海洋地磁测量资料的虚拟检查线调差方法

在海洋磁力测量中,因受测量环境及各项改正的残余量等因素的系统性影响,不同测线间存在着不同程度的系统差,这种测线系统差会使测区磁场水平不统一,导致磁异常等值线图失真。为此,研究了基于虚拟检查线的海洋地磁测量数据调差方法,该方法尝试在不使用检查线数据情况下,沿垂直于测线方向选取一定数量的虚拟检查线,根据测线数据拟合出各条虚拟检查线上场的分布规律,并将测线方向拟合前后残差的平均值作为各条测线上的测线系统差,对各条测线数据进行改正。仿真计算与分析表明:对于磁异常变化较平缓的测区,该方法可以有效消除测线系统差;当磁异常变化剧烈时,该方法可以部分消除测线系统差。

An Adjustment Method of Subjunctive Reference Lines in Marine Magnetic Survey

In a marine magnetic survey,due to a relatively unstable environment,the remnant errors after correction and other common systematic effects,magnetic data measured in a survey line contains certain systematic error which makes the adjacent survey lines have different errors.This kind of system errors between survey lines will lead to unreal contour lines on magnetic anomaly map.For this problem,the subjunctive reference lines are used to adjust the systematic error between survey lines in this paper,and simulation experiment is designed.The results show that the method can effectively improve the distortion of contour lines on magnetic anomaly map and prove that the method has certain feasibility.