On the resolution capacity of wideband sensor arrays

Yoram Bresler, Anthony J. Ficker

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Summary form only given. The superresolution estimation of bearings of wideband sources using fewer sensors than sources has been addressed. The fundamental limits on the maximum number, Dmax, of wideband sources uniquely resolvable by a passive sensor array, called the resolution capacity of the array, has been studied. The source signals are assumed to be uncorrelated zero-mean, second-order stationary, and ergodic wideband random processes occupying a common bandwidth. The array is assumed to be uniform and linear, and L >> 1 Nyquist-rate samples of its output are assumed to be collected into a snapshot supervector. N >> 1 such snapshots are assumed to be available. It has been shown that if each of the source power spectral densities is specified by M unknown parameters, then a (not necessarily sharp) bound is given by Dmax ≤ L(2K - 1)/(M + 1), where K is the number of sensors. Furthermore, if each of the source power spectral densities can be represented by a weighted sum of M linearly independent basis functions, a sharp upper bound on D can be obtained in terms of the rank of a certain matrix that depends on the specific basis functions chosen. For the specific case of M basis functions derived from linear combinations of polynomials or order less than M + 1, the bound Dmax = KL/(2M), which is tight, has been obtained. These results suggest that in the case of uncorrelated wideband signals, the resolution capacity of a given array is essentially limited only by the observation interval, rather than by the number of sensors.

Original languageEnglish (US)
Title of host publicationSixth Multidimens Signal Process Workshop
Editors Anon
PublisherPubl by IEEE
Number of pages2
StatePublished - 1989
EventSixth Multidimensional Signal Processing Workshop - Pacific Grove, CA, USA
Duration: Sep 6 1989Sep 8 1989


OtherSixth Multidimensional Signal Processing Workshop
CityPacific Grove, CA, USA

ASJC Scopus subject areas

  • Engineering(all)

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