使用MAMEA数据集的海洋磁力测量测线布设方法

Marine magnetic survey line layout method using MAMEA data

关键词:  测线方向  Sobel算子  地磁匹配导航  差分方程  MAMEA数据集

Key words:  Survey line direction  Sobel operator  Geomagnetic matching navigation  Difference equation  MAMEA dataset

摘要:

地磁基准图是地磁匹配导航的基础，测线的布设是海洋磁力测量的重要内容，对地磁基准图的精度控制和磁力测量效率起着关键作用。目前，在海洋磁力测线布设方向上存在难以利用先验信息合理确定最佳方向，且没有充分顾及测区磁力异常的变化特征。结合海洋磁力测量特点，提出使用Sobel算子和差分方程构建海洋地磁数据总体梯度计算模型以计算总梯度最大方向，并将其用于估算磁力测线方向。在没有先验磁测数据的情况下，利用MAMEA数据集计算测线布设方向，并通过实测数据验证了所提模型在不同测线间隔下仿真模拟和地磁匹配导航应用中所确定的测线方向的优异性能。结果表明：MAMEA数据集可以作为磁力测量测线布设方向的先验信息，且利用海洋地磁数据总体梯度计算模型得出的最大总梯度方向可有效提高磁测精度，降低均方根误差，并更大程度反映了地磁异常的细节信息，从而有效提高地磁匹配导航的精度。

Abstract:

The geomagnetic reference map is the basis for geomagnetic matching navigation, and the design of survey line layouts is an important part of marine magnetic survey, which plays a key role in the precision control of the geomagnetic reference map and the efficiency of the magnetic survey. At present, it is challenging to determine the best direction reasonably by using priori information in the layout direction of marine magnetic survey line, and it does not fully take into account the changing characteristics of magnetic anomalies within the survey area. To slove this problem, it is proposed to use the Sobel operator and difference equation to construct the total gradient calculation model of marine geomagnetic data to calculate the maximum direction of the total gradient, which is used to estimate the direction of the magnetic survey line. In the absence of a priori magnetic survey data, the MAMEA dataset is used to calculate the direction of the line layout, and the measured data are used to verify the excellent performance of the proposed model-determined line direction in simulations with different line intervals and in geomagnetic matching navigation applications. The results show that the MAMEA dataset can be used as a priori information of magnetic survey line layout direction, and the maximum total gradient direction derived from the total gradient calculation model of marine geomagnetic data can significantly improve the accuracy of magnetic survey, reduce the root mean square error, and reflect the details of the geomagnetic anomalies to a greater extent, which can effectively improve the accuracy of geomagnetic matching navigation.