This paper proposes a new method for estimating the direction-of-arrival (DOA) of wideband signal

which employs particle filters to track array manifold at different frequency bands.Compared with the coherent signal-subspace method (CSM)

the proposed method utilizes the current observed data and does not require the estimated covariance matrix

thus it performs better while considering a small sample set.In the meantime

this method does not require the preliminary DOA estimates.Moreover

the proposed method can localize completely correlated sources as it is based on the idea of maximum likelihood.Simulation results show that the performance of the propose method is better than CSM when the sample set is small

the signal to noise ratio (SNR) is low and the signal sources are correlated.