Bottom profile estimates using passive fathometer processing of ambient noise received by vertical nested array
- Title
- Bottom profile estimates using passive fathometer processing of ambient noise received by vertical nested array
- Author
- 김정훈
- Alternative Author(s)
- Kim, Junghun
- Advisor(s)
- Choi, Jee Woong
- Issue Date
- 2015-08
- Publisher
- 한양대학교
- Degree
- Doctor
- Abstract
- A passive fathometer technique utilizes surface-generated ambient noise received by a vertical line array as a sound source to estimate the depth of water-sediment interfaces and sub-bottom layers. This processing method uses the beamforming technique to analyze the vertical component of surface noise and its echo from the bottom. However, in all cases, uniform-spaced arrays were used for beamforming on the end-fire directions, although ambient noise was characterized as a broadband signal. The nested array processing is thus applied to the passive fathometer technique to overcome the drawbacks associated with use of uniform-spaced arrays and effectively cover broadband ambient noise.
Ambient noise is measured using a 24-channel, vertical nested line array consisting of four sub-arrays in shallow waters off the eastern coast of Korea. Passive fathometer processing is performed for each sub-array, and the results are combined to form a passive fathometer output for broadband ambient noise. Three types of beamforming techniques, including a conventional method and two adaptive methods, are used in the passive fathometer processing. The results are compared to the depths of the water-sediment interface as measured by an echo sounder.
- URI
- https://repository.hanyang.ac.kr/handle/20.500.11754/127742http://hanyang.dcollection.net/common/orgView/200000426946
- Appears in Collections:
- GRADUATE SCHOOL[S](대학원) > ENVIRONMENTAL MARINE SCIENCES(해양환경과학과) > Theses (Ph.D.)
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