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The world's oceans contain an ambient noise field. Seismic
disturbances, surface shipping, and marine mammals are sources that, in
different frequency ranges, contribte to this field. We wish to consider
how this ambient noise might be used to detect large moving objects, e.g.,
submarines located below the ocean surface. Assuming that a submarine
makes no intrinsic noise, develop a method for detecting the presence of a
moving submarine, its speed, its size, and its direction of travel, using
only information obtained by measuring changes to the ambient noise field.
Begin with noise at one fixed frequency and amplitude. |
