摘要
针对经典相干宽带信号来波方向估计算法需要进行角度预估计、复杂度高等特点,提出一种均匀圆阵下宽带相干信号的二维来波方向(2D-DOA)估计新方法。先使用多项式展开的方法实现阵列流形矢量的频率与角度的分离,选取较简易的与频率有关的采样矩阵构造聚焦矩阵,然后利用聚焦操作求取宽带相干信号的频域相关矩阵进行2D-DOA估计。方法不需要进行角度预估计,减小了计算量。仿真分析表明,使用新的聚焦矩阵可以降低宽带相干信号2D-DOA估计的均方根误差,提高成功分辨概率。且该方法可推广至任意的阵列结构,并明显改善2D-DOA估计效果。
In view of the characteristics of classical wideband signal DOA estimation algorithms ot great compiextty and needing angle pre-estimation, a new method is presented for the 2D-DOA （Two-dimensional DOA） estimation of wideband coherent signals received by uniform circular array. The frequency parameter and angle parameter in array steering vector can be separated by polynomial expansion, and a simpler sampling matrix related to frequency parameter is selected to generate focused matrices. Then the wideband signals frequency-domain correlation matrix can be obtained by focusing operation and the 2D-DOA information of wideband signals can be estimated. The proposed method doesn＇t require angle pre-estlmation, and makes computational？ complexity reduced. Simulation analysis shows that the using of new focused matrix can reduce the root mean square error of 2D-DOA estimation of wideband coherent signals and improve the probability of successful separation. And this method can also be expanded to array with arbitrary forms and cause obvious improvement in performance of 2D-DOA estimation.
出处
《成都信息工程学院学报》
2015年第2期113-119,共7页
Journal of Chengdu University of Information Technology
基金
国家863计划资助项目(2012AA01A502)
四川省科技支撑计划资助项目(2014GZX0004)
关键词
宽带相干信号
来波方向估计
多项式展开
聚焦矩阵
频域相关矩阵
wideband coherent signal
direction of arrival estimation
polynomial expansion
focused matrix
frequency-domain correlation matrix
