Inverse aperture synthesis in an acoustic dark field

A method is proposed for extracting the signal scattered by a moving acoust ic screen and for reconstructing the image of the scatterer. The results of the preliminary numerical calculations performed for a free space agree we ll with the results of the full-scale experiment in a lake. A good agreemen t between theory and experiment is achieved with an aperture synthesis by t he signal magnitude. The characteristic feature of the proposed method of a perture synthesis is the use of an extended acoustic array in the target tr acking mode of operation. This provides an additional condition for the det ermination of the parameters of the experiment, thus allowing one to determ ine two such parameters. (C) 2000 MAIK "Nauka/Interperiodica".