| 摘要: |
| 现有的基于子空间的波达方向估计算法都要求不相关信号源的数目小于阵元数目,但当信号源数目很多时,算法失效.为此,提出了一种具有过载估计能力的二维波达方向估计方法,先利用矩阵滤波技术接收数据进行预处理,使信号子空间限定在一个较小的区域内,把区域外的信号抑制掉,从而减小了有效的信号源数目,然后可以采用现有算法进一步估计二维波达方向.矩阵滤波器的设计过程也可以归结为一个最小二乘问题,效率很高.计算机仿真验证了算法的有效性. |
| 关键词: 二维波达方向 估计 矩阵滤波器 四阶累计量 |
| DOI：10.3969/j.issn.1001-893X. |
| Received:December 28, 2006Revised:April 03, 2007 |
| 基金项目: |
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| Two-dimensional Direction Finding Using Matrix Filter Technique |
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| Abstract: |
| Almost all the subspace - based DOA estimation algorithms fail when the number of source is more than the sensors. One solution to this problem is presented in this paper. A matrix filter is preprocess the received data matrix. The result is that the signal subspaces are confined to small used to angular sectors, so the effective number of signals present is reduced. Then the two - dimensional directions of signals in passband are estimated via cumulants -based DOA matrix method. The proposed method can improve the estimation ability to signals in passband without regard to all the interferences in stopband. Computer simulations prove the performance. |
| Key words: two-dimensional direction of arrival(DOA),estimation,matrix filter,four-order cumulant |
