Beam Forming Algorithm Based On Symmetric Alpha-stable Distribution

Via modeling the reverberation noise by means of the symmetric alpha-stable(alpha S) distribution, and the second-order and above order moments of alpha S distribution are nonexistent, the fractional lower-order moment and zero-order moment concepts are put forward and the beam forming algorithms on account of them are proposed to instead of the beam forming algorithms on account of second-order moments. Taken full advantage of the feature of no second-order or above order existing in the symmetrical alpha-stable(S alpha S) process, the reverberation noise which possesses pulse characteristic can be strongly inhibited by these two algorithms, resulting in overcoming the shortage that the traditional beam former on the basis of second-order statistical moment was not suitable for reverberation noise. Compared with the traditional ones, more efficient algorithm performance and better robustness are showed out by the experiments. And the experimental results which based on sea -test data also show that these two algorithms are very efficient.