Accession Number : ADA188895

Title :   Removing Resonant Oscillation Signals from Swallow Float Data.

Descriptive Note : Technical memo.,

Corporate Author : SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA MARINE PHYSICAL LAB

Personal Author(s) : Culver, R L ; Hodgkiss, W S ; Edmonds, G L ; Anderson, V C

PDF Url : ADA188895

Report Date : May 1987

Pagination or Media Count : 107

Abstract : Self-contained, freely-drifting Swallow floats capable of recording very low frequency (VLF) ambient ocean noise are under development at the Marine Physical Laboratory, Scripps Institution of Oceanography, San Diego, California. The floats are ballasted to neutral buoyancy at a desired depth, whereupon they record the components of particle velocity, from which sound pressure levels may be derived. A high frequency acoustic mutual interrogation system is incorporated to provide float positions, permitting the combination of data from an array of floats. Consecutive records are averaged together to produce an estimate of the float's resonant oscillation signal. The resonant oscillation signal estimate is then correlated with each record to yield a weighting coefficient, and the weighted signal subtracted from the record. The method was applied to three of the four deployment floats, and it significantly attenuated resonant oscillation signals between 0.36 Hz and 6.1 Hz. Keywords: Swallow floats; Ambient ocean noise; Resonant oscillation.

Descriptors :   *AMBIENT NOISE, *ACOUSTIC RESONANCE, *UNDERWATER ACOUSTICS, ARRAYS, CALIFORNIA, COEFFICIENTS, DEPLOYMENT, ESTIMATES, FLOATS, LEVEL(QUANTITY), OCEANS, OSCILLATION, PARTICLES, RECORDING SYSTEMS, SIGNALS, SOUND PRESSURE, VELOCITY, VERY LOW FREQUENCY, WEIGHTING FUNCTIONS, ACOUSTIC DATA, ACOUSTIC ATTENUATION, RESONANCE

Subject Categories : Acoustics
      Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE