Quality Analysis of Multi-GNSS OSB Products from CNES and Its Performance Evaluation of Real-Time Precise Point Positioning

XU Guozhen; REN Xiaodong; ZHANG Xiaohong

doi:10.13203/j.whugis20230376

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Quality Analysis of Multi-GNSS OSB Products from CNES and Its Performance Evaluation of Real-Time Precise Point Positioning

Geodesy and Survey Engineering | 更新时间：2026-11-05

- Quality Analysis of Multi-GNSS OSB Products from CNES and Its Performance Evaluation of Real-Time Precise Point Positioning
- Geomatics and Information Science of Wuhan University Vol. 50, Issue 11, Pages: 2352-2364(2025)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：10.13203/j.whugis20230376
  CLC： P228
- Received：18 June 2024，
  
  Published：05 November 2025
- 稿件说明：
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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

摘要

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%。

Abstract

Objectives

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

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

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

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%.

关键词

Keywords

references

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