顾及卫星PCO改正的BDS-3卫星差分码偏差精确估计  

BDS-3 satellite difference code bias estimation with satellite phase center offset correction applied

作　　者：李阳 王宁波 李子申 汪亮 李宗义 LI Yang;WANG Ningbo;LI Zishen;WANG Liang;LI Zongyi(Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China;School of Electronic,Electrical and Communication Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院空天信息创新研究院,北京100094 [2]中国科学院大学电子电气与通信工程学院,北京100049

出　　处：《测绘学报》2023年第9期1460-1468,共9页Acta Geodaetica et Cartographica Sinica

基　　金：国家重点研发计划(2021YFB1407002);国家自然科学基金(42122026,42174038,42074043)。

摘　　要：精确的差分码偏差改正信息是实现全球导航卫星系统多频数据精密应用的基础,而现有DCB参数估计方法及数据产品中并未考虑天线相位中心偏移的误差影响。以BDS-3为例,本文在分析BDS-3卫星PCO变化特性及其对DCB估值理论影响的基础上,推导了DCB参数中的PCO误差经验校正方法,同时提出了顾及PCO误差改正的DCB参数估计方法。利用国际GNSS服务组织全球分布的BDS-3基准站数据,实现了PCO改正前后C2I-C6I/C1P-C5P两类DCB参数的精确估计,并在BDS-3 C2I/C1P单频标准单点定位中开展定位验证。结果表明,PCO改正前后的卫星DCB差异最大可达0.60 ns,引起不同类型卫星间的DCB差异最大可达1.17 ns,DCB参数中的PCO误差对BDS-3定位应用的影响不可忽略。与未改正PCO误差的DCB产品对应的定位结果相比,基于PCO-estimated-DCB和PCO-corrected-DCB两种方案的BDS-3 SPP精度增益相当,在水平与高程方向定位精度分别提升了5.7%和6.8%。The precise different code bias(DCB)correction information is basically required in the high-precision applications of multi-frequency GNSS.It is noted that the phase center offset(PCO)errors have not yet been properly handled in the generation of GNSS DCBs.In this paper,we first checked the variation characteristics of satellite PCOs of BeiDou global navigation satellite system(BDS-3),and analyzed the PCO effects on the generated BDS-3 DCBs.The empirical PCO correction model for DCBs(i.e.,PCO-corrected-DCB)is then proposed,and the DCB estimation method with PCO correction applied(i.e.,PCO-estimated-DCB)is also presented.Using BDS-3 observation data from the International GNSS Service(IGS)stations,the BDS-3 C2I-C6I/C1P-C5P DCBs with/without PCO corrections are estimated.The BDS-3 C2I/C1P single-frequency standard point positioning(SF-SPP)utilizing precise satellite orbits and clocks is performed to check the quality of the generated DCBs.Results show that the differences between DCBs estimated with and without PCO corrections reach 0.60 ns.The DCB discrepancy between different satellite types of BDS-3 is up to 1.17 ns,indicating the PCO errors in the generated DCBs cannot be ignored in the associated positioning applications.Compared to the BDS-3 SF-SPP result applying DCBs without PCO corrections,the accuracy improvement of SF-SPP based on PCO-estimated-DCB and PCO-corrected-DCB is comparable.The positioning accuracy improves by 5.7%and 6.8%in horizontal and vertical components,respectively,for PCO-estimated-DCB and PCO-corrected-DCB generated solutions.

关 键 词：北斗三号 伪距偏差 差分码偏差 相位中心偏移 ANTEX格式 

分 类 号：P228[天文地球—大地测量学与测量工程]