000196397 001__ 196397
000196397 003__ CZ-ZdVUG
000196397 005__ 20220607110839.0
000196397 041__ $$aeng
000196397 040__ $$aABC039$$bcze
000196397 1001_ $$aDouša, Jan
000196397 24510 $$aAccuracy evaluation of ionospheric delay from multi-scale reference networks and its application for fast PPP ambiguity resolution
000196397 300__ $$a12 stran
000196397 5203_ $$aThe Precise Point Positioning (PPP) can achieve a fast ambiguity resolution (PPP-RTK) when augmented with precise ionospheric delays derived from regional GNSS networks. In this study, the accuracy of the ionospheric delay derived from multi-scale networks are assessed and used for the GPS and Galileo PPP-RTK demonstration. First, the convergence time of the GPS-only PPP are evaluated based on the GFZ final and CNES real-time products. Results indicated that an average convergence time of 30 min and 20 min is needed for the CNES and GFZ float solutions, respectively, in order to achieve a decimetre level horizontal position accuracy. After applying the ambiguity resolution method, 20% and 35% improvements are observed reaching 24min and 13min, respectively. Then, the accuracy of ionospheric delays derived from the ambiguity-fixed PPP and the CODE global products are assessed. A short-baseline comparison indicated that the mean bias and standard deviation of the derived multi-day ionospheric errors are within 0.15 TECU and 0.06 TECU, respectively, with a presence of a daily periodic term. The accuracy of the interpolated ionospheric delay from global models are more related to the location of the stations, ranging from 1 TECU to 3 TECU. Finally, precise ionospheric delays derived from the EUREF permanent network with the inter-station distance larger than 73 km are selected for ionospheric modelling at the user location. Results indicated that the PPP ambiguity resolution can be achieved within a minute. After enlarging the inter-station distance to 209 km, ambiguity resolution can be achieved within several epochs with improved fixing rate as well.
000196397 6112_ $$aSymposium GIS Ostrava 2021 Advances in Localization and Navigation$$cOstrava$$d17.3.2021
000196397 655_4 $$asbornikove prispevky
000196397 7001_ $$aVáclavovic, Pavel
000196397 7001_ $$aZhao, Lewen
000196397 7730_ $$92021$$dOstrava:Vysoká škola Báňská-Technická univerzita Ostrava,2021.$$g12 stran$$tSymposium GIS Ostrava 2021 Advances in Localization and Navigation$$x1213-239X$$z978-80-248-4505-0
000196397 8564_ $$uhttps://doi.org/10.31490/9788024845050-14
000196397 85642 $$ahttps://www.isvavai.cz/riv?s=rozsirene-vyhledavani&ss=detail&n=0&h=RIV%2F00025615%3A_____%2F21%3AN0000040%21RIV22-MSM-00025615
000196397 910__ $$aABC039
000196397 980__ $$aclanky_vugtk
000196397 985__ $$adousa
000196397 985__ $$ariv
000196397 985__ $$autvar24
000196397 985__ $$avaclavovic