ASA 127th Meeting M.I.T. 1994 June 6-10

1aSA4. Modeling of echoes from extended targets in shallow water.

T. Baus

W. Chang

R. Deavenport

Naval Undersea Warfare Ctr., Code 3111, New London, CT 06320

Echoes are generated, and compared, for extended targets in a shallow water environment using the total target--medium broadband frequency response function and the frequency representation of the transmitted signal. The two-way medium response is calculated using the generic sonar model (GSM) environmental model. The target frequency response is found using a model of distributed targets and elastic spheres. The combination of the target and medium frequency responses gives the full frequency response, or form function, for the target--medium system. The product of the total form function with the frequency spectrum of the incident signal is computed and an inverse FFT is performed to predict the received signal, or echo, from the object. [This work was sponsored by the Office of Naval Research---Technology Directorate.]