基于虚拟时间延迟线阵列的联合频率—到达角二维谱估计

提出基于虚拟时间延时线阵列的联合频率-到达角二维谱估计方法,把经典的子空间方法推广到空时二维域并进行了改进.基本思路是估计空时噪声子空间和空时信号子空间,然后,利用两个空时子空间特征进行频率-到达角联合二维搜索.正常情况下可分辨的信源数远远超出阵元数目;在信号源宽带较大或信号源波长偏离阵列尺寸较远时,不会像经典方法一样出现大的偏差或估计信源角度范围受限;同时给出信号源的频率和到达角估计,更全面地反映了信号特征.

Joint Frequency-DOA Estimation Exploiting Virtual Tapped-delay-line Array

A kind of joint frequency-DOA spectrum estimation using virtual tapped-delay-line array is proposed, which generalizes the classical subspace algorithm to two-dimensional space-time domain. The proposed method has three advantages: firstly, increasing the freedom degrees of the corresponding array leading to an enhanced ability to identify much more emitters; secondly, almost free from estimation bias due to the divergence of signal wavelength from what the array size expresses; thirdly, estimating not only the DOAs but also the frequency domain characters of emitters. The obtained characteristic of emitters is more integral.