Wang Gao
Combined GPS and BDS for single-frequency continuous RTK positioning through real-time estimation of differential inter-system biases
Gao, Wang; Meng, Xiaolin; Gao, Chengfa; Pan, Shuguo; Wang, Denghui
Authors
Xiaolin Meng
Chengfa Gao
Shuguo Pan
Denghui Wang
Abstract
Double-differenced (DD) ambiguities between overlapping frequencies from different GNSS constellations can be fixed to integers if the associated differential inter-system biases (DISBs) are well known. In this case, only one common pivot satellite is sufficient for inter-system ambiguity resolution. This will be beneficial to ambiguity resolution (AR) and real-time kinematic (RTK) positioning especially when only a few satellites are observed. However, for GPS and current operational BDS-2, there are no overlapping frequencies. Due to the influence of different frequencies, the inter-system DD ambiguities still cannot be fixed to integers even if the DISBs are precisely known. In this contribution, we present an inter-system differencing model for combined GPS and BDS single-frequency RTK positioning through real-time estimation of DISBs. The stability of GPS L1 and BDS B1 DISBs is analyzed with different receiver types. Along with parameterization and using the short-term stability of DISBs, the DD ambiguities between GPS and BDS pivot satellites and the between-receiver single-difference ambiguity of the GPS pivot satellite can be estimable jointly with the differential phase DISB term from epoch to epoch. Then the inter-system differencing model can benefit from the near time-constant DISB parameters and thus has better multi-epoch positioning performance than the classical intra-system differencing model. The combined GPS and BDS single-frequency RTK positioning performance is evaluated with various simulated satellite visibilities. It will be shown that compared with the classical intra-system differencing model, the proposed model can effectively improve the positioning accuracy and reliability, especially for severely obstructed situations with only a few satellites observed.
Citation
Gao, W., Meng, X., Gao, C., Pan, S., & Wang, D. (2018). Combined GPS and BDS for single-frequency continuous RTK positioning through real-time estimation of differential inter-system biases. GPS Solutions, 22(1), https://doi.org/10.1007/s10291-017-0687-5
Journal Article Type | Article |
---|---|
Acceptance Date | Nov 16, 2017 |
Online Publication Date | Nov 21, 2017 |
Publication Date | 2018-01 |
Deposit Date | Jan 26, 2019 |
Journal | GPS Solutions |
Print ISSN | 1080-5370 |
Electronic ISSN | 1521-1886 |
Publisher | Springer Verlag |
Peer Reviewed | Peer Reviewed |
Volume | 22 |
Issue | 1 |
DOI | https://doi.org/10.1007/s10291-017-0687-5 |
Public URL | https://nottingham-repository.worktribe.com/output/1498376 |
Publisher URL | https://link.springer.com/article/10.1007%2Fs10291-017-0687-5 |
Additional Information | This is a post-peer-review, pre-copyedit version of an article published in GPS Solutions. The final authenticated version is available online at: http://dx.doi.org/10.1007/s10291-017-0687-5 |
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