Beam space weighted subspace fitting algorithm

The element space high resolution Weighted Subspace Fitting (WSF) algorithm was applied to the beam space. Beam space WSF algorithm uses beam outputs of array, which can be regarded as the outputs of an virtual array having the same number of elements, as the beam number to estimate target direction. In most of the underwater acoustic systems, the number of beams used for determining the direction of arrival is usually considerably less than the element number, so the computational load is decedent. Computer simulation results show that the beam space WSF algorithm retains the superior performance of the element space WSF algorithm when it is applied to the beam outputs of some practical acoustic-receiving array.