半参数模型在区域地磁场建模中的应用

Application of Semi-parametric Model in Regional Geomagnetic Field Modeling

地磁场本身及环境影响使测量数据存在着各种误差,为了更好地实现区域地磁场建模,在多项式的基础上添加一个非参数分量构成半参数回归模型,并且将半参数回归模型与原有的多项式拟合模型的拟合结果进行对比。结果表明,半参数回归模型避开参数模型的局限性的同时也填补了无参数模型的缺点,在区域地磁场建模中可以达到更好的拟合效果,所构建的区域地磁场模型也更加贴近客观实际。

There are various errors in the measurement data due to the influences of the geomagnetic field and the environment.In order to realize the regional geomagnetic field modeling better,a nonparametric component was added to form a semi-parametric regression model on the basis of the polynomial,and the semi-parametric regression model was compared with the original model.The results show that the semiparametric regression model,avoids the limitations of the parametric model and also fills up the shortcomings of the nonparametric model,and that it can achieve a better effect in the geomagnetic field modeling.The magnetic field model constructed by the semi-parametric regression model is also more close to the objective reality.