Direction Finding and Subspace Tracking of Coherent Acoustic Signals with Single Snapshot Smoothing Based on Vector Sensor Array
Jingshu Li · Dianzi xuebao · 2011
The problem of direction-of-arrival(DOA) estimation and subspace tracking of coherent signals is researched based on acoustic vector sensor array.According to the shift invariance property of the steering matrix of the linear array with the centre of symmetry,we propose a new particle-velocity-field algorithm(PVFSIA),with improved effective array aperture,which is based on single snapshot smoothing and available for the fast estimates of DOA in multi-path environment.Then a subspace tracking algorithm of coherent sources based on iteration is presented,which has higher tracking speed,and requires neither the eigen-decomposition into signal/noise subspace nor the inverse operation of matrix.Finally,the perturbation analysis of PVFSIA is introduced and the theoretical covariance formulas of fast DOA estimates are given.Simulation results are shown to verify the efficacy of the proposed algorithm.