利用对称阵实现宽带线性调频信号DoA估计

提出了一种利用对称阵实现宽带线性调频(LFM)信号DoA估计的新方法。该方法通过计算对称阵元偶之间的互Wigner Ville分布,建立时频域的阵列信号模型,并用修正的总体最小二乘 相干信号子空间方法(MTLS CSM)获得DoA估计。该方法由于充分利用了Wigner Ville分布的时频滤波特性,因此能有效实现多个线性调频信号的DoA估计,在低信噪比情况下仍有较高的估计精度。同时该方法还具有DoA不受扇区限制,计算简单等优点。计算机仿真证实了方法的有效性。

DoA estimation of wide-band LFM sources using symmetric sensor array

A new method for DoA (direction-of-arrival)estimation of wide-band LFM sources using antenna array with symmetric geometry is presented. The array model in time-frequency domain is constructed by computing the cross Wigner-Ville distributions(XWVD) of the symmetric sensor pairs, and MTLS-CSM is used to estimate the DoA of the sources. Due to the time-frequency filtering characteristic of WVD, the proposed algorithm can process multiple LFM sources with different time-frequency signatures. DoA estimation with high accuracy is available even under low SNR circumstances. In addition, the algorithm is free of sector limitation and has lower computational complexity compared with the conventional CSM. Numerical simulations are provided to demonstrate the effectiveness of the proposed method.