Sparse Active Rectangular Array with Few Closely Spaced Elements

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Abstract

Sparse sensor arrays offer a cost effective alternative to uniform arrays. By utilizing the co-array, a sparse array can match the performance of a filled array, despite having significantly fewer sensors. However, even sparse arrays can have many closely spaced elements, which may deteriorate the array performance in the presence of mutual coupling. This paper proposes a novel sparse planar array configuration with few unit inter-element spacings. This Concentric Rectangular Array (CRA) is designed for active sensing tasks, such as microwave or ultrasound imaging, in which the same elements are used for both transmission and reception. The properties of the CRA are compared to two well-known sparse geometries: the Boundary Array and the Minimum-Redundancy Array (MRA). Numerical searches reveal that the CRA is the MRA with the fewest unit element displacements for certain array dimensions.

Original languageEnglish
Pages (from-to)1820-1824
JournalIEEE Signal Processing Letters
Volume25
Issue number12
DOIs
Publication statusPublished - 2018
MoE publication typeA1 Journal article-refereed

Keywords

  • Array signal processing
  • Imaging
  • Mutual coupling
  • mutual coupling
  • Phased arrays
  • Planar arrays
  • Sensor arrays
  • Sparse array
  • sum co-array

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