Direction-finding with sparse rectangular dual-size spatial invariance array

Kainam Thomas Wong, Michael D. Zoltowski

Research output: Journal article publicationJournal articleAcademic researchpeer-review

76 Citations (Scopus)


A novel sparse array geometry embedding two sizes of spatial invariances is presented for use with a new ESPRIT-based (estimation of signal parameters via rotational invariance techniques) algorithm for aperture extension. The half-wavelength invariance yields unambiguous but high-variance direction cosine estimates to disambiguate low-variance but cyclically ambiguous estimates from the larger invariance. With larger invariance at 60 half-wavelengths, resolution threshold for two closely spaced emitters is reduced by 50 dB and estimation error by 100-fold. Array design formulas are also presented.
Original languageEnglish
Pages (from-to)1320-1335
Number of pages16
JournalIEEE Transactions on Aerospace and Electronic Systems
Issue number4
Publication statusPublished - 1 Dec 1998
Externally publishedYes

ASJC Scopus subject areas

  • Aerospace Engineering
  • Electrical and Electronic Engineering


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