空间科学学报2018，Vol.38Issue(1)：88-93,6.DOI:10.11728/cjss2018.01.088
地磁场模型简化计算方法
Simplified Calculation Method of Geomagnetic Field Model
摘要
Abstract
To realize the application of geomagnetic navigation on the low orbit satellite,the complexity,enormous calculation,poor real time ability of traditional Gaussian spherical harmonica function should be solved before being used to calculate the geomagnetic vector.A geomagnetic field approximation function,Geomagnetic Field Approximation Functions (GFAF),is proposed to replace the spherical harmonic function.Dipole model under a pseudo-centers is utilized to replace the main geomagnetic model in GFAF method.And the coefficient of pseudo-center of different latitude-longitude grid is obtained by polynomial fit method.Finally,the geomagnetic field vector of any position can be achieved using different interpolation algorithm.A simulation test is carried out under the condition that the increment of latitude and longitude is 0.5° and the orbital height is from 300 to 500 km.The results show that the navigation accuracy of GFAF method is the same to that of geomagnetic field model.However,GFAF method effectively decreases the cost of computing and and improves the calculation efficiency.关键词
地磁场强度估计函数/多项式拟合/伪地心/地磁导航Key words
Geomagnetic field approximation function/Polynomial fit/Pseudo-center/Geomagnetic navigation分类
天文与地球科学引用本文复制引用
张涛,高东,郑建华..地磁场模型简化计算方法[J].空间科学学报,2018,38(1):88-93,6.基金项目
国家高技术研究发展计划项目资助(2015AA7026090) （2015AA7026090）
