Accession Number : AD0623360

Title :   OPTIMUM ARRAY GAIN FOR DIRECTIONAL NOISE.

Descriptive Note : Research rept.,

Corporate Author : NAVY UNDERWATER SOUND LAB NEW LONDON CONN

Personal Author(s) : Becker,Clair J. ; Cron,Benjamin F.

Report Date : 05 OCT 1965

Pagination or Media Count : 39

Abstract : From the definition of array gain, the gain of a linear array of point receivers is given in terms of spatial correlation of the noise. The theoretical methods of obtaining spatial correlation for directional noise are reviewed. An experimental verification of the theory is also presented. Under consideration is an 8-element vertical array of equispaced elements perpendicular to the surface of the ocean. The gain is computed for the cases of a single frequency and of narrow-band and wide-band frequencies. The effects of both broadside and endfire steering are analyzed. The gain is computed as a function of the spacing between elements for the case of uniform shading. For each configuration, the gain for optimum shading is obtained. For the case of isotropic noise and narrow-band frequency, the gain is on the order of 10 log 8, or about 9 db. For the case of directional noise, narrow-band frequency (750-850 cps), broadside steering, and uniform shading, the gain is on the order of 17 db for optimum spacing. An additional 2 db is obtained for the case of optimum shading at the optimum spacing configuration. (Author)

Descriptors :   (*SONAR EQUIPMENT, GAIN), (*GAIN, OPTIMIZATION), ACOUSTIC EQUIPMENT, NOISE, NOISE ANALYZERS, SONAR RECEIVERS

Distribution Statement : APPROVED FOR PUBLIC RELEASE