Speaker
Description
We study the problem of calculating the acoustic field scattered by a moving rigid object in response to a moving emitter in three-dimensional space. The object is assumed to be locally planar relative to the wavelength, enabling the use of the physical optics approximation to model wave scattering. However, due to the motion of both the emitter and the object, conventional frequency-domain physical optics formulations are not applicable. Instead, we develop a time-domain variant of this approach that explicitly accounts for their motion. The analysis focuses on the near-field regime, where the combined motion induces a complex wave field that cannot be described by a simple Doppler effect. The proposed algorithm accommodates arbitrary emitter trajectories, arbitrary translational motion of the object, high velocities relative to the speed of sound, and emission of arbitrarily shaped signals.