| Title | Wide-area grid-based slant ionospheric delay corrections for precise point positioning |
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| Author | Banville, S ;
Hassen, E; Walker, M; Bond, J |
| Source | Remote Sensing vol. 14, 5, 1073, 2022 p. 1-22, https://doi.org/10.3390/rs14051073  Open Access |
| Image |  |
| Year | 2022 |
| Alt Series | Natural Resources Canada, Contribution Series 20210491 |
| Publisher | MDPI |
| Document | serial |
| Lang. | English |
| Media | paper; digital; on-line |
| File format | pdf |
| Province | Quebec; Ontario |
| NTS | 21E; 21L; 21M; 30N; 31B; 31C; 31F; 31G; 31H; 31I; 31J; 31K; 31N; 31O; 31P |
| Area | United States of America |
| Lat/Long WENS | -78.0000 -70.0000 48.0000 43.5000 |
| Subjects | Science and Technology; satellites; ionosphere; global navigation satellite systems (GNSS) |
| Illustrations | location maps; figures; variation diagrams; plots |
| Program | Geodetic Survey Canadian
Spatial Reference System |
| Released | 2022 02 22 |
| Abstract | Introducing 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. |
| GEOSCAN ID | 329350 |
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