北斗三频非组合精密单点定位频间钟偏差改正比较分析  

Comparison and analysis of inter-frequency clock bias correction for BeiDou triple-frequency uncombined precise point positioning

作　　者：李伟 白天阳 陈向东 冷宏宇 李开元 LI Wei;BAI Tianyang;CHEN Xiangdong;LENG Hongyu;LI Kaiyuan(State Grid Location Based Service Co.,Ltd.,Beijing 102209,China;State Grid Information Communication Industry Group Co.,Ltd.,Beijing 102211,China)

机构地区：[1]国网思极位置服务有限公司,北京102209 [2]中国电信股份有限公司卫星应用技术研究院 [3]国网信息通信产业集团有限公司,北京102211

出　　处：《全球定位系统》2025年第1期60-68,共9页Gnss World of China

基　　金：关键技术及应用研究专项(52680024000K)。

摘　　要：针对传统的精密钟差产品不能直接用于北斗卫星导航系统(BeiDou Navigation Satellite System, BDS)三频非组合精密单点定位(precise point positioning,PPP)第三频点相位观测值的问题,本文使用亚太地区的北斗二号(BeiDou-2 Navigation Satellite System, BDS-2)测站和全球区域内的北斗三号(BeiDou-3 Navigation Satellite System, BDS-3)测站计算了其各自的卫星频间钟差偏差(inter-frequency clock bias, IFCB)并分析了其时间特性,同时比较了使用计算的IFCB进行改正和使用CNES的Bias产品进行改正的BDS三频非组合PPP的定位结果.结果表明,BDS-2的IFCB量级不超过3 cm,BDS-3的IFCB量级不超过2 cm.同不改正IFCB相比,使用IFCB改正的BDS-2三频非组合PPP三维定位精度提高了14.07%,第三频点验后相位残差降低了8.82%.而使用CNES的Bias产品改正的BDS-2三频非组合PPP定位精度和第三频点验后相位残差均变差(4.94%和2.94%).使用CNES的Bias产品改正的BDS-3三频非组合PPP定位精度的提升效果(23.02%)优于使用IFCB产品改正的提升效果(5.28%),两种改正方法的第三频点验后相位残差与不改正基本相当.Addressing the issue that the traditional precise clock offset products cannot be directly used for the third frequency of BDS triple-frequency uncombined precise point positioning(PPP)phase observations,this paper calculated the inter frequency clock bias(IFCB)using BDS-2 stations in the Asia Pacific region and BDS-3 stations in the global region and analyzed their time characteristics.Meanwhile,the positioning results of BDS triple-frequency uncombined PPP corrected using the calculated IFCBs and CNES Bias products were compared.The results indicate that the magnitude of IFCB of BDS-2 is within 3 cm,and the magnitude of IFCB of BDS-3 is within 2 cm.Compared with no IFCB correction,the 3D positioning accuracy of BDS-2 triple-frequency uncombined PPP improved by 14.07%when using IFCB correction,and the posterior phase residual was reduced by 8.82%.However,the BDS-2 triple-frequency uncombined PPP corrected by CNES’s Bias product is getting worse in both positioning accuracy(4.94%reduction)and posterior phase residual(2.94%increase).The improvement effect of BDS-3 triple-frequency uncombined PPP positioning accuracy corrected by CNES’s Bias product(23.02%)is better than that corrected by IFCB product(5.28%),and the posterior phase residual of the two correction methods is basically equivalent to that without correction.

关 键 词：北斗卫星导航系统(BDS) 精密单点定位(PPP) 三频 非组合 频间钟差偏差(IFCB) 

分 类 号：P228.4[天文地球—大地测量学与测量工程]