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 Inversion Workshop we have applied Matched-Field Inversion to determine the geoacoustic and geometric (source location, water depth) parameters. A genetic algorithm has been applied for performing the optimization, whereas the replica fields have been calculated using a standard normal-mode model. The energy function to be optimized is based on the incoherent multi-frequency Bartlett processor. We have used the data sets provided at a few frequencies 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.