北斗GEO卫星多径误差的分析与估计  

The Analysis and Estimation of BeiDou GEO Satellite Multipath Error

作　　者：贾珊[1] 肖志斌[1] 唐小妹[1] 王飞雪[1] 

机构地区：[1]国防科学技术大学电子科学与工程学院,长沙410073

出　　处：《全球定位系统》2016年第5期51-55,共5页Gnss World of China

摘　　要：北斗卫星导航系统由5颗地球静止轨道(GEO)卫星,5颗倾斜地球同步轨道(IGSO)卫星和4颗中远地球轨道(MEO)卫星组成,GEO卫星相对地面近似静止,因此GEO卫星多径误差难以通过长时间平均来消除。关于GEO卫星多径误差的特性已经有了很多的结果,比如GEO卫星的多径误差具有天周期性,这与GEO轨道周期是相同的,而且已经证明GEO多径相邻两天的低频分量相似度可达70%.本文从载噪比和GEO卫星多径误差的关系出发,针对GEO卫星多径误差,提出一种新的多径估算方法,实验证明该方法对GEO卫星多径误差的估计误差小于0.5%.BeiDou navigation satellite system consists of 5satellites in Geostationary Orbit（GEO）,5satellites in Inclined Geosynchronous Orbit（IGSO）and 4satellites in Median earth orbit（MEO）.GEO satellites are relative static with earth,so the GEO multipath cannot be eliminated by a long time observation.There are many analysis about the characters of the GEO multipath.For example,the cycle of the GEO multipath is one sidereal day,which is consistent with the orbit period.It is also showed that the cross-correlation coefficients between the low-frequency components of two consecutive days are larger than 0.7.There come up with an idea,make a use of the relationship between the GEO multipath and carrier to noise ratio,propose a new estimate algorithm of the GEO multipath.The experimental results show that the estimation error is less than 0.5percent.

关 键 词：GEO卫星多径误差 载噪比 多项式拟合 

分 类 号：P228.4[天文地球—大地测量学与测量工程]