基于ESPRIT算法的柱面共形阵列天线DOA估计

DOA estimation for cylindrical conformal array antenna based on ESPRIT algorithm

由于共形天线阵列流形的多极化特性(polarization diversity,PD),信源方位参数与极化状态的"耦合"是实现共形阵列天线波达方向(direction-of-arrival,DOA)估计的主要难点。针对柱面共形阵列天线的特点,建立了柱面共形阵列天线的导向矢量模型;通过合理的阵元排列结构设计,结合ESPRIT(esti mation of signalparameters via rotational invariance techniques)算法参数估计的特点,实现了信源极化状态与方位参数的去耦合,推导了ESPRIT算法多参数估计的参数配对方法,最终提出了柱面共形阵列天线盲极化DOA估计算法。计算机Monte Carlo仿真实验验证了所提算法的有效性。

Due to the polarization diversity of conformal array manifold,the coupling between polarization parameters and bearings of source is the distinct difficulty in direction-of-arrival（DOA） estimation of conformal array antennas.In view of the characteristic of cylindrical conformal array antennas,an array manifold model for cylindrical conformal array is established.With the help of well-designed configuration of elements on cylindrical carriers and estimation of signal parameters via rotational invariance techniques（ESPRIT） algorithm,the decoupling method for DOA and polarization parameters is implemented.The parameters pairing method of ESPRIT is given when DOA of multiple sources is estimated.On this basis,a blind DOA estimation algorithm for cylindrical conformal array antenna with respect to polarization diversity is proposed.Monte-Carlo simulation results are provided to demonstrate the effectiveness of the proposed method.