Accession Number : ADA130397

Title :   A Characterization of Arctic Undersea Noise.

Descriptive Note : Technical rept. Sep 82-May 83,


Personal Author(s) : Veitch,James G ; Wilks,Allan R ; Schwartz,S C

PDF Url : ADA130397

Report Date : Jun 1983

Pagination or Media Count : 45

Abstract : Arctic undersea noise is investigated and partially characterized by a probability model suggested by exploration of a sample of such noise. The large size of the dataset makes this possible. The model is that of a mixed spectrum, with stationary Gaussian noise intermixed with random sinusoids, and occasional high intensity impulsive noise bursts, which are very short-lived. Due to the complex behavior of the random sinusoids, the noise cannot be considered as stationary in the time frame (10 minutes) investigated. The validity of the model is checked by testing model predictions against the actual data. In particular, this model makes some predictions about the type of spectrum observed, and these predictions are tested by a non-linear filtering of the period-program. A running median filter is used and is shown to asymptocally estimate the spectrum of the Gaussian noise. This filter seems to work fairly well on the data. (Author)

Descriptors :   *Acoustic recording systems, *Oceanographic data, *Ice, *Noise(Sound), *Underwater sound, *Arctic Ocean, Spectrum analysis, Time series analysis, Acoustics, Background noise, Gaussian noise, Fourier transformation, Moments, Signal processing, Mathematical prediction, Computations, Data bases, Statistical analysis, Charts, Graphs, Classification

Subject Categories : Snow, Ice and Permafrost
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE