Fig. 1

The experiment collected tightly controlled acoustic scattering data, suitable for SAS reconstruction, from four target classes (a) in four environments (b). The targets were designed to have multiple discriminating features between classes, and the environments were designed to incrementally increase in complexity. An array of microphones and a loudspeaker were moved relative to the scene on a linear actuator (c), repeatedly transmitting a pulse and measuring the backscattered pressure (d). The resulting data were coherently reconstructed (e) into complex-valued imagery (f) that is a spatial representation of the estimated acoustic reflectivity of the scene.