摘要
在处理相干信号源的方法上,传统的空间平滑方法如前后向平滑、加权前后向平滑等都是非常有效的方法。然而,已有的空间平滑算法在信噪比较低或相干源的波达方向角(DOA)相邻很近时无法精确估计,而且都必须以牺牲孔径为代价。因此当信号源数目较大时,传统的空间平滑方法是无效的。针对这些问题,提出了一种新的实相干信号的估计方法,在信噪比较低时仍可以准确估计邻近的相干源,而且没有孔径损失。仿真结果验证了该方法的优越性。
In the context of coherent signal source, conventional spatial smoothing methods such as forward/ backward smoothing method, weighted forward/backward smoothing method can be used effectively. However, the currently known spatial smoothing algorithms not only are imperfect at low signal-to-noise ratio（SNR） or when the DOAs of coherent source are near, but also reduce effective aperture of the array. Especially the num- ber of coherent sources is large, conventional spatial smoothing methods are invalid. In view of these problems, a new method is proposed which can perform well at low SNR from near directions. Simulation results are provided to verify the superiority.
出处
《电讯技术》
北大核心
2010年第3期37-41,共5页
Telecommunication Engineering
关键词
相干源
波达方向估计
空间平滑
coherent source
DOA estimation
spatial smoothing
