AUTOMATED PREPARATION OF SEABED DATA FOR 3-D SONAR MODELLING, USING GEOGRAPHIC INFORMATION SYSTEM TECHNOLOGY

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Authors
  1. Holm, E.W.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);Eric (W) Holm, Halifax NS (CAN)
Abstract
The majority of monostatic sonar performance prediction models are two dimensional. Many of these assume the environment is horizontally stratified (i.e. range-independent). Significant effort at DREA and elsewhere is being placed on the development of three-dimensional acoustic models. By assuming that the effects of horizontal refraction are negligible, 2D (range-dependent) models may be extended to the 3D environment by considering a number of radials from the sonar location. A major difficulty of this approach is the manipulation of the spatial data in order to supply the 2D model with input. We have developed a program to automate the preparation of seabed data, building on the libraries of the GRASS GIS system. This program subsumes all the functionality of the "d.radials" software reported on previously, with a new GUI interface, and facilities to automatically generate a selection of radials. In addition, it integrates sound velocity profile data prepared through a GRASS-Oracle query and conversion tool. Further, the program will automatically generate breakpoints through the preparation of an environmental similarity map. The user may inspect and edit the generated radials and breakpoints. The program outputs descriptions of the radials, a set of PMODES input files for the MONOGO reverberation model. Though the interference is largely self-explanatory, the program includes hypertext help documentation. TRUNCATED
Keywords
Graphical User Interface (GUI)
Report Number
DREA-CR-95-412 — Contract Report
Date of publication
01 Apr 1995
Number of Pages
43
DSTKIM No
97-02659
CANDIS No
502875
Format(s):
Hardcopy;Document Image stored on Optical Disk

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