摘要
相干源常见于存在多径的场景,如何解相干历来是阵列信号处理领域亟待解决的难题之一,特别针对空间临近相干源,其角度估计精度尚有待提高。针对空间临近相干源该文提出一种基于空域滤波的角度估计方法。首先利用空域滤波技术将多个相干源分离,再对滤波分离后的各个信号分别进行角度估计,并通过对滤波器系数和相干源角度的迭代优化提高测角精度。针对非均匀线阵,该方法采用虚拟阵列技术扩展其适用范围。计算机仿真结果表明该方法的测角精度较现有方法更高,信噪比较高时其测角的均方根误差可达克拉美罗界,验证了该方法的有效性和在空间临近相干源场景的优越性。
Coherent sources commonly exist in scenarios with multipath effect. How to decorrelate coherent sources is traditionally a problem urgently to be solved in the array signal processing domain. Especially for spatially adjacent coherent sources, the performance of the estimation of Direction Of Arrival （DOA） remains to be improved. A DOA estimation method based on spatial filtering is proposed for spatially adjacent coherent sources. Multiple coherent sources are separated by spatial filtering and the DOAs are estimated respectively afterwards. The performance of the DOA estimation is enhanced by refining the filter parameters and the DOAs of the coherent sources iteratively. To extend its application to non-uniform linear array, the virtual array technique is adopted. The computer simulation results indicate that the proposed algorithm has better DOA estimation performance than the existing methods. In the scenario of sufficiently high Signal to Noise Ratio （SNR）, the Root Mean Square Error （RMSE） could achieve Cramer-Rao Bound （CRB）. The effectiveness and the superiority of the proposed method for spatially adjacent coherent sources are validated by the simulation results.
作者
郑轶松
陈伯孝
杨明磊
ZHENG Yisong CHEN Baixiao YANG Minglei(National Laboratory of Radar Signal Processing, Xidian University, Xi＇an 710071, China Collaborative Innovation Center of Information Sensing and Understanding at Xidian University, Xi＇an 710071, China)
出处
《电子与信息学报》
EI
CSCD
北大核心
2016年第12期3100-3106,共7页
Journal of Electronics & Information Technology
基金
国家自然科学基金(61571344)
上海航天科技创新基金(SAST2015071
SAST2015064)~~
关键词
雷达信号处理
来波方向估计
空间临近相干源
空域滤波
解相干
Radar signal processing
DOA estimation
Spatially adjacent coherent sources
Spatial filtering
Decorrelation
