摘要
针对信源数估计不准确会导致超分辨波达方向估计失败的问题,利用接收信号中有用信号自身的相关性以及有用信号和噪声的非相关性,提出了一种信源数未知的高精度波达方向估计方法,该方法采用时间平滑技术,得到组合空时自相关矩阵,再利用上述矩阵构造空间谱函数,无需对自相关矩阵进行特征分解运算就可进行波达方向估计。仿真结果表明,在信源数未知条件下,所提算法的估计精度接近于超分辨MUSIC算法,且具有较小的运算复杂度,为提高波达方向估计性能提供了依据。
If the source number is estimated inaccurately,the DOA estimation may fail. In order to solve this problem,a high resolution DOA estimation algorithm without knowing the source number is presented by using the correlation of the useful signal and the uncorrelation between useful signal and noise. Temporal smoothing is used to obtain a combined spatio-temporal autocorrelation matrix. Then,the spatial spectrum function is constructed based on the matrix without eigenvalue decomposition. Simulation results show that the estimation precision of the proposed algorithm is close to the high resolution MUSIC algorithm and it also has a low computing complexity.
出处
《计算机仿真》
CSCD
北大核心
2015年第7期173-177,共5页
Computer Simulation
基金
广西自然科学基金项目(2013GXNSFFA019004)
广西无线宽带通信与信号处理重点实验室主任基金(12107)
广西教育厅重点项目(ZD2014052)
关键词
波达方向估计
信源数
高精度
时间平滑
Direction of arrival
Source number
High resolution
Temporal smoothing
