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2021 Vol.40, Issue 1

Research Article

Measurement and simulation of high-frequency bistatic sea surface scattering channel in shallow water of Geoje bay

거제 내만해역에서의 고주파 양상태 해수면 음파산란 채널 측정 및 모의

Kang-Hoon Choi1
,
Yongbin Kim1
,
Sea-Moon Kim2
,
Jee Woong Choi3*
최 강훈1
,
김 용빈1
,
김 시문2
,
최 지웅3*
1한양대학교 해양융합과학과
2선박해양플랜트연구소
3한양대학교 ERICA 해양융합공학과
*Corresponding Author
31 January 2021. pp. 1-9
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Abstract

High-frequency bistatic sea surface scattering channels according to sea state were measured at an experimental site of Geoje bay in April 2020, and compared with predictions based on scattering theory. A linear frequency-modulated signal with a center frequency of 128 kHz and a bandwidth of 32 kHz was used for the acoustic measurements. Sea surface wavenumber spectrum was calculated from surface roughness data measured by a wave buoy, and bistatic scattering cross-section of Small Slope Approximation (SSA) based on the wavenumber spectrum was estimated. In addition, scattering from near-surface bubbles using wind speed measured during experiments was considered. Surface scattering channel intensity impulse responses were simulated using the scattering cross-section and the simulation results were compared and analyzed with the field data.

Keywords
High-frequency bistatic sea surface scattering
Sea surface roughness
Sea surface wavenumber spectrum
Sea surface bubble scattering

해수면 상태에 따른 고주파 양상태 해수면 음파산란 채널 측정 실험은 2020년 4월 거제 내만해역에서 수행되었으며 산란이론을 기반으로 한 모의결과와 비교하였다. 신호는 중심주파수 128 kHz, 대역폭 32 kHz의 선형 주파수 변조 신호를 이용하였다. 파고부이를 통해 측정된 해수면 거칠기로부터 해수면 파수 스펙트럼을 계산하였고 산란이론인 Small Slope Approximation(SSA)에 적용하여 해수면 거칠기에 의한 산란강도를 추정하였다. 또한 실험 당시 풍속을 이용하여 해수면 부근 공기방울층 음파산란을 고려하여 산란강도를 계산하였다. 모의된 산란강도를 이용하여 해수면 산란 채널 세기 임펄스 응답을 모의하였고, 해수면 파수 스펙트럼과 공기방울층 산란에 따른 모의결과를 측정치와 비교, 분석하였다.

키워드
고주파 양상태 해수면 음파산란
해수면 거칠기
해수면 파수 스펙트럼
공기방울층 산란
References
1
J. W. Choi, J. Na, and Y. N. Na, "Measurements of bistatic sea surface scattering signals" (in Korean), J. Acoust. Soc. Kr. 20, 81-86 (2001).
2
P. H. Dahl, "On bistatic sea surface scattering: Field measurements and modeling," J. Acoust. Soc. Am. 105, 2155-2169 (1999). 10.1121/1.426820
3
P. H. Dahl, "High-frequency forward scattering from the sea surface: The characteristic scales of time and angle spreading," IEEE J. Ocean. Eng. 26, 141-151 (2001). 10.1109/48.917951
4
A. S. Zapevalov, "Evaluation of the scattering coefficient for high-frequency sound scattered from the sea surface," Acoustical Physics. 53, 603-610 (2007). 10.1134/S1063771007050119
5
E. I. Thorsos, "Acoustic scattering from a ' Pierson- Moskowitz ' sea surface," J. Acoust. Soc. Am. 88, 335-349 (1990). 10.1121/1.399909
6
P. H. Dahl, "On the spatial coherence and angular spreading of sound forward scattered from the sea surface: Measurements and interpretive model," J. Acoust. Soc. Am. 100, 748-758 (1996). 10.1121/1.416237
7
A. G. Voronovich, Wave Scattering from Rough Surfaces (Springer-Verlag, New York, 2013), pp. 148-163.
8
P. Beckmann and A. Spizzichino, The Scattering of Electromagnetic Waves from Rough Surfaces (Pergamon, Oxford, 1963), pp. 17-33.
9
A. Ishimaru, Wave Propagation and Scattering in Random Media Vol. II (Academic, New York, 1978), pp. 463-492. 10.1016/B978-0-12-374702-0.50014-5
10
J. W. Choi, J. Na, K. J. Park, K.-S. Yoon, J.-S. Park, and Y. N. Na, "Measurements of high-frequency sea surface backscattering signals" (in Korean), J. Acoust. Soc. Kr. 21, 421-429 (2002). 10.12671/jksf.2002.15.1.21
11
J. W. Choi and P. H. Dahl, "Measurement and simulation of the channel intensity impulse response for a site in the East China Sea," J. Acoust. Soc. Am. 119, 2677- 2685 (2006). 10.1121/1.2189449
12
W. J. Plant, "The ocean wave height variance spectrum: Wavenumber peak versus frequency peak," J phys. Oceanogr. 39, 2382-2383 (2009). 10.1175/2009JPO4268.1
13
M. L. Banner, "Equilibrium spectra of wind waves," J. Phys. Oceanogr. 20, 966-984 (1990). 10.1175/1520-0485(1990)020<0966:ESOWW>2.0.CO;2
Information
  • Publisher :The Acoustical Society of Korea
  • Publisher(Ko) :한국음향학회
  • Journal Title :The Journal of the Acoustical Society of Korea
  • Journal Title(Ko) :한국음향학회지
  • Volume : 40
  • No :1
  • Pages :1-9
  • Received Date : 2020-12-23
  • Accepted Date : 2021-01-05
  • DOI :https://doi.org/10.7776/ASK.2021.40.1.001
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