  In this paper, a new multi-source wideband direction of arrival (MSW-DOA)
estimation method is proposed for the signal with non-uniform distribution
using the sub-array of uniform linear array. Different from conventional
methods, based on the free far-field model, the proposed method mainly makes
two contributions. One is that the sub-array decomposition is adopted to
improve the accuracy of MSW-DOA estimation by minimizing the weighted error,
and the other one is that the frequency focusing procedure is optimized
according to the presence probability of sound sources for reducing the
influence of the sub-bands with low signal to noise ratio (SNR). Simulation
results show that the proposed method can effectively improve the performance
of wideband DOA estimation in the case of multiple sound sources.
