Multi-frequency matched-field inversion of benchmark data using a genetic algorithm

For a selected number of shallow water test cases of the 1997 Geoacoustic I nversion Workshop we have applied Matched-Field Inversion to determine the geoacoustic and geometric (source location, water depth) parameters. A gene tic algorithm has been applied for performing the optimization, whereas the replica fields have been calculated using a standard normal-mode model. Th e energy function to be optimized is based on the incoherent multi-frequenc y Bartlett processor. We have used the data sets provided at a few frequenc ies in the band 25-500 Hz for a vertical line array positioned at 5 km from the source. A comparison between the inverted and true parameter values is made.