Bibliografie VÚGTK
Using external tropospheric corrections to improve GNSS positioning of hot-air balloon
Václavovic, Pavel ; Douša, Jan ; Eliaš, Michal ; Kostelecký, Jakub

Source: GPS SOLUTIONS : 21(4), str.1479-1489 ISSN: 1080-5370

Publication type: anotace
Extent11 stran

Fulltext: https://link.springer.com/article/10.1007/s10291-017-0628-3

Annotation:
High accurate global navigation satellite systems (GNSS) require to correct a signal delay caused by the troposphere. The delay can be estimated along with other unknowns or introduced from external models. We assess the impact of the recently developed augmentation tropospheric model on real-time kinematic precise point positioning (PPP). The model is based on numerical weather forecast and thus reflects the actual state of weather conditions. Using the G-Nut/Geb software, we processed GNSS and meteorological data collected during the experiment using a hot-air balloon flying up to an altitude of 2000 m. We studied the impacts of random walk noise setting of zenith total delay (ZTD) on estimated parameters and the mutual correlations, the use of external tropospheric corrections, the use of data from a single or dual GNSS constellation and the use of Kalman filter and backward smoothing processing methods. We observed a significant negative correlation of the estimated rover height and ZTD which depends on constraining ZTD estimates. Such correlation caused a degraded performance of both parameters when estimated simultaneously, in particular for a single GNSS constellation. The impact of ZTD constraining reached up to 50-cm differences in the rover height. Introducing external tropospheric corrections improved the PPP solution regarding: (1) shortened convergence, (2) better overall robustness, particularly, in case of degraded satellite geometry, (3) less adjusted parameters with lower correlations. The numerical weather model-driven PPP resulted in 9-12- and 5-6-cm uncertainties in the rover altitude using the Kalman filter and the backward smoothing, respectively. Compared to standard PPP, it indicates better performance by a factor of 1-2 depending on the availability of GNSS constellations, the troposphere constraining and the processing strategy.
Keywords: GNSS ; Tropospheric corrections ; Zenith total delay ; Numerical weather forecast ; Precise point positioning ; Kinematic positioning

[Odkaz do RIVu]

The record appears in these collections:
Focus on VÚGTK > Staff VÚGTK > Jakub Kostelecký
Focus on VÚGTK > Staff VÚGTK > Pavel Václavovic
Focus on VÚGTK > Staff VÚGTK > Michal Eliaš
Focus on VÚGTK > Staff VÚGTK > Jan Douša
Documents of VÚGTK > Articles VÚGTK
Focus on VÚGTK > RIV
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 Record created 2018-07-13, last modified 2018-11-27



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