Resolving the Directional Ambiguities of a Line Array of Hydrophones.
Albert H. Nuttall · Defense Technical Information Center (DTIC) · 1972
A technique for estimating the angular power distribution of the background noise field by means of a line array of hydrophones is presented. The inherent ambiguities of the line array response are resolved by making measurements at more than one orientation of the array and by combining all the measurements to yield an estimate with least-squares error. The necessary data processing to be applied to actual measurements of beam output powers is summarized in a single matrix that can be precomputed for a given array and stored. Examples of the technique, extensions to use of a priori estimates of the power distribution, and weighted errors are included. (Author)