第51卷第3期2023年3月华中科技大学学报(自然科学版)J.HuazhongUniv.ofSci.&Tech.(NaturalScienceEdition)Vol.51No.3Mar.2023GPS相位模糊度固定对钟差解算的影响研究郭向1,2(1.华中科技大学精密重力测量国家重大科技基础设施,湖北武汉430074;2.华中科技大学物理学院引力中心,湖北武汉430074)摘要分析了全球定位系统(GPS)载波相位模糊度固定对接收机钟差解算的影响,并利用GRACE-FO实测数据基于不固定模糊度、固定单差模糊度和固定双差模糊度三种方法解算了三组钟差,最后通过与官方产品比较和重叠弧段比较两种方法进行了质量评估.结果显示:固定单差模糊度和固定双差模糊度所解算的相对钟差与官方产品差异的标准差(17.2和13.2ps)比不固定模糊度(32.8ps)分别减小了48%和60%;重叠弧段差异标准差(2.3和0.7ps)比不固定模糊度(11.4ps)分别减小了80%和94%,比官方产品(3.6ps)分别减小了36%和81%.以上结果表明固定GPS相位模糊度可显著改善相对钟差精度.关键词全球定位系统(GPS);重力恢复与气候实验(GRACE);模糊度固定;接收机钟差;卫星重力中图分类号P228文献标志码A文章编号1671-4512(2023)03-0108-06ResearchonimpactsofGPScarrierphaseambiguityresolutiononreceiverclockoffsetsGUOXiang1,2(1.NationalPreciseGravityMeasurementFacility,HuazhongUniversityofScienceandTechnology,Wuhan430074,China;2.CenterforGravitationalExperiment,SchoolofPhysics,HuazhongUniversityofScienceandTechnology,Wuhan430074,China)AbstractTheimpactsofglobalpositioningsystem(GPS)carrierphaseintegerambiguityresolution(IAR)onreceiverclockoffsetswereanalyzed.Forthatpurpose,threesetsofreceiverclockswerecomputedfromtheGRACE-FOdatabasedonun-differencefloatambiguityresolution(FAR-UD),single-differenceIAR(IAR-SD),anddouble-differenceIAR(IAR-DD).Theywerethenassessedthroughcomparisonwiththeofficialclocksandintheoverlaps.Theresultsrevealedthatthestandarddeviations(STDs)oftherelativeclockdifferencesbetweenthecomputedandtheofficialclockswerereducednotablyby48%and60%forIAR-SD(17.2ps)andIAR-DD(13.2ps),respectively,whencomparedtoFAR-UD(32.8ps).TheSTDdifferencesintheoverlapswerereducedremarkablyby80%and94%forIAR-SD(2.3ps)andIAR-DD(0.7ps),respectively,whencomparedtoFAR-UD(1...