Detection Performance of Horizontal Linear Hydrophone Arrays in Shallow Water

摘要

A comprehensive model study of the use of horizontal hydrophone arrays in shallow water is presented. Existing knowledge of signal-processing techniques is applied to a shallow-water sound-propagation model in order to determine the influence of shallow-water conditions on the design of receiver structures. In particular, the spatial part of the problem of the detection of targets in the presence of directive noise sources is of interest. Most literature on array processing simplifies receiver structures by making simple assumptions about the medium (e.g. coherent plane waves). These approximations may be valid to some extent for sources in deep water and radar; in shallow water, however, one is faced with the problem of target detection in a waveguide. This investigation was therefore made in order to find simple receiver structures when the characteristics of the medium are taken into account. A great variety of array processors (quadratic, linear, adaptive, nonadaptive, optimum, suboptimum) is discussed. In addition, some system limitations (receiver bandwidth, distortion of the array shape, inclusion of the target in the noise estimation in passive systems) are considered. (Author)