一种改进的全阵空间平滑技术

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.

Improved Spatial Smoothing Technique Using Full Array

In the context of coherent signal source, conventional spatial smoothi ng methods such as forward/backward smoothing method, weighted forward/backward smoothing method can be used effectively. However, the currently known spati al smoothing algorithms not only are imperfect at low signal to noise ratio(SN R) or when the DOAs of coherent source are near, but also reduce effective aperture o f the array. Especially the number of coherent sources is large, conventional sp atial smoothing methods are invalid.In view of these problems,a new method is pr oposed which can perform well at low SNR from near directions. Simulation result s are provided to verify the superiority.