000196318 001__ 196318
000196318 003__ CZ-ZdVUG
000196318 005__ 20210823112147.0
000196318 041__ $$aeng
000196318 040__ $$aABC039$$bcze
000196318 1001_ $$aFiller, Vratislav
000196318 24510 $$aInclusion of GPS clock estimates for satellites Sentinel-3A/3B in DORIS geodetic solutions
000196318 300__ $$a20 stran
000196318 5203_ $$aA unique architecture of Sentinel-3A and Sentinel-3B satellites includes the shared ultra-stable oscillator (USO) by the DORIS and GPS receivers. This concept enables to apply onboard GPS clock estimates in the DORIS processing substituting the DORIS polynomial clock model by the GPS epoch-wise model, together with a DORIS-specific clock offset. Such an approach is particularly profitable for the mitigation of the South Atlantic Anomaly (SAA) effect affecting the short-term frequency stability of the USO oscillator in the South America and South Atlantic region. The GPS clock behavior precisely maps the SAA effect and enables us to demonstrate a difference of the USO sensitivity to the SAA for Sentinel-3A and Sentinel-3B. We present world grid maps of clock time derivatives for both Sentinels, displaying a different sign of the direct effect and other differences in the USO memory/recovery effect. Moreover, we present the impact of SAA on 3D positioning where the largest SAA-related bias reaches several centimeters. We also determine an effect of the precise clock modeling on the Earth rotation parameter estimates. In addition to these improvements, the elimination of the SAA effect gives us an opportunity to get an almost SAA-free DORIS solution from Sentinel-3A and Sentinel-3B satellites. Using the combined solution of both Sentinels as a reference, we estimate the SAA effect on the DORIS beacon positions also for satellites Jason-2, Jason-3, Saral, Cryosat-2 and Hy-2A and find significant positioning biases for all the recent satellites except Saral.
000196318 655_4 $$ačlánek v časopise
000196318 7001_ $$aŠtěpánek, Petr
000196318 7730_ $$92020$$dSpolková republika Německo,2020.$$g94. (12), 20 s.$$tJournal of Geodesy$$x0949-7714
000196318 8564_ $$uhttps://link.springer.com/article/10.1007/s00190-020-01428-x
000196318 85642 $$ahttps://www.isvavai.cz/riv?s=rozsirene-vyhledavani&ss=detail&n=0&h=RIV%2F00025615%3A_____%2F20%3AN0000064%21RIV21-MSM-00025615
000196318 910__ $$aABC039
000196318 980__ $$aclanky_vugtk
000196318 985__ $$afiller
000196318 985__ $$ariv
000196318 985__ $$autvar24
000196318 985__ $$astepanek