拖曳式海洋地磁三分量测量系统的设计与试验  

Design and experiment of a towed marine magnetic three-component measurement system

作　　者：付碧波 李海兵 罗建刚[1] 郭子伟 王友东 FU Bibo;LI Haibing;LUO Jiangang;GUO Ziwei;WANG Youdong(Qingdao Marine Science and Technology Center,Qingdao 266237,China;Beijing Institute of Aerospace Control Devices,Beijing 100039,China)

机构地区：[1]青岛海洋科技中心,山东青岛266237 [2]北京航天控制仪器研究所,北京100039

出　　处：《海洋测绘》2023年第4期15-18,23,共5页Hydrographic Surveying and Charting

基　　金：国家自然科学基金(41976182);山东省重大科技创新工程(2018SDKJ0201);青岛海洋科学与技术试点国家实验室问海计划(2021WHZZB0400);中国航天科技集团创新基金(天科研[2021]397)。

摘　　要：针对现有拖曳式海洋磁力测量通常只能获取地磁总场信息,不能获得地磁矢量信息的问题,提出了一种拖曳式海洋地磁三分量测量系统设计方案。测量系统通过INS/GNSS组合导航进行定位定姿,搭载的三分量磁力仪与惯导通过高精度定位板刚性固定,经过数学平台的坐标变换,进而将拖体任意姿态下的海洋地磁场三分量数据归算到地理坐标系下。此外,对拖体进行了水动力分析,提高姿态稳定性的同时减小了阻力。经过海上试验和数据处理,系统获得的三分量数据在平差前的重复线内符合精度分别为东向6.8 nT、北向4.1 nT、地向8.0 nT,交叉点内符合精度分别为东向19.1 nT、北向19.5 nT、地向15.4 nT。结果表明该系统可为海洋矢量磁力测量提供良好的测量平台,为后续的海洋磁力测量提供实践经验和工程参考。Generally,towed marine magnetic measurement is dominated by the geomagnetic total field scalar,so geomagnetic vector data cannot be obtained.For this purpose,marine magnetic three-component measurement system was developed.The position and attitude of the measurement system were determined by the integrated navigation system composed of GNSS and INS.The three-component magnetometer and the INS were fixed rigidly by the high precision positioning plate.The magnetic three-component data acquired in any attitude of the towed vehicle were transformed to the geographic coordinate system by coordinate transformation of the digital platform.The hydrodynamic analysis was carried out to improve stability and reduce resistance.Based on the marine survey test and data processing,the three-component geomagnetic data were obtained.Before the adjustment computation,the internal coincidence accuracy of the repeated lines reached 6.8nT in the east,4.1 nT in the north,8.0 nT in the earthward direction and the intersections reached 19.1 nT,19.5 nT,15.4 nT respectively.The results indicated that the system provided a feasible platform for marine magnetic vector measurement and practical experience for subsequent marine magnetic measurement.

关 键 词：海洋磁力测量 地磁矢量 磁干扰补偿 拖曳系统 精度计算 

分 类 号：P229.233[天文地球—大地测量学与测量工程]