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1、广域差分系统星钟和星历误差修正新方法研究*李孝辉蔡成林吴海涛薛艳荣边玉敬(中国科学院国家授时中心,陕西生西安市临潼区书院东路3号,710600中国科学院精密导航定位与定时技术重点实验室,陕西生西安市临潼区书院东路3号,710600)摘要:传统的广域旁分系统将星钟和星历误差修到真值,这是针对GPS的屮轨卫星星应开发出來的方法。在我国发展的COMPASS_
2、J星导航系统中,采用高轨和中轨结合的混合星座,与GPS星座相比,不但卫星所处环境、轨道控制方式有很大差别,而且地而观测高轨卫星的DOP值是小轨卫星的几倍,对GPS系统最优的广域差分修正量计算方法并不一定适合混
3、合星座,如何开发适合混合星座的改正数计算方法是我们发展卫星导航系统必须要解决的问题。结合COMPASS的特点,提出了星钟和星历谋差修正的新方法,将星钟和星历谋差解算过程分离,先计算星钟改正数,再计算星历改正数,将四维时空解算变为三维空间解算,可以极大降低DOP值的影响,提高定位粘度。对这种方法进行了理论分析,针对GPS的中轨星座和COMPASS的混合星座,对这种方法进行了仿真验证。关键词:卫星导航;广域差分;算法Researchonnewmethodofsatelliteclockerrorsandephemeriserrorscorrectioninwid
4、eareadifferentialsystemLiXiaohuiCaiChenglinWuHaitaoXueYanrongBianYujing(1.NationalTimeServiceCenter,ChineseAcademyofSciences,Lintong,Shanxi,China,710600;2.KeyLaboratoryofPreciseNavigationandTimingTechnology,NationalTimeServiceCenter,ChineseAcademyofSciences,Lintong»Shanxi»China,710
5、600)Abstract:SatelliteclockerrorsandephemeriserrorsarecoiTectedtothetruevalueintraditionalwideareadifferentialsystem,whichisadevelopedmethodforthemediumearthorbitsatelliteconstellationofGPS.InthedevelopmentofCOMPASSsatellitenavigationsysteminourcountry,usingthehybridconstellationco
6、mbininghighearthorbitwithmediumearthorbit,incomparisonwiththeGPSconstellation,notonlysatellitesandtheirenvironment,methodsoforbitcontrolarcverydifferent,butalsoDOPvalueswithground-basedobservationsofhighorbitsatellitesisthemediumearthorbitsatellitesofthetimes,forwideareadifferentia
7、lGPSsystem,theoptimalmethodofcalculatingtheamountofthediflerentalcorrectionisnotnecessarilysuitableforhybridconstellation,howtodevelopthemethodofcalculatingthedifferentalcorrectionformixed-constellalionmustbeaddressedinourdevelopmentofsatellitenavigationsystems.Combiningthecharacte
8、risticsofCOMPASS,thenewmethodofthesatelliteclockandephemeriserrorcorrectionisproposed,theprocessofsolutionofsatelliteclockandephemeriserrorisseparated,firstcalculatingthenumberofsatelliteclockcorrections,thenephemeriscorrections,andinthisway,solverforfour-dimcnsionalspacc-timcwillb
9、echangedintosolverfortheth