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TitleGLONASS ionosphere-free ambiguity resolution for precise point positioning
AuthorBanville, S
SourceJournal of Geodesy vol. 90, issue 5, 2016 p. 487-496, https://doi.org/10.1007/s00190-016-0888-7
Year2016
Alt SeriesEarth Sciences Sector, Contribution Series 20150361
PublisherSpringer Nature
Documentserial
Lang.English
Mediapaper; on-line; digital
File formatpdf
ProvinceBritish Columbia; Alberta; Saskatchewan; Manitoba; Ontario; Quebec; New Brunswick; Nova Scotia; Prince Edward Island; Newfoundland and Labrador; Northwest Territories; Yukon; Nunavut
NTS1; 2; 3; 10; 11; 12; 13; 14; 15; 16; 20; 21; 22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 32; 33; 34; 35; 36; 37; 38; 39; 40; 41; 42; 43; 44; 45; 46; 47; 48; 49; 52; 53; 54; 55; 56; 57; 58; 59; 62; 63; 64; 65; 66; 67; 68; 69; 72; 73; 74; 75; 76; 77; 78; 79; 82; 83; 84; 85; 86; 87; 88; 89; 92; 93; 94; 95; 96; 97; 98; 99; 102; 103; 104; 105; 106; 107; 114O; 114P; 115; 116; 117; 120; 340; 560
Lat/Long WENS-141.0000 -50.0000 90.0000 41.7500
Subjectsgeophysics; remote sensing; satellites; GLONASS; GLONASS; global navigation satellite systems (GNSS)
Illustrationslocation maps; graphs; histograms; tables
ProgramCanadian Spatial Reference System, Geodetic Survey
Released2016 02 08
AbstractCurrent GLONASS satellites transmit signals based on the frequency division multiple access (FDMA) technology. Due to frequency-dependent equipment delays occurring within GNSS receivers, GLONASS carrier-phase and code observations are contaminated by inter-frequency biases. As a consequence, GLONASS ambiguity parameters in long-baseline processing are typically estimated as float values. In this paper, a strategy is investigated which benefits from the frequency spacing of GLONASS frequencies on the L1 and L2 bands, allowing for an ionosphere-free ambiguity with a wavelength of approximately 5 cm to be defined, therefore avoiding the problematic widelane ambiguity resolution. Based on 12 independent baselines with a mean inter-station distance of about 850 km over a one-week period, it is demonstrated that close to 95% of the estimated double-differenced ionosphere-free ambiguities are within 0.15 cycles of an integer, thereby suggesting that long-baseline ambiguity resolution can be achieved for GLONASS. Applying between-station ambiguity constraints in precise point positioning (PPP) solutions was found to improve longitudinal repeatability in static mode by approximately 20% for sessions between 2 to 6 hours in duration. In kinematic mode, only limited improvements were made since the short wavelength of GLONASS ionosphere-free ambiguities requires the solution to be nearly converged before successful ambiguity resolution can be achieved.
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. Clients will benefit from the addition of GLONASS and Galileo constellations through increased reliability and improved accuracy. However, use of different satellite constellations and receiver types presents many signal processing challenges to ensure full consistency and realize the cumulative benefits of these systems. Signal biases are a notable concern for the GLONASS constellation and careful treatment is necessary. This investigation reports on a novel method to mitigate the impacts of such biases, resulting in simplified processing of data from mixed receiver types and firmware versions.
GEOSCAN ID297456