GENETIC ALGORITHM INVERSION OF THE 1997 GEOACOUSTIC INVERSION WORKSHOP TEST CASE DATA

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Authors
  1. Heard, G.J.
  2. Hannay, D.
  3. Carr, S.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);Jasco Research Ltd, Brentwood Bay BC (CAN)
Abstract
An analysis of the 1997 Geoacoustic Inversion Workshop test case data was carried out by Jasco Research Ltd. under the auspices of a research contract let by the Defence Research Establishment Atlantic. The analysis of the test cases served to benchmark the performance of a Genetic Algorithm (GA) inversion code written by Jasco Research called SAGA_INV. The inversion program made use of Westwood's ORCA propagation model, FORTRAN subroutines, and Interactive Data Language (IDL) by Research Systems Incorporated. The code is designed to run on UNIX (or Linux) workstations, but should be relatively simple to port to other operating systems. SAGA_INV is capable of performing inversions with either Simulated Annealing (SA) or GA optimisation schemes; however, only the GA portion of the code has been benchmarked with the workshop test cases at the present time. Not all of the workshop test cases were processed: this study was concerned only with the CAL, SD, SO, AT, and WA data sets. The CAL data was processed suing three different cost functions: (i) standard Bartlett processor, (ii) a broadband coherent processor, and (iii) a transmission loss mismatch function. These processors were applied to three frequency bands: (i) 76 frequencies between 25 and 100 Hz, (ii) 9 frequencies between 28 and 36 Hz, and (iii) 13 frequencies between 44 and 56 respectively. TRUNCATED
Keywords
Genetic algorithms;Geoacoustic parameter inversion
Date of publication
01 Nov 1997
Number of Pages
12
Reprinted from
J of Computational Acosutics
DSTKIM No
98-00046
CANDIS No
506553
Format(s):
Hardcopy;Document Image stored on Optical Disk

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