Multipath in the Three-Dimensional Underwater Array.
Abstract
A planar array of widely dispersed hydrophones deployed in a horizontal plane several hundred meters below the surface of the sea was analyzed. Because of the dispersive nature of the underwater medium, signal energy approaches the array from a source along a number of refracting paths. This results in multipath interference and a possible consequent loss of output. Ray arrivals from the source typically fall into a range of vertical angles at the receiver which are + or - 10 relative to the horizontal. The vertical beamwidth of a planar antenna is large enough to accept all rays in such a range, hence it is multipath sensitive. A three-dimensional array is capable of a sharper vertical focus and will be less sensitive to the kind of multipath typical in this application. In fact, by suitably processing the array output there is the possibility that the multipath arrivals can be separately received and then combined in phase to achieve an 'angle of arrival diversity' system. Such systems have been proposed for tropospheric scatter receivers.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1979
- Accession Number
- ADA100707
Entities
People
- Fred Haber
Organizations
- Moore School of Electrical Engineering