MODELING WEAK FLUCTUATIONS OF UNDERSEA TELEMETRY SIGNALS

Amplitude and phase fluctuations of monochromatic acoustic signals in the ocean can be predicted by calculating statistical properties of wave equation perturbation solutions. For ranges less than a few kilometers in an active mixing region, or less than 15 km in the deep ocean, weak fluctuation theory can be used to model signal fluctuations in frequency and spatial frequency. Fluctuation predictions for transmission through realistic vector wavenumber spectra of oceanic sonic refractive index fluctuations are evaluated numerically and help define the ocean regions amenable to telemetry.