Abstract
The ESPAR antenna is usually a circular array antenna, and three pairs of diamond-shaped subarrays are produced because for seven elements, in particular, the ESPAR antenna will have a regular hexagonal shape with a feed element in the center. From this perspective, we propose a direction-of-arrival estimation method for coherent signals that applies three sets of spatial smoothing to the reactance-domain MUSIC method. First, we remove the effect of the mutual coupling of the elements by element-space transform, apply F/B spatial smoothing during the parallel motion of the three pairs of diamond subarrays, and determine three MUSIC spectra. Then, these spectra are averaged and combined. In an experiment in an anechoic chamber, the MUSIC method based on a four-element diamond-shaped subarray with a small array aperture is designated to have higher resolution than the beamformer method of a seven-element ESPAR antenna and exhibits the ability of the proposed method to estimate the direction of arrival with high resolution of coherent signals by a seven-element circular ESPAR antenna. © 2005 Wiley Periodicals, Inc. Electron Comm Jpn Pt 1, 88(12): 40–49, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecja.20207
Published Version
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