Studies on a 120 degrees segmented circular array for multi-beam multi-frequency bathymetric application

Abstract

A theoretical analysis of the vertical for field patterns and input impedances, as well as excitation velocities of a 120 degrees segmented circular array of 40 groups of four elements each is performed. The narrowest beam widths at normal incidence and other steering angles suppoet the use of such an array for bathymetric applications. The half-power beam widths at different steering angles are found to be comparable with the computed values of the half-power beam widths of a linear array of equivalent size. The present study of the mutual interaction effect between the array elements reveals that the interaction effects are relatively less for a 120 degrees segmented circular array. Furthermore, the 120 degrees segmented circular array geometry for multi-frequency use is found suitable after carrying out a study at different operating wavelengths that are useful for underwater bathymetric applications