Abstract
A dual-polarized multiple signal classification (DP-MUSIC) algorithm is presented to estimate the arrival directions and polarizations for a dual-polarized conformal array. Each polarization signal is decomposed into two orthogonal polarization components, which are considered to be a pair of coherent signals coming from the same direction but different polarization. The polarization parameters are modeled as the equivalent coherence coefficients of the orthogonal polarization components. Then, the method of decoherence can be used to decouple the information of polarization states and signal angles. After that, the direction of arrival (DOA) and polarization parameters can be estimated by the DP-MUSIC algorithm. Moreover, the angles of incident direction are re-estimated, which greatly improves the accuracy of DOA estimation. The Cramer–Rao bound (CRB) is derived and the effectiveness of the proposed algorithm is verified by Monte Carlo simulations.
Highlights
Conformal array is an antenna array that conforms to the surface of the carrier
E multiple signal classification (MUSIC) algorithm was proposed by Schmidt to estimate the direction of arrival (DOA) of the signal in [2]
Each polarization signal is decomposed into two orthogonal polarization components, which are considered to be a pair of coherent signals
Summary
Conformal array is an antenna array that conforms to the surface of the carrier. Conformal antennas have been widely applied in the area of radar, navigation, radio communications, and satellite applications with their special advantages [1]. In [4], a method for estimating the arrival direction of array interpolation based on compressed sensing was proposed These algorithms leave out of consideration the effects of polarization of antenna elements. In [8], a blind polarization DOA estimation method was proposed by using three pairs of special subarrays for conical conformal array. In [12], DOA and polarization estimation for unequal power sources was proposed based on reconstructed noise subspace This method is not suitable for conformal arrays. In [13], a blind polarization DOA estimation method was proposed based on the dual feed conformal array for polarization diversity signals. The validity of the proposed algorithm is demonstrated by simulation experiments
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