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TitleOn the interoperability of GNSS clock and bias products for precise point positioning with ambiguity resolution
AuthorBanville, SORCID logo
SourceWorkshop on the Applications of Global Navigation Satellite Systems; 2019 p. 1-18 Open Access logo Open Access
LinksOnline - En ligne (PDF, 2 MB)
LinksAbstract - Résumé (complete volume - volume complet, PDF, 688 KB)
Alt SeriesNatural Resources Canada, Contribution Series 20190110
PublisherUnited Nations Office for Outer Space Affairs
MeetingUnited Nations Workshop on the Applications of Global Navigation Satellite Systems; Suva; FJ; June 24-28, 2019
DocumentWeb site
Mediapaper; on-line; digital
File formatpdf (Adobe® Reader®)
Subjectsgeophysics; Science and Technology; geodesy; satellite geodesy; navigation satellites; models; Geographic data; Global positioning systems; global navigation satellite systems (GNSS)
Illustrationsschematic representations; time series; models; flow diagrams; bar graphs
ProgramGeodetic Survey Canadian Spatial Reference System
Released2019 06 01
AbstractThe technique of precise point positioning (PPP) enables global centimeter-level positioning by providing precise GNSS satellite orbit and clock corrections to users. Adding an additional layer of corrections in the form of code and phase biases allows for a faster convergence of the solution thanks to ambiguity resolution (PPP-AR). In a near future, several sources of corrections will be available to users in real time from regional augmentation services and even from GNSS satellites. While multiple sources of corrections are clearly beneficial, how users should handle this redundancy is not obvious. Switching from one provider to another implies either a discontinuity in user position or sophisticated algorithms for the alignment of correction streams. To gain more insights into this issue, the International GNSS Service (IGS) has initiated a new working group (WG) on PPP-AR. An initial study performed by the WG has shown that, even though analysis centers disseminate satellite clock and bias corrections having different interpretations, a transformation to a common observable-specific signal bias (OSB) representation can be defined to ensure interoperability. However, providing OSBs is not a sufficient condition for interoperability. Once interoperable corrections are available, the next step consists of obtaining consistent corrections by adopting standard models and conventions. Since there is no convention defining satellite attitude, this information should be disseminated to users to minimize modeling discrepancies, especially during satellite eclipses.
Summary(Plain Language Summary, not published)
NRCan provides GPS solutions that enable clients to obtain consistent cm-level positioning in the Canadian Spatial Reference System. These accurate positions are derived using precise satellite orbit and clock products. To increase the robustness of these products, the International GNSS Service (IGS) produces combined products from the solutions of several international analysis centers, including NRCan. This presentation highlights interoperability issues that must be addressed to enable a modernized combination of these products.

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