| Popis: |
Using the SDSC/CRAY and the parabolic equation, pulse propagation was simulated in the ocean sound channel. Pulses with 200 frequencies between 10 and 50 Hz were synthesized, giving a pulse width of approximately 25 ms, and a pulse repetition time of 5 s. The wave fronts created by this technique have a simple and intuitive character, unlike the fields for single frequencies. Pictures of wave fronts out to 1000 km, and possibly a movie, will be shown. Wave front reconstruction by means of a much faster calculation in terms of ray theory will be demonstrated. The effects of internal waves on the wave fronts will be described in terms of wave front corrugations, and the use of impulse measurements over vertical arrays to measure the properties of the internal‐wave field will be discussed. [Work supported by ONR, Code 1125OA.] |
