Comparative analysis of tomographic methods for the observation of inhomogeneities in a shallow sea

Several procedures are proposed that allow one to determine the parameters of motion of an inhomogeneity crossing the propagation path between a source of an acoustic signal and a receiving array without the use of any detailed description of the medium (the sound velocity profile, the bottom parameters, etc.). The potentialities and characteristic features of the proposed approach are analyzed within the framework of a one-dimensional waveguide propagation model. A comparative analysis of the reliability of inhomogeneity observations is performed on the basis of a representative experimental data set obtained from a lake experiment for the cases of using the procedures of coherent space-time processing of signals in antenna arrays and the procedures with a spatial and temporal incoherent accumulation.