卫星差分码偏差对北斗三号双频精密单点定位的影响
2024,46(1):42-50
杜彦君
西安科技大学 测绘科学与技术学院, 陕西 西安 710054，duyanjun@stu.xust.edu.cn
贾小林
西安测绘研究所, 陕西 西安 710054
姚顽强
西安科技大学 测绘科学与技术学院, 陕西 西安 710054
许瑾
长安大学 地质工程与测绘学院, 陕西 西安 710054
西安科技大学 测绘科学与技术学院, 陕西 西安 710054，duyanjun@stu.xust.edu.cn
贾小林
西安测绘研究所, 陕西 西安 710054
姚顽强
西安科技大学 测绘科学与技术学院, 陕西 西安 710054
许瑾
长安大学 地质工程与测绘学院, 陕西 西安 710054
摘要：
为探讨北斗三号系统不同频点组合卫星差分码偏差(differential code bias,DCB)对精密单点定位(precise point positioning,PPP)的影响,推导北斗三号系统不同频点无电离层组合卫星端DCB改正模型,并基于MGEX跟踪站连续7天4站的观测数据按7种不同双频组合进行DCB改正实验。结果表明,DCB改正对PPP精度在最初的历元有明显提升,有助于滤波的收敛及提高单天解的均方根,但对于最终定位精度无明显提升。B2a/B3I及B2b/B3I组合定位精度及收敛速度明显低于其他组合,DCB改正后有所提升。其他5种组合改正后定位精度及收敛时间相当:静态PPP单天解均方根在E、N和U方向约为5.50 cm、2.50 cm和6.25 cm,较未改正前提升20%~65%；平均收敛时间为38 min,提升约6%；动态PPP平均收敛时间为59 min,提升约20%；最终定位精度水平方向优于5 cm,高程方向优于7 cm。
为探讨北斗三号系统不同频点组合卫星差分码偏差(differential code bias,DCB)对精密单点定位(precise point positioning,PPP)的影响,推导北斗三号系统不同频点无电离层组合卫星端DCB改正模型,并基于MGEX跟踪站连续7天4站的观测数据按7种不同双频组合进行DCB改正实验。结果表明,DCB改正对PPP精度在最初的历元有明显提升,有助于滤波的收敛及提高单天解的均方根,但对于最终定位精度无明显提升。B2a/B3I及B2b/B3I组合定位精度及收敛速度明显低于其他组合,DCB改正后有所提升。其他5种组合改正后定位精度及收敛时间相当:静态PPP单天解均方根在E、N和U方向约为5.50 cm、2.50 cm和6.25 cm,较未改正前提升20%~65%；平均收敛时间为38 min,提升约6%；动态PPP平均收敛时间为59 min,提升约20%；最终定位精度水平方向优于5 cm,高程方向优于7 cm。
基金项目：
国家自然科学基金资助项目(41874041)
国家自然科学基金资助项目(41874041)
Influence of satellite differential code bias on BDS-3 dual-frequency precise point positioning
DU Yanjun
College of Geomatics, Xi′an University of Science and Technology, Xi′an 710054, China,duyanjun@stu.xust.edu.cn
JIA Xiaolin
Xi′an Research Institute of Surveying and Mapping, Xi′an 710054, China
YAO Wanqiang
College of Geomatics, Xi′an University of Science and Technology, Xi′an 710054, China
XU Jin
College of Geological Engineering and Geomatics, Chang′an University, Xi′an 710054, China
College of Geomatics, Xi′an University of Science and Technology, Xi′an 710054, China,duyanjun@stu.xust.edu.cn
JIA Xiaolin
Xi′an Research Institute of Surveying and Mapping, Xi′an 710054, China
YAO Wanqiang
College of Geomatics, Xi′an University of Science and Technology, Xi′an 710054, China
XU Jin
College of Geological Engineering and Geomatics, Chang′an University, Xi′an 710054, China
Abstract：
To explore the influence of BDS-3(BeiDou navigation satellite system phase Ⅲ) different frequency combination satellite DCB(differential code bias) on PPP(precise point positioning), the BDS-3 different frequency ionospheric-free combined satellite DCB correction model was derived and performed DCB correction experiments by seven different dual-frequency combinations based on the observation data of four MGEX stations during seven consecutive days. The results show that the DCB correction has a significant improvement of the PPP accuracy in the initial epoch, which helped to converge the filtering and improve the RMS of the single-day solution, but weakly in the final positioning accuracy. Although the positioning accuracy of the B2a/B3I and B2b/B3I combinations′ convergence speed are considerably thinner than other combinations, it still enhances after DCB correction. Otherwise, the positioning accuracy and convergence time of the other 5 combinations are equivalent after correction. The RMS of the static PPP single-day solution is about 5.50 cm, 2.50 cm, and 6.25 cm in the E, N, and U directions, which are approximately 20%～65% higher than before. The average convergence time, an increase of about 6%, is 38 minutes. And the kinematic PPP, an increase of about 20%, is 59 minutes. The final positioning accuracy is better than 5 cm in the horizontal component and 7 cm in the elevation component.
To explore the influence of BDS-3(BeiDou navigation satellite system phase Ⅲ) different frequency combination satellite DCB(differential code bias) on PPP(precise point positioning), the BDS-3 different frequency ionospheric-free combined satellite DCB correction model was derived and performed DCB correction experiments by seven different dual-frequency combinations based on the observation data of four MGEX stations during seven consecutive days. The results show that the DCB correction has a significant improvement of the PPP accuracy in the initial epoch, which helped to converge the filtering and improve the RMS of the single-day solution, but weakly in the final positioning accuracy. Although the positioning accuracy of the B2a/B3I and B2b/B3I combinations′ convergence speed are considerably thinner than other combinations, it still enhances after DCB correction. Otherwise, the positioning accuracy and convergence time of the other 5 combinations are equivalent after correction. The RMS of the static PPP single-day solution is about 5.50 cm, 2.50 cm, and 6.25 cm in the E, N, and U directions, which are approximately 20%～65% higher than before. The average convergence time, an increase of about 6%, is 38 minutes. And the kinematic PPP, an increase of about 20%, is 59 minutes. The final positioning accuracy is better than 5 cm in the horizontal component and 7 cm in the elevation component.
收稿日期：
2021-10-13
2021-10-13
