基于虚拟旋转不变技术的宽带信号二维到达角估计

在相关信号子空间方法的基础上,本文提出了一种阵列宽带信号二维角度的估计方法。该方法首先利用虚拟互相关计算方法得到阵列输出的协方差矩阵,并构造出两个子阵(实际子阵和虚拟子阵);然后采用投影算子来形成聚焦矩阵,最后对聚焦后的协方差矩阵采用ESPRIT方法估计出宽带信号的二维到达角。这种方法能抑制非高斯噪声对算法的影响,并能扩展阵列孔径,且不需要进行角度预估计;估计出的二维角度能自动配对,提高了算法的实现速度。计算机仿真试验证实了该算法的有效性。

Two-dimensional direction of arrival estimation of wideband signals based on virtual rotational invariance techniques

Based on the coherent signal-subspace method(CSM),a two-dimensional DOA estimating method of wideband signals has been proposed.At first,used virtual cross-correlation computation(VC~3)to form array output covariance matrix,and constructed two sub-arrays(true and virtual sub-array);then used the projector operator to form focusing matrix,and at final used ESPRIT method to es- timate the two-dimensional broadband signal arrival angle.This method can inhibit non-Gaussian noise impact on the algorithm,and can be extended array aperture,and does not require pre-angle estimates.The two-dimensional angles can be matched automatically.This can improve the speed of the algorithm.Computer simulation confirms the methods availability.