Accession Number : AD0686476

Title :   SUPPORTING STUDIES FOR SONAR SYSTEM RANGE PREDICTIONS.

Descriptive Note : Final rept. 11 Jul 68-11Feb 69 on Phase 1,

Corporate Author : VITRO LABS WEST ORANGE N J WEST ORANGE LAB

Personal Author(s) : Davidson,R. O. ; Brown,G. A.

Report Date : 17 MAR 1969

Pagination or Media Count : 7

Abstract : During this phase of the contract work was performed in the following areas: (1) Signal excess level contours were computed for several sonar systems operating in various oceanographic areas. (2) Techniques were developed whereby geometrical spreading losses for unequal source/receiver sound velocities can be predicted on the basis of corrections to predictions made for equal source/receiver sound velocities. (3) A computer program for generating propagation loss under shallow water and varying bottom depth conditions, via a normal mode solution, was written. (4) A prediction system for providing average sound velocity to convergence zones in the Mediterranean Sea was developed. (5) The geometrical spreading loss prediction system developed under Contract N140(70024)76683B was modified to greatly increase its utility. (6) Studies were conducted to determine the feasibility of using correction factors on surface-to-surface data to obtain signal excess contours for below surface operations. (Author)

Descriptors :   (*SONAR, PERFORMANCE(ENGINEERING)), (*RANGES(FACILITIES), SONAR), TOWED SONAR, SONAR RECEIVERS, UNDERWATER SOUND, VELOCITY, SONAR PROJECTORS, COMPUTER PROGRAMMING, CORRECTIONS, SONAR SIGNALS, SOUND TRANSMISSION, FEASIBILITY STUDIES

Subject Categories : Test Facilities, Equipment and Methods
      Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE