Synthetic aperture geoacoustic inversion in the presence of radial velocity and acceleration dynamics

A low signal to noise ratio (SNR), single-receiver, broadband, frequency coherent matched-field inversion procedure that exploits coherently repeated transmissions to improve estimation of the geoacoustic parameters recently has been proposed. The long observation time creates a synthetic aperture due to relative source-receiver motion. However, the inversion performance degrades when source/receiver acceleration exists. This paper extends the broadband synthetic aperture geoacoustic inversion to approach cases where the source/receiver radial velocity changes. When this situation exists, it is demonstrated that modeling acceleration is critical for correct inversion. This is done in simulation and real data analysis of low SNR, 100-900 Hz LFM pulses from the Shallow Water 2006 experiment.