摘要
针对DOA估计中可测信源数目不足的问题,提出了一种基于Toeplitz矩阵重构的嵌套阵DOA估计算法。首先设计二级嵌套阵,通过对阵列接受信号进行积处理,将阵列扩展为虚拟均匀线阵,然后利用处理后的信号重构Toeplitz矩阵,通过特征值分解,结合MUSIC算法在阵元数目小于信源数目条件下实现了高精度DOA估计。算法增加了阵列孔径,提高了阵列自由度。而且在低信噪比和小快拍下情况下也具有较好的性能。仿真结果证明了算法的有效性。
A nested array DOA estimation algorithm based on Toeplitz matrix reconstruction is proposed for the problem of insufficient number of measurable sources in DOA estimation.Firstly,the two-level nested array is designed.The array is extended to the virtual uniform linear array by the product processing of the array signal,and then the Toeplitz matrix is reconstructed by using the processed signal.By the eigenvalue decomposition and the MUSIC algorithm,The high accuracy DOA estimation is realized under the condition of the number of sources.The algorithm increases the array aperture and improves the array DOF.But also in the case of low signal to noise ratio and small snapshots also have better performance.The simulation results show the effectiveness of the algorithm.
作者
韩佳辉
毕大平
陈璐
张云鹏
HAN Jia-hui;BI Da-ping;CHEN Lu;ZHANG Yun-peng(Electronic Countermeasure Institute,National University of Defense Technology,Hefei 230037,China)
出处
《火力与指挥控制》
CSCD
北大核心
2018年第10期105-108,共4页
Fire Control & Command Control
