000193036 001__ 193036
000193036 003__ CZ-ZdVUG
000193036 005__ 20190130105712.0
000193036 044__ $$axxu
000193036 041__ $$aeng
000193036 040__ $$aABC039$$bcze
000193036 1001_ $$aAhmed, F.
000193036 24510 $$aComparative analysis of real-time precise point positioning zenith total delay estimates
000193036 300__ $$a13 stran
000193036 500__ $$aThis article is published with open access at Springerlink.com
000193036 5203_ $$9eng$$aThe continuous evolution of global navigation satellite systems (GNSS) meteorology has led to an increased use of associated observations for operational modern low-latency numerical weather prediction (NWP) models, which assimilate GNSS-derived zenith total delay (ZTD) estimates. The development of NWP models with faster assimilation cycles, e.g., 1-h assimilation cycle in the rapid update cycle NWP model, has increased the interest of the meteorological community toward sub-hour ZTD estimates. The suitability of real-time ZTD estimates obtained from three different precise point positioning software packages has been assessed by comparing them with the state-of-the-art IGS final troposphere product as well as collocated radiosonde (RS) observations. The ZTD estimates obtained by BNC2.7 show a mean bias of 0.21 cm, and those obtained by the G-Nut/Tefnut software library show a mean bias of 1.09 cm to the IGS final troposphere product. In comparison with the RS-based ZTD, the BNC2.7 solutions show mean biases between 1 and 2 cm, whereas the G-Nut/Tefnut solutions show mean biases between 2 and 3 cm with the RS-based ZTD, and the ambiguity float and ambiguity fixed solutions obtained by PPP-Wizard have mean biases between 6 and 7 cm with the references. The large biases in the time series from PPP-Wizard are due to the fact that this software has been developed for kinematic applications and hence does not apply receiver antenna eccentricity and phase center offset (PCO) corrections on the observations. Application of the eccentricity and PCO corrections to the a priori coordinates has resulted in a 66 % reduction of bias in the PPP-Wizard solutions. The biases are found to be stable over the whole period of the comparison, which are criteria (rather than the magnitude of the bias) for the suitability of ZTD estimates for use in NWP nowcasting. A millimeter-level impact on the ZTD estimates has also been observed in relation to ambiguity resolution. As a result of a comparison with the established user requirements for NWP nowcasting, it was found that both the G-Nut/Tefnut solutions and one of the BNC2.7 solutions meet the threshold requirements, whereas one of the BNC2.7 solution and both the PPPWizard solutions currently exceed this threshold.
000193036 655_4 $$aanotace
000193036 653_0 $$aambiguity resolution$$aprecise point positioning$$aZenith total delay$$areal time$$aGNSS$$aGPS
000193036 7001_ $$aVáclavovic, P.
000193036 7001_ $$aTeferle, F.N.
000193036 7001_ $$aDouša, J.
000193036 7001_ $$aBingley, R.
000193036 7001_ $$aLaurichesse, D.
000193036 7730_ $$92016$$g(2016) 20:187–199$$tGPS Solutions$$x1080-5370
000193036 856__ $$uurn:doi:10.1007/s10291-014-0427-z
000193036 85641 $$uhttps://link.springer.com/article/10.1007/s10291-014-0427-z/fulltext.html$$yOnline verze
000193036 8564_ $$uhttp://knihovna.vugtk.cz/record/193036/files/y2016-vaclavovic-dousa-comparative-.pdf
000193036 85642 $$uhttps://www.rvvi.cz/riv?s=jednoduche-vyhledavani&ss=detail&n=0&h=RIV%2F00025615%3A_____%2F15%3A%230002209%21RIV16-GA0-00025615
000193036 910__ $$aABC039$$b49533
000193036 980__ $$aclanky_vugtk
000193036 985__ $$ariv
000193036 985__ $$aanotace
000193036 985__ $$adousa
000193036 985__ $$avaclavovic
000193036 985__ $$autvar24
000193036 999C1 $$9CURATOR$$aGAP209/12/2207 - Rozvoj analýz využívajících data z Globálních polohových systémů pro monitorování troposféry (2012 - 2015)$$bGAČR GA
000193036 999C1 $$9CURATOR$$aLD14102 - Rozvoj pokročilých metod zpracování GNSS observací v synergii s meteorologickými a klimatickými daty (2014 - 2017)$$bMŠMT LD