Bibliografie VÚGTK
Inclusion of GPS clock estimates for satellites Sentinel-3A/3B in DORIS geodetic solutions
Filler, Vratislav ; Štěpánek, Petr

Source: Journal of Geodesy : 94. (12), 20 s. ISSN: 0949-7714

Publication type: článek v časopise
Extent20 stran

Link: https://link.springer.com/article/10.1007/s00190-020-01428-x
Annotation:
A 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.

Citation: PETR, Štěpánek a Vratislav FILLER. Inclusion of GPS clock estimates for satellites Sentinel-3A/3B in DORIS geodetic solutions. Journal of Geodesy [online]. 2020, 94(12), 20 s. [cit. 2021-08-03]. ISSN 0949-7714. Dostupné z: doi:10.1007/s00190-020-01428-x

The record appears in these collections:
Focus on VÚGTK > VÚGTK Departments > Geodesy and Geodynamics
Focus on VÚGTK > Researchers > Petr Štěpánek
Focus on VÚGTK > Researchers > Vratislav Filler
Documents of VÚGTK > Articles VÚGTK
Focus on VÚGTK > RIV