双圈均匀圆阵互耦和位置误差的联合校正

Joint calibration of mutual coupling and position errors for dual uniform circular array

针对互耦误差和位置误差同时存在的情况,提出一种联合校正的方法.首先,算法设置2个辅助阵元,运用四阶累积量来扩展误差阵列,构造旋转不变子空间算法所需的旋转不变矩阵束,以满足多个辅助信源的高精度测角要求;然后,将估计出的辅助信源方位角作为已知值,通过轮换迭代解耦互耦误差和位置误差.本算法运用了双圈圆阵的阵列结构,降低了搜索维数.仿真结果表明本算法测角精度高、校正效果好.

A joint calibration method was proposed to solve the mutual coupling errors and position errors simultaneously.Fourth-order cumulant was used to expand the error array,and constructed the rotation invariant matrix for the estimation of signal parameters via rotational invariance technique(ESPRIT)algorithm.Two auxiliary elements were needed to satisfy the high-precision estimation of the multiple auxiliary sources.Then,the estimated angles of the auxiliary sources were taken as known values to participate in the solution of the mutual coupling errors and position errors.The two kinds of errors could be decoupled by using the alternating iterative method.In the algorithm,the array structure of dual circular array was used to reduce the search dimension.Simulation results show that the proposed algorithm has high accuracy and good calibration effect.