各向同性噪声场中单矢量传感器虚源消除MUSIC测向方法

MUSIC Direction of arrival estimation method with virtual source elimination for single vector sensor under isotropic ambient noise background

摘要: 针对各向同性噪声场中,单矢量水声传感器声压通道和振速通道的噪声功率不一致性造成MUSIC测向方法性能急剧下降的问题,提出了一种增秩MUSIC测向方法和一种幅度加权MUSIC测向方法。增秩MUSIC测向方法通过增加信号子空间维度消除虚源的影响,在单目标情况和低信噪比时可获得高精度方位估计结果,其性能接近克拉美洛界限(CRB),但它不能分辨双目标;幅度加权MUSIC测向方法通过对接收信号幅度加权消除了虚源,并且能分辨双目标。

Abstract: In the scenario of isotropic ambient noise,the inequality between the noise powers of the pressure and velocity channels of a single vector acoustic sensor dramatically degrades the performance of the MUSIC method.In order to solve this problem,an increased-rank MUSIC method and a weighted-amplitude MUSIC method are presented.The increased-rank MUSIC method augments the dimension of the signal subspace to eliminate the effect of the virtual source.It gains the highest estimation accuracy in the case of one source and a low Signal-to-Noise Ratio(SNR) and its performance approaches to the CRB.However,it fails in the case of two sources.The weighted-amplitude MUSIC method weights the amplitude of the received signal to eliminate the virtual source and it can identify two sources.