地磁匹配中位场频率域延拓方法研究

The Application of the Frequency Domain Continuation in the Geomagnetism Matching and Its Error Research

针对飞行器地磁匹配导航系统对不同高度基准图的需求,着重研究了基准图的频率域向上和向下延拓方法。为了验证延拓方法的精度和对误差的放大效果,提出了一套验证方法,并基于区域均匀网格化数据对延拓方法进行了验证。结果表明:所选用的向上延拓和向下延拓方法符合飞行器地磁匹配系统基准图的精度要求,延拓精度较高,对扰动误差等具有较好的抑制作用。

According to the demand of geomagnetic reference map for the cruise missile geomagnetism matching guidance system,this paper focuses on the frequency domain iteration upward continuation and downward continuation method for geomagnetic reference map.In order to verify the precision of continuation method and the effect of error magnification,a sort of verification method is presented,and this continuation method is verified on the basis of even grid data.The results show that the upward continuation and downward continuation method we presented satisfy the precision demand of geomagnetic reference map for the cruise missile geomagnetism matching guidance system,the precision of continuation is better,and the disturbing error is highly inhibited.