Analysis of spatial–temporal characteristics for BDS-3 broadcast ionospheric models (BDS Klobuchar and BDGIM) in multi-GNSS real-time single-frequency precise point positioning

Wang, Ahao; Zhang, Yize; Chen, Junping; Li, Shijie; Zhang, Zehao; Wang, Hu

doi:10.1016/j.measurement.2023.113958

Cited by 2 publications

(2 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The satellite DCB can be corrected using the code bias products of CNES SSR in real-time. The weight of observations for different satellites is set using the elevation-dependent weighting model, and the priori precision of code and phase observations are set to 0.3 and 0.003 m, respectively [8]. Considering the lower accuracy of SSR orbits and clocks for BDS-3 inclined geosynchronous orbit (IGSO) satellites (i.e., C38-40), the weight of IGSO observations needs to be set as 1/2 of other medium earth orbit (MEO) satellites [23].…”

Section: Processing Strategiesmentioning

confidence: 99%

“…To achieve low-cost and high-precision SF positioning, many kinds of broadcast or post-processing ionospheric models have been proposed so far. Although the GPS Klobuchar model, BeiDou global broadcast ionospheric delay correction model (BDGIM), and Galileo NeQuick model can be applied to real-time (RT) SF positioning, their ionospheric correction capabilities are limited and no more than 80% [5][6][7][8]. The post-processed global ionospheric map (GIM), as one of the most accurate ionospheric models, can provide correction accuracy within two total electron content units (TECU), but it cannot support RT positioning [9].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Regional Real-Time between-Satellite Single-Differenced Ionospheric Model Establishing by Multi-GNSS Single-Frequency Observations: Performance Evaluation and PPP Augmentation

Wang,

Zhang,

Chen

et al. 2024

Remote Sensing

Self Cite

View full text Add to dashboard Cite

The multi-global navigation satellite system (GNSS) undifferenced and uncombined precise point positioning (UU-PPP), as a high-precision ionospheric observables extraction technology superior to the traditional carrier-to-code leveling (CCL) method, has received increasing attention. In previous research, only dual-frequency (DF) or multi-frequency (MF) observations are used to extract slant ionospheric delay with the UU-PPP. To reduce the cost of ionospheric modeling, the feasibility of extracting ionospheric observables from the multi-GNSS single-frequency (SF) UU-PPP was investigated in this study. Meanwhile, the between-satellite single-differenced (SD) method was applied to remove the effects of the receiver differential code bias (DCB) with short-term time-varying characteristics in regional ionospheric modeling. In the assessment of the regional real-time (RT) between-satellite SD ionospheric model, the internal accord accuracy of the SD ionospheric delay can be better than 0.5 TECU, and its external accord accuracy within 1.0 TECU is significantly superior to three global RT ionospheric models. With the introduction of the proposed SD ionospheric model into the multi-GNSS kinematic RT SF-PPP, the initialization speed of vertical positioning errors can be improved by 21.3% in comparison with the GRAPHIC (GRoup And PHase Ionospheric Correction) SF-PPP model. After reinitialization, both horizontal and vertical positioning errors of the SD ionospheric constrained (IC) SF-PPP can be maintained within 0.2 m. This proves that the proposed SDIC SF-PPP model can enhance the continuity and stability of kinematic positioning in the case of some GNSS signals missing or blocked. Compared with the GRAPHIC SF-PPP, the horizontal positioning accuracy of the SDIC SF-PPP in kinematic mode can be improved by 37.9%, but its vertical positioning accuracy may be decreased. Overall, the 3D positioning accuracy of the SD ionospheric-constrained RT SF-PPP can be better than 0.3 m.

show abstract

Section: Processing Strategiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Regional Real-Time between-Satellite Single-Differenced Ionospheric Model Establishing by Multi-GNSS Single-Frequency Observations: Performance Evaluation and PPP Augmentation

Wang,

Zhang,

Chen

et al. 2024

Remote Sensing

Self Cite

View full text Add to dashboard Cite

show abstract

Improving the performance of BDS single-frequency precise point positioning by integrating QZSS observations in the Asia-Pacific region

Wang,

Li,

Zhang

et al. 2024

Earth Planets Space

View full text Add to dashboard Cite

Japan’s Quasi-Zenith Satellite System (QZSS) as an important supplement to the Global Navigation Satellite System (GNSS) can provide great positioning, navigation and timing (PNT) services in the Asia-Pacific region. Many researches related to QZSS have focused on dual-/multi-frequency precise point positioning (PPP) or real-time kinematic (RTK) technology with high user costs. In this study, the contribution of QZSS to BDS-3/2 single-frequency (SF) PPP is investigated for the first time. Experimental results show that the three-dimensional (3D) positioning accuracy of the BDS-3-only and BDS-3 + 2 ionosphere-corrected (IC) SF-PPP through QZSS enhancement can be improved by 9.3% and 1.7% to 0.883 and 0.852 m, respectively. In the ionosphere-free (IF) SF-PPP, with the introduction of QZSS, the convergence time of the BDS-3-only or BDS-3 + 2 solutions can be improved by at least 21% and 8.2% in the horizontal and vertical directions, respectively. After convergence, the positioning accuracy of the BDS-3-only and BDS-3 + 2 IF SF-PPP can be improved by about 10% to 0.15 m in horizontal and 0.25 m in vertical. Compared to the IF SF-PPP, the convergence time of the ionosphere-weighted (IW) SF-PPP in the BDS-3-only and BDS-3 + 2 solutions can be improved by at least 57.6% to 13.5 min in horizontal and no more than 23% to 35.0 min in vertical. In this case of rapid convergence, it is hard to further optimize the convergence time of the BDS-3/2 IW SF-PPP by integrating the QZSS. Similar phenomena also appeared in the positioning accuracy of the IW SF-PPP. Nowadays, the 3D positioning accuracy of both IF and IW SF-PPP using BDS-3/2 + QZSS observations can reach 0.3 m in the Asia-Pacific region. Graphical abstract

show abstract

Analysis of spatial–temporal characteristics for BDS-3 broadcast ionospheric models (BDS Klobuchar and BDGIM) in multi-GNSS real-time single-frequency precise point positioning

Cited by 2 publications

References 24 publications

Regional Real-Time between-Satellite Single-Differenced Ionospheric Model Establishing by Multi-GNSS Single-Frequency Observations: Performance Evaluation and PPP Augmentation

Regional Real-Time between-Satellite Single-Differenced Ionospheric Model Establishing by Multi-GNSS Single-Frequency Observations: Performance Evaluation and PPP Augmentation

Improving the performance of BDS single-frequency precise point positioning by integrating QZSS observations in the Asia-Pacific region

Contact Info

Product

Resources

About