| 引用本文: | 杜彦君,贾小林,姚顽强,等.卫星差分码偏差对北斗三号双频精密单点定位的影响.[J].国防科技大学学报,2024,46(1):42-50.[点击复制] |
| DU Yanjun,JIA Xiaolin,YAO Wanqiang,et al.Influence of satellite differential code bias on BDS-3 dual-frequency precise point positioning[J].Journal of National University of Defense Technology,2024,46(1):42-50[点击复制] |
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| 卫星差分码偏差对北斗三号双频精密单点定位的影响 |
| 杜彦君1,贾小林2,姚顽强1,许瑾3 |
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(1. 西安科技大学 测绘科学与技术学院, 陕西 西安 710054;2. 西安测绘研究所, 陕西 西安 710054;3. 长安大学 地质工程与测绘学院, 陕西 西安 710054)
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| 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。 |
| 关键词: 北斗三号系统 差分码偏差 精密单点定位 精度 收敛时间 |
| DOI：10.11887/j.cn.202401005 |
| 投稿日期：2021-10-13 |
| 基金项目:国家自然科学基金资助项目(41874041) |
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| Influence of satellite differential code bias on BDS-3 dual-frequency precise point positioning |
| DU Yanjun1, JIA Xiaolin2, YAO Wanqiang1, XU Jin3 |
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(1. College of Geomatics, Xi′an University of Science and Technology, Xi′an 710054, China;2. Xi′an Research Institute of Surveying and Mapping, Xi′an 710054, China;3. College of Geological Engineering and Geomatics, Chang′an University, Xi′an 710054, China)
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| 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. |
| Keywords: BDS-3 differential code bias precise point positioning accuracy convergence time |
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