Abstract: Paper describes the efficient method of gaining information from beamformer based on band subsampling technique. In active sonar systems, where centre (carrier) frequency is known (neglecting the Doppler shift), it is feasible to use the subsampling techniques, widely used elsewhere. The subsampling techniques can be used for narrow band signals. One of the advantages of this method lays in the use of noiseless heterodyne in mixer circuit, which provides errorless signal shifting to zero frequency. The use of subsampling provides good opportunity for decreasing the amount of digital processing, hardware components and followed by capital expenditure consumed during fabrication of sonars systems. lt also allows increasing the spatial resolution of sonar by increasing the number of preformed beams in the sonar array.