浅地层剖面仪噪声特征分析及采集参数优选  

Noise Characteristics Analysis of Sub-Bottom Profiler and Optimization of Field Acquisition Parameters

作　　者：张彬彬 赵国兴 吴永亭 张道建 张海泉 孙杨 刘凯 ZHANG Bin-bin;ZHAO Guo-xing;WU Yong-ting;ZHANG Dao-jian;ZHANG Hai-quan;SUN Yang;LIU Kai(First Institute of Oceanography, MNR, Qingdao 266061, China)

机构地区：[1]自然资源部第一海洋研究所,山东青岛266061

出　　处：《海洋科学进展》2020年第3期455-462,共8页Advances in Marine Science

基　　金：国家自然科学基金项目——多道地震与海底地震仪联合处理在深部构造探测中的应用—以南黄海OBS2013测线为例(41604046)。

摘　　要：浅地层剖面仪具有配置灵活、作业方便、经济高效、分辨率高等优点,在海洋地质研究和海洋工程调查中得到了广泛应用,但易受到噪声干扰。在分析浅地层剖面仪运行时干扰噪声形成机理的基础上,设计噪声采集方案,采集设备运行时的背景噪声和其他声学设备干扰,分析干扰噪声特征,为现场数据采集以及室内数据处理提供依据。通过分析浅地层剖面仪的噪声特征,提出控制激发频率范围,将激发能量集中在优势频带内,并在采集时设置合理滤波参数,滤除其他声学设备干扰噪声。以“向阳红01”科考船浅地层剖面仪为例,设置激发子波频带:1.0~6.0 kHz,脉冲长度设置为10 ms,信号接收时设置滤波门限为1.0-2.0-6.0-10.0 kHz,去除其他声学设备对剖面的干扰,最终取得非常理想的浅地层剖面。The Sub-Bottom Profiler with advantages of flexible configuration,convenient operation,economic efficiency and high resolution,has been widely applied in the marine geology research and marine engineering investigation,and yet it is susceptible to noise interference.Based on analyzing the formation mechanism of the interference noise at the time of running the Sub-Bottom profiler,we design a data acquisition project to acquire the background noise and the interference noise of other acoustic equipment.Then analyzing characteristics of these noises will provide the basis for data acquiring and processing.Based on the noise characteristics,we propose that it is necessary to limit the range of transmitter frequency,and focus the energy on the superiority frequency band,and to apply reasonable filtering parameters to filter the noise of the other acoustic equipment.Finally,Taking the TOPAS PS 18 Parametric Sub-Bottom Profiler as an example,we set the source frequency range of′1.0~6.0 kHz′,the pulse length of 10 ms,and the filtering threshold of 1.0-2.0-6.0-10.0 kHz,to suppress the noise from the other acoustic equipment,and we obtained a perfect sub-bottom profile.

关 键 词：浅地层剖面仪 背景噪声 声学干扰 现场采集 噪声压制 

分 类 号：P716[天文地球—海洋科学]