利用GPS数据与Klobuchar模型估计地磁北极  

Estimating geomagnetic north pole based on GPS data and Klobuchar

作　　者：郭英[1,2] 程鹏飞[2] 吕洪标[1] 纪冬华[1] 

机构地区：[1]山东科技大学海岛(礁)测绘技术国家测绘局重点实验室,青岛266510 [2]中国测绘科学研究院,北京100830

出　　处：《地球物理学进展》2012年第4期1401-1405,共5页Progress in Geophysics

基　　金：中国测绘科学研究院基础测绘项目(7771119,7771017);海岛(礁)测绘技术国家测绘局重点实验室项目(2010B02)联合资助

摘　　要：基于地磁坐标和地理位置的关系,利用Newton迭代法推导了地磁北极的计算公式;根据Klobuchar模型中电离层电子含量与地磁位置的关系,给出地磁位置的表达式;进而建立了GPS观测量估计地磁北极的模型.理论分析和数据验证了方法的可行性,得出1)Klobuchar模型属于全球性的电离层估计模型,对于区域性电离层信息描述的不十分准确,建立区域化Klobuchar模型将更有利于地磁北极的估计;2)利用泰勒公式将Klobuchar模型线性化的过程中,公式仅取其一阶项,将会影响模型的精度,有待于提高模型的展开阶数;3)实际中地磁北极的估计结果受初始值得约束;4)不同计算方法和模型对结果的可靠性有所影响,试图选择其它估计过程和方法,提高估计的可靠性.Based on the relationship between the geomagnetic coordinates and geographic location, the calculation formula of the geomagnetic north is deduced with Newton iterative method. The expression of geomagnetic north- pole position is studied according to the relation between electronic content and its location in the Klobuchar model. The geomagnetic north model has been further established by GPS data. This method was validated to be feasible by theoretical analysis and simulated data, and some conclusions are obtained： 1） The Klobuchar model estimates effectively the global ionosphere delay, and establishing the regional Klobuchar model would estimate more perfectly geomagnetic north-pole; 2） Using Taylor formula to linearize the Klobuchar model, it would reduce the precision of the model when the Formula only took one order number. Thus it is necessary to improve exploded order numbers of the model; 3） Practically, the results of estimating geomagnetic north is constrained by initial values; 4） It would affect the reliability of estimating geomagnetic north-pole when using different calculation method and model, so try to use other methods and models, it would improve the reliability of estimating geomagnetic north-pole.

关 键 词：GPS数据 电离层 KLOBUCHAR模型 地磁北极 

分 类 号：P318[天文地球—固体地球物理学]