船舶轴频电磁场信号的海底测量及其特性分析  

Seabed survey and property analysis of ship's shaft-rate electromagnetic signal

作　　者：徐震寰 李予国[1,2] 罗鸣[1] XU Zhenhuan;LI Yuguo;LUO Ming(College of Marine Geosciences,Ocean University ofChina,Qingdao 266100,China;KeyLaboftheMinistryofEducation on Seabed Geosciences and Prospecting Techniques,Ocean University of China,Qingdao266100,China)

机构地区：[1]中国海洋大学海洋地球科学学院,山东青岛266100 [2]海底科学与探测技术教育部重点实验室,山东青岛266100

出　　处：《哈尔滨工程大学学报》2018年第4期652-657,共6页Journal of Harbin Engineering University

基　　金：国家自然科学重点基金项目(41130420)

摘　　要：为防止海水的腐蚀,现代船舶普遍安装了阴极保护系统,不同金属材料间产生的腐蚀电流和阴极保护系统产生的防腐电流经转动轴调制后均会产生轴频电场。为探讨不同船速和水深时船舶轴频电磁场信号的时频特性,对在南黄海和南海海域实测的轴频电磁场数据进行了分析。研究表明:轴频电磁场信号的探测范围与船舶航速和海水深度无关,而仅与海底观测点至船舶的斜距有关;对于试验所使用的中型船只而言,海底轴频电场信号的探测半径可达到600 m以上。Modern ships are generally installed with a cathodic protection system to prevent sea water corrosion.The shaft-rate electromagnetic field is generated after modulation of both the corrosion current generated between different metal materials and the anticorrosion current generated by the cathodic protection system by the axis of rotation.To investigate the time-frequency properties of the shaft-rate electromagnetic signal of a ship at different speeds and depths,this paper analyzes data of the shaft-rate electromagnetic field in the South Yellow Sea and South China Sea.Results show that the detection range of the shaft-rate electromagnetic signal has no bearing on the ship rate and water depth and is only related to the slant distance between an observation point at the seabed and the ship.For the medium-sized ship used in a test,the detection radius of the seabed shaft-rate electromagnetic signal reaches over 600 m.

关 键 词：轴频电场 海洋电磁环境 功率谱 信噪比 时频分析 探测范围 

分 类 号：P71[天文地球—海洋科学]