Accounting for the differential inter-system bias (DISB) of code observation in GPS+BDS positioning
-
Xiang Cao
,
Chengfa Gao
Abstract
If the associated differential inter-system biases (DISBs) are priori known, only one common reference satellite is sufficient, which is called the inter-system model. The inter-system model can help to maximize the redundancy of the positioning model, and thus can improve the positioning performance, especially in harsh environment. However, in practice use not all receivers can be calibrated with DISBs in advance. In this paper, taking combined GPS and BDS pseudorange positioning as the example, we compare three positioning models and their positioning performance. One is traditional intra-system model, and the other two belongs to the inter-system models, i. e. the model with calibration of DISB and the model with real-time estimation of DISB parameter. Positioning performance using the three models is evaluated with simulated obstructed environments. It will be shown that besides the model with calibration of DISB, the model with real-time estimation of DISB parameter can also effectively improve positioning accuracy and reliability compared with the traditional intra-system model, especially for the severely obstructed environment with only a few satellites observed. When no more than 7 satellites visible, the positioning accuracies in each directions can be improved by no less than 15 %. The proposed model can be used alternatively when no priori DISB calibration is available.
Funding source: National Natural Science Foundation of China
Award Identifier / Grant number: 41574026
Funding source: Government of Jiangsu Province
Award Identifier / Grant number: BE2016176
Funding statement: This work is partially supported by the National Natural Science Foundation of China (Grant No. 41574026) and the Primary Research and Development Plan of Jiangsu Province (Grant No. BE2016176).
Acknowledgment
The authors gratefully acknowledge GNSS Research Centre of Curtin University for providing the multi-GNSS observation data.
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© 2019 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Research Articles
- Enhancing the predictability of least-squares collocation through the integration with least-squares-support vector machine
- Meridian convergence: An alternate methodology
- Analysing Willerding’s formula for solving the planar three point resection problem
- Contribution of satellite altimetry in modelling Moho density contrast in oceanic areas
- Estimations of GNSS receiver internal delay using precise point positioning algorithm
- Trilateration approaches for seamless out-/indoor GNSS and Wi-Fi smartphone positioning
- Accounting for the differential inter-system bias (DISB) of code observation in GPS+BDS positioning
Artikel in diesem Heft
- Frontmatter
- Research Articles
- Enhancing the predictability of least-squares collocation through the integration with least-squares-support vector machine
- Meridian convergence: An alternate methodology
- Analysing Willerding’s formula for solving the planar three point resection problem
- Contribution of satellite altimetry in modelling Moho density contrast in oceanic areas
- Estimations of GNSS receiver internal delay using precise point positioning algorithm
- Trilateration approaches for seamless out-/indoor GNSS and Wi-Fi smartphone positioning
- Accounting for the differential inter-system bias (DISB) of code observation in GPS+BDS positioning
