一种存在阵列误差情况下的宽带DOA估计方法

DOA Estimation Algorithm for Wideband Signal under Array Errors

相对于窄带信号,宽带信号阵列模型误差更加复杂和多样。文章首先给出了宽带信号条件下的阵列误差模型,利用四阶累积量估计出各频点上实际的方向矩阵,然后利用总体最小二乘(TLS)算法给出了一种存在阵列误差情况下的聚焦矩阵的求法。仿真结果表明此方法在存在阵列误差时DOA估计精度较高,稳健性好。

Compared to narrowband signal, the array errors of broadband signal are more complex and diverse. This paper first gives the array error model under the conditions of broadband signal, and estimates the direction matrix of choosing frequency point using fourth-order cumulants, and then uses coherent signal subspace total Least Squares （TLS） algorithm to give a focusing matrix solution under array errors. The simulation results show that this method is stable and good in the presence of array errors.