基于PPP-B2b改正数增强的低轨卫星星载GNSS在轨实时定轨研究

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中图分类号：P228 文献标志码：A文章编号：1003-3114（2025）06-1204-10开放科学（资源服务）标识码（OSID）：

Abstract：Real-timeorbitdeterminationusingobservationsfromonboardGlobalNavigationSateliteSystem（GNSS）receivershas becomeonemainstreamapproachtoobtaininghigh-precisioneal-timeorbitalparametersofLowEarthOrbit（LEO）satelies.Orbitand clockerorsinGNSSbroadcastephemerisarethepriaryfactorslmitingtereal-timeobitaccuracyofLEOsatelites.ForLEOsatellitesequippedwithGlobal PositioingSystem/eiouNavigationSateliteSystem-3（GP/BD-3）receivers，tissudyproosaply ingthe free PrecisePintPositioning-B2b（PPP-B2b）corectionproductsbroadcastbyBDS-3GeostationaryEarthOrbit（GEO）satellitestocorrettebroadcastephemerides，threbyehancingoboardreal-tieobitdeterminationaccuracy.UsingonboardG/BDS-3 measurementsfromtheLuTan-1A（LT-）satelite，smulatedreal-tieorbitdeterminatioexperimentswereconductedithadit outP-B2boris.Thesultsindcatethataplying-B2oretionssiicantlyiproesteal-teobieeation accuracyofLT-1A.Overtheentirearc，thereal-timeorbitdeterminationacuracybasedononboardGPSandBDS-3dataisimproved by 10.0% and 8，0% ，respectively.Since PPP-B2b corrections are regional products availableonlywithin the Asia-Pacific region centeredon China，the improvements are morepronounced whenLT-1A passes overthis region，with accuracy improvements of 24.5% and 11. 7% ，respectivelyAsPPP-B2bcorectionsarefrelyavailable，theyofersubstantialappicationvalueforthelargenumberofdomestic LEO satellites equipped with onboard GPS/BDS-3 receivers.

Keywords：PPP-B2b corrections;real-time orbit determination;accuracy improvement

0 引言

自二十世纪八九十年代GPS测量应用于LEO卫星轨道测控开始[1]，星载GNSS测量以其成本低、设备轻便、观测数据丰富的特性，以及全天候、高精度、全弧段连续观测等优点，成为对地观测卫星最主流的定轨技术手段之—[2-4]。（剩余13351字）