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为了提高基于声矢量阵的旋转不变参数估计(ESPRIT)算法的远场目标方位估计能力,提出了一种旋转因子无畸变的矩阵预滤波设计方法.通过将用于方位估计的旋转因子从声矢量阵的阵列流形中分离出来,仅对余下的阵列流形进行预滤波设计,达到抑制阻带扇面干扰和噪声,并让通带扇面的信号尽量无失真输出的目的.仿真结果表明:本算法对通带外的噪声和干扰具有良好的抑制效果,并且能够在滤波器通带流形失真的情况下,保证子阵间的旋转因子不发生畸变,且估计的结果无偏、有效.
In order to improve the ability of the ESPRIT algorithm to estimate the azimuth of the far-field target, a method of pre-filtering the matrix with undistorted twiddle factor is proposed. By using the twiddle factor for azimuth estimation, Vector array array manifold, and only pre-filter the remaining array manifolds to achieve the goal of suppressing the interference and noise of the stop-band sector and minimizing the output of the signal of the pass-band sector.The simulation results show that The algorithm has a good effect of suppressing the noise and interference outside the passband, and can ensure that the rotation factor between the subarrays will not distort if the passband of the filter is distorted, and the estimation result is unbiased and effective.