海洋磁力测量中多站地磁日变改正值计算方法研究

研究了海洋磁力测量多站日变改正值的计算方法，采用多站同步实例分析了加权平均法和函数拟合法在海洋磁力测量地磁日变改正中的应用，探讨了适合海洋磁力测量特点的多站日变改正值计算方法.结论表明：加权平均法和函数拟合法是多站日变改正值计算的有效方法.忽略经度效应的影响，采用纬距加权或纬度坐标拟合，可以改善加权平均法或函数拟合法效果.海洋磁力测量日变站大多建在测区附近的沿岸，导致多个日变站网的图形结构较差，建议采用纬距加权平均法.

Research on computation method of multi-station diurnal variation correction in marine magnetic surveys

The computation method of multi-station geomagnetic diurnal variation correction have been studied. The applicability of the weighted mean value method and function fitting method have been analyzed by the synchronously observed data. The method which are fit for the characteristics of marine magnetic survey has been brought forward. The conclusion show that both two method are effective in multi-station geomagnetic diurnal variation correction. With the neglect of longitudinal effect, the precision of both method can be greatly improved. Considered the graphic structures of the base stations in marine magnetic surveys, the weighted mean value with latitudinal distance are advised to computation of correction value.