Abstract
Most conventional direction-of-arrival (DOA) estimation algorithms are affected by the effect of mutual coupling, which make the performance of DOA estimation degrade. In this paper, a novel DOA estimation algorithm for conformal array in the presence of unknown mutual coupling is proposed. The special mutual coupling matrix (MCM) is applied to eliminate the effect of mutual coupling. With suitable array design, the decoupling between polarization parameter and angle information is accomplished. The two-demission DOA (2D-DOA) estimation is finally achieved based on estimation of signal parameters via rotational invariance techniques (ESPRIT). The proposed algorithm can be extended to conical conformal array as well. Two parameter pairing methods are illustrated for cylindrical and conical conformal array, respectively. The computer simulation verifies the effectiveness of the proposed algorithm.
Highlights
DOA estimation is a major part of array signal processing which is applied in various areas, such as smart antenna, wireless communication system, radar, sonar, and seismology [1,2,3,4,5]
In order to eliminate the effect of mutual coupling, the first and last q elements of the M = (M − 2q)-elements ULA are selected as instrumental elements [17]
We can deal with the coupling between the polarization parameters and the signal parameters after the mutual coupling is eliminated
Summary
DOA estimation is a major part of array signal processing which is applied in various areas, such as smart antenna, wireless communication system, radar, sonar, and seismology [1,2,3,4,5] The conventional algorithms such as the multiple signal classification (MUSIC) [6] and estimation of signal parameters via rotational invariance techniques (ESPRIT) [7] possess super-resolution ability. The reconstitution MCM can be used to eliminated the mutual coupling effect [17] This method circumvented the difficulty of dealing with coherent signals in 2D-DOA estimations based on maximum likelihood (ML) method. A novel DOA estimation algorithm for conformal array in the presence of unknown mutual coupling is proposed.
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