LARGE-ARRAY SIGNAL AND NOISE ANALYSIS. ANALYSIS OF LONG-PERIOD NOISE
Abstract
This report presents the results of the analysis of nine long-period noise samples recorded at the Montana LASA between 12 November 1966 and 7 February 1967. This analysis was undertaken to describe the salient characteristics of the long-period noise. Particular attention was given to spectral analysis, coherence among channels, spatial organization, identification of modal content, and identification of noise sources. Results of the analysis of the long-period noise indicate that the noise generally appears to be related to storms and is probably the result of wave activity in the North Atlantic and North Pacific. The noise is quite time-variable and is highly coherent. The coherent-noise peaks above 0.05 cps appear to be predominantly (at least 90 percent) surface-mode energy. There is some evidence that a portion of the horizontal energy is Love-wave energy. The noise below 0.05 cps does not appear to behave as propagating plane waves. Power spectra of similar components are generally space-stationary. The horizontal components are considerably noisier than the vertical in the range f < 0.05 cps and 0.1 < f < 0.2 cps.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 18, 1967
- Accession Number
- AD0822716
Entities
People
- Frank H. Binder
Organizations
- Texas Instruments