English

DTIC AD0916280: Navy Interim Surface Ship Model (NISSM) II

A computer program, Navy Interim Surface ship Model (NISSM) II, has been developed to predict the performance of active sonar systems. Thereby acoustic ray trajectories, propagation-loss curves, boundary and volume reverberation, signal-to-noise ratios, and the probability of detection are determined using continuous-gradient ray-tracing techniques. Caustic, shadow zone, and surface-duct corrections modify the classical ray theory. The major limitations of the model are that the ocean bottom must be horizontal and the velocity of sound may not vary with range.

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