摘要
对于实际环境中存在的多径现象和阵元间的互耦效应,提出一种互耦效应下针对相干源的波达方向估计算法。首先,通过波达方向矩阵法利用二阶矩求出互耦效应下的广义导向矢量;然后对广义导向矢量进行子空间平滑,通过矩阵变换得到一个线性约束下的规划问题,实现相干源方位和互耦系数的级联估计。该算法只需利用二阶矩求得广义导向矢量,相比常规的四阶累积量方法,减少了计算量;本文算法在解互耦和解相干过程中都没有损失阵列孔径,极大提高了阵元利用效率。计算机仿真结果验证了该算法的有效性。
A method dealing with direction of arrival（DOA） of coherent signals in the presence of mutual coupling is proposed. Firstly, the generalized steering vector is obtained through DOA matrix method based on the second-order statistics. Secondly, subspace smoothing is applied to generalized steering vector and a linear constrained programming problem is obtained by matrix transform. So DOA and coefficients of mutual coupling can be estimated sequentially. Compared with the fourth-order cumulant method, the computation load is reduced with the second-order statistics. And there is no loss of array elements, which means less array elements are needed in this method. Computer simulations prove the effectivity of the proposed method.
出处
《数据采集与处理》
CSCD
北大核心
2016年第4期693-701,共9页
Journal of Data Acquisition and Processing
基金
国家自然科学基金(61072132)资助项目
信息综合控制国家重点实验室资助项目
关键词
波达方向估计
互耦
解相干
广义导向矢量
direction of arrival（DOA） estimation
mutual coupling
decorrelation
generalized steering vector
