The wide-band coherent signal-subspace processing based on propagator method

The narrow band propagator method is introduced to the wideband signal-subspace processing in the direction finding problem.A new technique is presented to compute the focusing matrices.It needs no direction pre-estimationor matrix decomposition,so the focusing matrices are insensitive to the signals'directions and the computation is simple.Then,the propagator method is extended to the focused covariance matrix to find the directions of the sources.Thewhole estimation process avoids the rather expensive matrix decomposition.The results of simulations support theeffectiveness of the new method.