互耦误差下环形共形阵列多参数联合估计

A Joint Multiple Parameters Estimation for Sphere Conformal Array Blind in the Presence of Mutual Coupling

针对球面环形共形阵列互耦误差校正问题,给出了一种自校正算法。通过合理的阵元排列结构,结合共形阵列流型特点,利用互耦矩阵的Toeplitz性、子空间原理和秩损理论,通过二维搜索,实现了信源方位、极化和互耦系数的联合估计。该算法不需要任何先验信息,估计精度高、分辨力强。对参数估计的一致性进行了分析推导,并给出了参数估计的CRB(cramer-rao bound),MATLAB仿真证明该算法可以实现环形共形阵列互耦误差校正。

Aim at calibration of spherical torus conformal array antenna mutual coupling errors,a self-calibration is proposed in this paper.The special manifold characteristic of conformal array is considered here.According to the reasonable antenna layout,based on subspace theory,rank-deficiency theory and the characteristic of Toeplitz matrices,a joint DOA,polarization and array mutual coupling parameters estimation algorithm which only needs two-dimensional parameter searching is proposed.The proposed method can achieve accurate and high-resolution DOA estimation without the exact knowledge of the source polarization and mutual coupling.The theory performance is analyzed and the CRB(Cramer-Rao Bound)is derived for this algorithm.At the end of this paper,MATLAB simulation shows that this algorithm can solve the mutual coupling error correction of pherical torus conformal array antenna.