Accession Number:

ADC014132

Title:

Merchant Ship Signatures

Descriptive Note:

Technical rept.

Corporate Author:

TEXAS UNIV AT AUSTIN APPLIED RESEARCH LABS

Report Date:

1977-08-18

Pagination or Media Count:

94.0

Abstract:

Ship signatures in the form of 110 octave band time series and narrowband spectra 0.15 Hz resolution over the frequency range 10 to 500 Hz are presented. These signatures, detected on a near-bottom receiver in the mid- northeast Pacific Ocean during the CHURCH OPAL exercise, are characterized by greater than 20 dB signal-to-noise ratios over the entire frequency band of 10 to 500 Hz for all merchant ships that approached the receiver site to within 10 nm. The high signal-to-noise ratios resulted from very low noise levels observed in this ocean area. Estimates of source level based on reported ship positions and theoretical propagation loss are 10 dB greater than expected.

Subject Categories:

  • Marine Engineering
  • Acoustic Detection and Detectors
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE