EurOCEAN 2000 - Vlaams Instituut voor de Zee

THE TOMOLAB SOFTWARE PACKAGE
TOMOLAB is an integrated software environment, developed in MATLAB, providing easy-to
use capability for the design, processing and analysis of ocean acoustic tomography
experiments. It contains toolboxes for experiment and instrument description, ocean data
analysis, forward and inversion-related acoustic calculations, tomography data pre-processing,
travel-time estimation, peak identification and slice inversion (see Fig. 1). The scope of the
various toolboxes is briefly described below.
ƒ The experiment and instrument setup toolboxes are used to define/describe the
geographical and geometrical parameters and data of tomography experiments as well as
the parameters and data referring to the moored instruments and their components
(controllers, clocks, transducers, receiving arrays, navigators).
ƒ The ocean data toolbox handles historical and experiment-specific oceanographic
information (data bases) and provides sound-speed and bathymetry sections, mean
parameters for temperature and salinity, sound-speed EOF modes and their variances, as
well as sound-speed to temperature conversion relations to be used for tomographic
inversions.
ƒ The acoustic toolbox is used to perform forward and inversion-related acoustic calculations
for a particular experiment and using ocean data defined/provided by the previous
toolboxes. The forward calculations refer to arrival patterns, arrival times and related
quantities using ray-trace and normal-mode codes. The inversion-related calculations refer
in addition to the derivatives of arrival times with respect to sound-speed modes
(influence/observation matrices) for a set of background states.
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EXPERIMENT
SETUP
INSTRUMENT
SETUP
TOOLBOX
INSTRUMENT
DATABASE
RAW
TOMOGRAPHY
DATA
DATA
PRE-PROCESSING
TOOLBOX
ESTIMATION–
IDENTIFICATION
TOOLBOX
INVERSION
TOOLBOX
INVERSION
RESULTS
OCEAN
DATABASE
OCEAN DATA
TOOLBOX
ACOUSTIC
TOOLBOX
FIG. 1. A SCHEMATIC DIAGRAM OF THE TOMOLAB STRUCTURE