1.武汉大学测绘学院,湖北 武汉,430079
2.湖北珞珈实验室,湖北 武汉,430079
3.武汉大学中国南极测绘研究中心,湖北 武汉,430079
许国振,硕士,主要从事实时精密单点定位方面的研究。guozxu@whu.edu.cn
任晓东,博士,教授。xdren@whu.edu.cn
收稿:2024-06-18,
纸质出版:2025-11-05
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许国振,任晓东,张小红.CNES多系统OSB产品质量分析及实时精密单点定位性能评估[J].武汉大学学报(信息科学版),2025,50(11):2352-2364.
XU Guozhen,REN Xiaodong,ZHANG Xiaohong.Quality Analysis of Multi-GNSS OSB Products from CNES and Its Performance Evaluation of Real-Time Precise Point Positioning[J].Geomatics and Information Science of Wuhan University,2025,50(11):2352-2364.
许国振,任晓东,张小红.CNES多系统OSB产品质量分析及实时精密单点定位性能评估[J].武汉大学学报(信息科学版),2025,50(11):2352-2364. DOI:10.13203/j.whugis20230376
XU Guozhen,REN Xiaodong,ZHANG Xiaohong.Quality Analysis of Multi-GNSS OSB Products from CNES and Its Performance Evaluation of Real-Time Precise Point Positioning[J].Geomatics and Information Science of Wuhan University,2025,50(11):2352-2364. DOI:10.13203/j.whugis20230376
面向原始观测值的绝对信号偏差(observable-specific signal bias
OSB)为多频多模全球导航卫星系统数据处理提供了一种简单、统一的相位/伪距偏差修正方式,其实时产品质量直接决定了整数解实时精密单点定位(real-time precise point positioning with ambiguity resolution,RT PPP-AR)效果。法国国家空间研究中心(Centre National d’Etudes Spatiales
CNES)作为目前唯一公开提供实时OSB产品的研究机构,推动了多频多系统RT PPP-AR的实际应用。详细分析并评估了CNES实时OSB产品的质量及其RT PPP-AR定位性能,以便为更多实时精密定位用户应用提供参考。实验结果表明,在CNES实时OSB产品质量方面,其产品可用率、稳定性以及精度均具有较好表现。其中,GPS/Galileo/BDS三系统的相位/伪距OSB产品可用率达90%以上,但部分卫星(如G28、E02、E07、E21)可用率仅在40%~90%;GPS/Galileo相位OSB产品稳定性均优于0.1周,BDS稳定性略差于前两者,GPS/Galileo/BDS日平均标准差(standard deviation
STD)分别为0.085、0.117、0.228周;通过OSB修正以后,GPS/Galileo/BDS卫星宽巷和窄巷模糊度残差较小,其在±0.25周以内的百分比分别为92.37%、95.88%、86.58%和88.40%、91.53%、87.42%,可满足PPP模糊度固定的需求。利用多GNSS实验站实测数据验证其RT PPP-AR定位效果,结果表明,基于CNES实时OSB产品可实现动态厘米级RT PPP-AR的定位精度,GPS+Galileo+BDS三系统的RT PPP-AR定位误差在东、北、天方向分别为1.16 cm、0.95 cm和2.78 cm,相比未做OSB修正的浮点解PPP结果,RT PPP-AR的收敛时间可缩短40%以上;基于CNES实时OSB产品可实现BDS单系统模糊度固定,定位精度相比浮点解有显著提升,模糊度固定成功率约为94%。
Objectives
2
The observable-specific signal bias (OSB) provides a simple and unified way for phase/pseudo-range bias correction in multi-frequency and multi-constellation global navigation satellite system (GNSS) data processing. The quality of real-time OSB products directly affects the performance of real-time precise point positioning (PPP) with ambiguity resolution (RT PPP-AR). The Centre National d'Etudes Spatiales (CNES) is currently the only research institution that publicly releases real-time OSB products which promote the practical applications of multi-frequency and multi-constellation RT PPP-AR. This study evaluate and analyze the quality of real-time OSB products from CNES and their impact on RT PPP-AR solution
aiming to provide a reference for increasing RT PPP users.
Method
2
After evaluating the availability and stability of real-time OSB products from CNES
the ambiguity residual distribution situation were statistically analyzed. Simulated kinematic and static positioning experiments were carried out to verify the positioning performance of RT PPP-AR based on real-time OSB products from CNES for several different system combinations.
Results
2
Experimental results show that real-time OSB products from CNES demonstrate high availability
good stability and high accuracy. As for the availability of phase/pseudo-range OSB products for GPS/Galileo/BDS systems reaches over 90%
but for some satellites (such as G28
E02
E07
E21)
the availability ranges from 40% to 80%. The stability of GPS/Galileo phase OSB products is better than 0.1 cycles
while that of BDS is slightly lower. The daily average standard deviations (STD) for GPS/Galileo/BDS systems are 0.085
0.117
and 0.228 cycles
respectively. After applying OSB corrections
the residual ambiguity for wide-lane (WL) and narrow-lane (NL) of GPS/Galileo/BDS satellites is small
with percentages within ±0.25 cycles as follows: 92.4%
95.9%
86.6% for WL
and 88.4%
91.5%
87.4% for NL
which satisfies the requirements for ambiguity fixing in PPP. The real-time PPP-AR positioning accuracy using OSB products from CNES is validated with multi-GNSS experiment observations. The results show that RT PPP-AR using real-time OSB products from CNES can achieve centimeter-level positioning accuracy in dynamic mode. The positioning errors in the east
north
and up directions for GPS+Galileo+BDS RT PPP-AR are 1.16 cm
0.95 cm
and 2.78 cm
respectively. Compared to float PPP results without OSB correction
RT PPP-AR significantly reduces the convergence time by more than 40%.
Conclusion
2
Ambiguity resolution can be achieved under BDS single system based on real-time OSB products from CNES. And the positioning accuracy is significantly improved compared to float solution
while the fixing rate is around 94%.
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