000195220 001__ 195220
000195220 003__ CZ-ZdVUG
000195220 005__ 20191202103225.0
000195220 041__ $$aeng
000195220 040__ $$aABC039$$bcze
000195220 1001_ $$aDouša, Jan
000195220 24510 $$aEvaluation of long-term BeiDou/GPS observation quality based on G-Nut/Anubis and initial results
000195220 300__ $$a9 stran
000195220 5203_ $$aReliable observations are the prerequisite for high-precision GNSS data processing. Data quality evaluation at the pre-processing procedure can help the user to identify the weakness of the observations. The open source software package G-Nut/Anubis developed at Geodetic Observatory Pecny (GOP) is introduced and used for the evaluation of long-term BeiDou/GPS signal. Several key indicators are selected to evaluate the BeiDou/GPS observations. Quantitative analysis shows that more than 100 stations can achieve 6-hour standalone BeiDou positioning at least. The completeness of the BeiDou phase and code observations at three frequencies is higher than that of the GPS observations in the selected station which is mainly attributed to the high elevation observations from GEO and IGSO satellites. Qualitative analysis shows that the multipath effects for pseudorange observations are correlated with signal, receiver types and firmware versions besides the station environment. Users attempting to improve the pseudorange observations by multipath filter should pay attention also to the receiver-specific settings. Cycle slip counts are used to indicate the quality of carrier-phase observations. Results show that BeiDou C05 satellite is more affected by the cycle slips, in particular the third frequency observables. The GPS third frequency obsevables are more robust compared to the legacy frequencies. Comprehensive single point positioning results show that positioning accuracy for BeiDou is worse than that of GPS, which is mainly caused by less active satellites, worse geometry and larger errors in the broadcast ephemeris. The BeiDou positioning accuracy was further degraded by the C13/C15 satellite and dominated by large clock errors. Broadcast evaluation shows that the BeiDou orbit errors are related to the constellations. Overall, the orbit precision for both GPS and BeiDou has been gradually improved. Outliers were observed for navigation records assigned with the healthy status, especially for BeiDou broadcast orbits.
000195220 655_4 $$ačlánek v odborném periodiku
000195220 7001_ $$aVáclavovic, Pavel
000195220 7001_ $$aZhao, Lewen
000195220 7001_ $$aXia, Fengyu
000195220 7001_ $$aYe, Shirong
000195220 7730_ $$92018$$dČeská republika,2018.$$g15. (1), s.77-85$$tActa Geodynynamica et Geomaterialia$$x1214-9705
000195220 8564_ $$uhttps://www.irsm.cas.cz/index.php
000195220 85642 $$ahttps://www.rvvi.cz/riv?s=rozsirene-vyhledavani&ss=detail&n=0&h=RIV%2F00025615%3A_____%2F18%3AN0000059%21RIV19-MSM-00025615
000195220 910__ $$aABC039
000195220 980__ $$aclanky_vugtk
000195220 985__ $$adousa
000195220 985__ $$ariv
000195220 985__ $$autvar24
000195220 985__ $$avaclavovic