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TitleWide-area grid-based slant ionospheric delay corrections for precise point positioning
AuthorBanville, SORCID logo; Hassen, E; Walker, M; Bond, J
SourceRemote Sensing vol. 14, 5, 1073, 2022 p. 1-22, Open Access logo Open Access
Alt SeriesNatural Resources Canada, Contribution Series 20210491
Mediapaper; digital; on-line
File formatpdf
ProvinceQuebec; Ontario
NTS21E; 21L; 21M; 30N; 31B; 31C; 31F; 31G; 31H; 31I; 31J; 31K; 31N; 31O; 31P
AreaUnited States of America
Lat/Long WENS -78.0000 -70.0000 48.0000 43.5000
SubjectsScience and Technology; satellites; ionosphere; global navigation satellite systems (GNSS)
Illustrationslocation maps; figures; variation diagrams; plots
ProgramGeodetic Survey Canadian Spatial Reference System
Released2022 02 22
AbstractIntroducing ionospheric information into a precise point positioning (PPP) solution enables faster ambiguity resolution and significantly improves positioning accuracy. To compute such corrections over wide areas, sparse networks with potentially irregular station distributions are often used. This aspect brings a new level of complexity as ionospheric corrections should be weighted appropriately in the PPP filter. This paper presents a possible implementation of grid-based widearea slant ionospheric delay corrections, with a focus on the reported uncertainties. A balance is obtained between obtaining corrections with formal errors small enough to enable fast convergence, while large enough to overbound most errors. Based on least-squares collocation, the method uses satellite-specific variograms based on the 99th percentile values in each distance bin. Tested in southern Canada over a 53-week period in 2020, ionospheric grids allowed dual-frequency receivers to obtain around 5 cm accuracy in each horizontal component within 5 min of static data collection. For single-frequency solutions using data from geodetic receivers, positioning errors were reduced by over 60% for both static and kinematic processing.
Summary(Plain Language Summary, not published)
NRCan provides global navigation satellite systems (GNSS) products that enable clients to obtain accurate positioning in the Canadian Spatial Reference System. To improve access to the reference frame, precise ionospheric corrections can be provided to users, reducing the time to reach cm-level accuracies from over 15 minutes to less than 5 minutes. This paper describes the methodology implemented at NRCan to generate these precise ionospheric corrections.

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