二维相干信号测向估计方法

针对双平行线阵列,提出了一种相干信号二维波达方向估计新方法.该方法利用双平行线阵的特点,在空间平滑法基础上通过构造新的协方差矩阵,进一步去除了信源间的相干性.相对空间平滑法计算量无明显增加,并且利用信号的方向矢量元素来直接估计信号角度.该方法不需要谱峰搜索,大大减小了运算量,具有分辨率高和估计方差小的优点.最后,通过仿真说明了该方法的有效性.

Approach to 2-D angles direction estimation for coherent signals

A new method for estimating two-dimensional(2-D) direction of arrival(DOA) in coherent signals environment is presented with two parallel linear arrays.A new covariance matrix based on the spatial smoothing method is constructed by the characteristic of the arrays,and the coherence between the signals is further solved.The computational complexity has no increase obviously compared with the spatial smoothing method,and the signal angle is estimated by using the signal direction vectors.The spectral peak searching is not needed so as to reduce the computational load greatly.The proposed method still has the advantages of high solution and little variance.Simulation indicates that the method is effective.