Vol. 113

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2011-01-25

Joint Azimuth-Elevation/(-Range) Estimation of Mixed Near-Field and Far-Field Sources Using Two-Stage Separated Steering Vector-Based Algorithm

By Junli Liang, Ding Liu, Xianju Zeng, Wenyi Wang, Jiulong Zhang, and Hongyang Chen
Progress In Electromagnetics Research, Vol. 113, 17-46, 2011
doi:10.2528/PIER10110104

Abstract

Passive source localization has wide applications in array signal processing. In the practical applications, the observations collected by an array may be ``arbitrary"-field signals, i.e., which are either mixed near-field and far-field signals or multiple near-field signals or multiple far-field signals. With a cross array, a two-stage separated steering vector-based algorithm is developed to localize ``arbitrary"-field narrowband sources in the spherical coordinates. The key points of this paper are: i) different physical steering vectors of near-field and far-field sources are transformed into the virtual ones with the same form, thus linearizing the quadratic phases of near-field sources and allowing the same operations for near-field and far-field sources; ii) the virtual steering vector is separated into two parts and restored by introducing a special phase angle, and thus it is used to estimate the azimuth-elevation arrival-angles of ``arbitrary"-field sources; and iii) special Hermitian matrices are constructed using the separated physical steering vector and their eigenvalue decomposition (EVD) are performed, thus the ranges of near-field sources are easily obtained from the eigenvector being corresponding to the smallest eigenvalue. The proposed algorithm can localize ``arbitrary"-field sources without pairing parameters and multidimensional search. Simulation results are provided to validate the performance of the proposed method.

Citation


Junli Liang, Ding Liu, Xianju Zeng, Wenyi Wang, Jiulong Zhang, and Hongyang Chen, "Joint Azimuth-Elevation/(-Range) Estimation of Mixed Near-Field and Far-Field Sources Using Two-Stage Separated Steering Vector-Based Algorithm," Progress In Electromagnetics Research, Vol. 113, 17-46, 2011.
doi:10.2528/PIER10110104
http://jpier.org/PIER/pier.php?paper=10110104

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