Number	12
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-12-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Modal analysis Matrix decomposition Electromagnetic measurements Signal processing Narrowband Electromagnetic fields Electromagnetic analysis Signal analysis Singular value decomposition Time measurement
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering

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