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Green's function extraction by crosscorrelation and multidimensional deconvolution for outdoor sound propagation
Max F Denis1, Sandra L Collier1, John M Noble1
1U.S. Army Research Laboratory, 2800 Powder Mill Road, Adelphi, Maryland 20783-1123, USA max.f.denis.ctr@mail.mil, sandra.l.collier4.civ@mail.mil, john.m.noble.civ@mail.mil, william.c.alberts4.civ@mail.mil, david.a.ligon.civ@mail.mil, leng.k.sim.civ@mail.mil, deryck.d.james.civ@mail.mil, christian.g.reiff.civ@mail.mil.
Abstract:
In this work, the Green's function is estimated from outdoor measurements of controlled-sources. Crosscorrelation and multidimensional deconvolution have successfully been employed for Green's function retrieval. Crosscorrelation assumes a lossless medium and equipartitioned wavefield; when these assumptions are not satisfied it may result in a Green's function smeared with the source point-spread function. Multidimensional deconvolution removes the point-spread function from the retrieved Green's function. Both methods are employed to estimate the Green's function between two array stations for a single and multiple controlled-sources. The results demonstrate that the source-to-center radius has a negligible effect on the retrieved Green's function, if the source-to-center radius is larger than the distance between the two array stations.