旋转因子无畸变的声矢量阵矩阵预滤波设计

Design of matrix pre-filter with a distortionless rotating factor for acoustic vector sensor array

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.

To improve the performance of estimation of signal parameters via rotational invariance techniques （ESPRIT） algorithm using an acoustic vector sensor array, the matrix spatial pre-filter was applied to the ESPRIT estimation. A method to design the matrix spatial pre-filter with distortionless rotating factor was proposed. Through isolating the rotating factor from the acoustic vector sensor array manifold, the matrix was designed only depending on the remanent array manifold to reach suppressing the noise and interference in unwanted directions and receiving the signals in desired directions with minimal distortion. Simulation results show that the noise and interference can be efficiently suppressed. Due to the characteristic of the distortionless rotating factor, the algorithm can perform with high resolution even if the array manifold of filter passband is serious distorted.