By Topic

Analysis of Attenuation Measurements in Ocean Sediments Using Normal Incidence Chirp Sonar

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

3 Author(s)
Yao-Ting Tseng ; Inst. of Oceanogr., Nat. Taiwan Univ., Taipei, Taiwan ; Jian-Jiun Ding ; Char-Shine Liu

An analysis of chirp sonar signals backscattered from ocean sediments is presented in this paper to estimate sound attenuation in ocean sediments. The theory of applying a matched filter to linear frequency modulation chirp signals for generating time compressed pulses (CPs) is described and implemented. After the matched filter technique was applied, the signal-to-noise ratio (SNR) of the CP was enhanced. However, a smearing effect resulting from the convolution operation diminished the advantage of the improved SNR. The chirp signal processing algorithm is described and applied to a sample data set collected from an area with a variety of different sediments offshore northeastern Taiwan. For the exploration of signal features, time-frequency analysis is employed to reveal the characteristics of chirp signals presented in the joint time-frequency domain. Based on the spectral ratio method, ocean sediment attenuation properties are compared to those obtained from core samples analyzed in the laboratory. The observed attenuation coefficient was lower than those of some of the previous studies, but it was still within the reported data range. Factors that could contribute to the uncertainty are discussed.

Published in:

Oceanic Engineering, IEEE Journal of  (Volume:37 ,  Issue: 3 )