Ambient noise spectral properties in the north area of Xisha
-
摘要: 主动声纳和被动声纳系统的探测范围与海洋环境噪声密切相关,因此它在声纳性能预报系统中非常重要.在声纳系统的不确定分析中,需要知道海洋环境噪声的统计特性,而这只能通过环境噪声测量并进行信号分析处理得到.16通道海洋环境噪声测量系统每小时测量两分钟噪声信号,数据处理结果表明,噪声谱级在海水中部基本不随接收深度发生变化.文章还给出了噪声谱级(1h、6h和12h平均)与风速的互相关系数,结果表明,在高频段噪声谱级与风速具有很好的相关性,且噪声谱级与高风速的相关性好于与低风速的相关性.Abstract: Ambient noise is very important in the prediction system of a sonar performance, because it determines the detection ranges always in a passive sonar and usually in an active sonar. In the uncertainty issue for the sonar performance, it is necessary to know this factor's statistical characteristics that are only obtained by data processing from the underwater ambient noise measurements. Broad-band ambient noise signals from 16 hydrophones were amplified and recorded for 2 min every 1 h. The results show that the ambient noise is essentially depth independent. The cross correlation of the ambient noise levels (1, 6 and 12 h average) with a wind speed is presented. It was found that the correlation is excellent on the upper frequency band and the noise levels correlate better with high wind speed than with low wind speed.
-
Key words:
- ambient noise /
- cross correlation /
- wind speed
-
Barclay D R. 2011. Depth profiling ambient noise in the deep ocean [dissertation]. San Diego: University of California Crouch W W, Burt P J. 1972. The logarithmic dependence of surface- generated ambient-sea-noise spectrum level on wind speed. J Acoust Soc Am, 51(3B): 1066-1072 Gaul R D, Knobles D P, Shooter J A, et al. 2007. Ambient noise analysis of deep ocean measurements in the Northeast Pacific. IEEE Journal of Oceanic Engineering, 32(2): 497-512 Kuperman W A, Ferla M C. 1985. A shallow water experiment to determine the source spectrum level of wind generated noise. J Acoust Soc Am, 77(6): 2067-2073 Knudsen V O, Alford R S, Emling J W. 1948. Under water ambien noise. Mar Res, 7: 410-429 Marshall S W. 2005. Depth dependence of ambient noise. IEEE Journal of Oceanic Engineering, 30(2): 275-281 McDonald M A, Hildebrand J A, Wiggins S M, et al. 2008. A 50 year comparison of ambient ocean noise near San Clemente Island: A bathymetrically complex coastal region off Southern California. J Acoust Soc Am, 124(4): 1985-1992 Morris G B. 1978. Depth dependence of ambient noise in the northeastern Pacific Ocean. J Acoust Soc Am, 64(2): 581-590 Perrone A J. 1970. Ambient noise spectrum levels as a function of water depth. J Acoust Soc Am, 48: 362-370 Piggott C L. 1964. Ambient sea noise at low frequencies in shallow water of the Scotian Shelf. J Acoust Soc Am, 36(11): 2152-2163 Walkinshaw H M. 2005. Measurements of ambient noise spectra in the South Norwegian Sea. IEEE Journal of Oceanic Engineering, 30(2): 262-266 Wei R C, Chen C F, Newhall A E, et al. 2004. A preliminary examination of the low-frequency ambient noise field in the South China Sea during the 2001 ASIAEX experiment. IEEE Journal of Oceanic Engineering, 29(4): 1308-1315 Wenz G M. 1962. Acoustic ambient noise in the ocean: spectra and sources. J Acoust Soc Am, 34(12): 1936-1956
点击查看大图
计量
- 文章访问数: 1312
- HTML全文浏览量: 50
- PDF下载量: 1936
- 被引次数: 0