【作者】 侯慧军； 毛兴鹏； 果然； 刘爱军；

【Author】 HOU Hui-jun;MAO Xing-peng;GUO Ran;LIU Ai-jun;School of Electronics and Information Engineering,Harbin Institute of Technology;

【机构】 哈尔滨工业大学电子与信息工程学院；

【摘要】 针对来波信号功率不同情形下的波达方向估计问题,构建广义斜投影算子自适应抑制阵列接收数据中非期望方向的接收信号。同时自适应调节空间谱加权系数,平衡强弱信号的空间谱峰。通过干扰抑制和空间谱估计的同步处理,实现了信号源波达方向(direction of arrival,DOA)参量的高分辨估计,且避免了弱信号的空间谱峰被强信号谱峰所遮盖的问题。分析与仿真表明,所提方法对信号功率不同时的DOA估计,特别是弱信号的DOA估计具有较强的鲁棒性,可有效地实现不同方向来波信号的高分辨波达方向估计,且DOA估计方差逼近相应的克拉美罗界(cramer-rao bound,CRB)下限。更多还原

【Abstract】 To solve the problem of bearing estimation,generalized oblique projection operators are constructed to cancel incident signals coming from undesired directions.Since the signals impinging on the array may have different power,one kind of weighting factor is used to balance the height of the spactial spectrum adaptively.Through the synchronous processing of suppressing interference and implementing spatial spectrum estimation,a high resolution of the source’s direction of arrival(DOA)parameters is realized and the phenomenon that the peaks of weak signals being covered by strong ones is avoided.Both the theoretical analyses and the numerical simulation experiments indicate that the proposed approach has good robustness against direction finding of signals,especially the weak sources,with distinct power.And a high resolution of signals’ DOA parameters can be efficiently achieved with different incident angles.What’s more,the standard deviations of the estimated DOAs are closely close to the corresponding cramer-rao bound(CRB).更多还原