Localization of Near-Field Sources in Spatially Colored Noise

Abstract

This paper presents near-field localization of unintended emitting radio-controlled (RC) sources in a colored noise environment using a uniform linear array antenna. Existing localization methods for RC devices perform satisfactorily under white noise, but they ignore multipath fading or correlation among the sources. Therefore, a suite of novel schemes, referred to as 2-D multiple signal classification (MUSIC)-smooth sparse arrays and 2-D MUSIC-whitened noise, is proposed to bring correlation together among the sources, multipath fading, and color noise effects during near-field location estimation. Experimental evaluation of the proposed methods and the original smooth 2-D MUSIC compares both schemes while demonstrating their effectiveness.Index Terms-Array signal processing, colored noise, direction of arrival (DOA), multiple signal classification (MUSIC), near-field localization, range estimation, spatial smoothing.

Analysis of localization methods for unintended emitting sources

“…In addition, localization methods [4][5][6][7][8][9][10] assume that noise in the environment has white Gaussian characteristics, but this may not be true-especially for practical applications. In [12], this assumption is relaxed using two well separated antenna arrays. Locations of devices are estimated with the cross-covariance matrix of the separated arrays.…”

“…Most of the localization methods [4][5][6][7][8][9][10][11][12] neglect the effect of elevation and consider the azimuth angle as the direction of arrival (DOA). However applications such as an aerial vehicle locating ground-based sources require the estimation of elevation angles.…”

“…In our previous work [11,12], localization and tracking of unintended emitting devices were provided by experimental results. In this paper, analysis of localization and tracking methods is reported by considering different aspects such as the location of sources and number of antennas.…”

“…In this paper, analysis of localization and tracking methods is reported by considering different aspects such as the location of sources and number of antennas. This analysis is also utilized to verify the performance of our methods [11,12] via computer simulations and to observe whether or not the near-field approximation considered in our previous work is satisfactory.…”