摘要
地球主磁场长期变化是影响地磁导航基准图时效性的一个重要因素。提出一种以模型预测值对基准图进行时变修正的方法,利用主磁场长期变化模型解决临近空间地磁导航基准图的时变修正问题。基于WMM2010建立地球主磁场长期变化模型,在此基础上建立中国地区临近空间(海拔高度30 km)的主磁场长期变化模型,利用该模型计算出的地磁场分量长期变化率对基准图时变进行修正。仿真实验结果表明,修正后的地磁导航基准图的匹配概率可以达到90%以上,相比修正前有显著提高,且修正前后间隔时间越长效果越明显。利用主磁场长期变化模型修正后的地磁导航基准图具有良好的适配性。
Secular variation of main geomagnetic field is an important factor that influences the time-validity of geomagnetic navigation reference map.A method is proposed to update the variation using a model-predicted value.The secular variation model of main geomagnetic field is used to solve the time-variation problem of near-space geomagnetic navigation reference map.Secular variation model of the earth’s main geomagnetic field is modeled based on WMM2010,and depending on this model,the secular variation model of near-space in China（30 km above sea level） is modeled.Calculated secular variation rates of geomagnetic components are used to update the time-variation.Experiment results indicate that the matching probability of updated map can reach more than 90%,and the effect is better when the time-interval is longer.The updated reference map by the secular variation model of main geomagnetic field has good adaptability.
出处
《中国惯性技术学报》
EI
CSCD
北大核心
2011年第5期543-548,552,共7页
Journal of Chinese Inertial Technology
基金
国家自然科学基金(60874093
60904083)资助项目
关键词
临近空间
地磁导航
主磁场
WMM2010
长期变化建模
基准图修正
near-space
geomagnetic navigation
geomagnetic main field
WMM2010
secular variation model
reference map update
