Using external tropospheric corrections to improve GNSS positioning of hot-air balloon

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025615%3A_____%2F17%3AN0000007" target="_blank" >RIV/00025615:_____/17:N0000007 - isvavai.cz</a>

Result on the web

<a href="https://link.springer.com/article/10.1007/s10291-017-0628-3" target="_blank" >https://link.springer.com/article/10.1007/s10291-017-0628-3</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10291-017-0628-3" target="_blank" >10.1007/s10291-017-0628-3</a>

Result language

angličtina

Original language name

Using external tropospheric corrections to improve GNSS positioning of hot-air balloon

Original language description

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.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10511 - Environmental sciences (social aspects to be 5.7)

Project

—

Continuities

N - Vyzkumna aktivita podporovana z neverejnych zdroju

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

GPS SOLUTIONS

ISSN

1080-5370

e-ISSN

1521-1886

Volume of the periodical

21

Issue of the periodical within the volume

4

Country of publishing house

DE - GERMANY

Number of pages

11

Pages from-to

1479-1489

UT code for WoS article

000411901900006

EID of the result in the Scopus database

2-s2.0-85018488425