000193229 001__ 193229
000193229 003__ CZ-ZdVUG
000193229 005__ 20190311110931.0
000193229 041__ $$aeng
000193229 040__ $$aABC039$$bcze
000193229 1001_ $$aŠtěpánek, Petr
000193229 24510 $$aGravity field and ocean tides modeling for precise orbit determination of DORIS satellites
000193229 300__ $$a14 stran
000193229 5203_ $$9eng$$aGravitational forces are the major sources of perturbing accelerations acting on satellites in low Earth orbits. Recently, the modeling of the global Earth gravity field strongly benefited from the satellite gravity missions CHAMP, GRACE and GOCE. Besides the static gravity models also the time-variable models are now available, including the seasonal and linear (or piecewise linear) terms. We focus on the gravity modeling for precise orbit determination (POD) using DORIS (Doppler Orbitography and Radiopositionning Integrated by Satellite) data. First we show the relative effect of various gravitational and non-gravitational perturbation forces on orbits of Earth artificial satellites at several different altitudes (460–5900 km; satellites Swarm A, SPOT-5, Jason-2, Lageos-1). Then we study the impact of a particular setting (maximum degree, time-variable terms) of gravity field and ocean tide models on the quality of the determined orbits. For DORIS satellites SPOT-5 and Jason-2, we optimized the geopotentical coefficient truncation degree to meet the limit of 1 mm radial orbit error and 2 mm cross-track and along-track orbit error. A minimum limit for the geopotential coefficient truncation degree is 75 for SPOT-5 and 50 for Jason-2, when using the common dynamic orbit settings and daily orbit arc. The minimum limit for the application of the gravity changes due to the ocean tides is 25 for SPOT-5 and 20 for Jason-2. However, we also demonstrate that these limits depend on an orbit parametrization. Our experiments with SPOT-5 and Cryosat POD show a significant impact of the piecewise linear modeling, applied in the time-varying part of the gravity field model EIGEN-6S2, indicated by the effect on the RMS of the orbit fit. A similar effect of the annual and semiannual gravity terms application on the RMS of the orbit fit was not found, but the arc overlap RMS decreased by 0.6-2%.
000193229 655_4 $$aanotace
000193229 653_0 $$atime variable gravity$$aPOD$$aocean tides$$agravity field truncation degree$$aDORIS
000193229 7001_ $$aBezděk, Aleš
000193229 7001_ $$aKostelecký, Jan
000193229 7001_ $$aFiller, Vratislav
000193229 7730_ $$92016$$g13(1), p. 27-40$$tActa Geodynamica et Geomaterialia$$x1214-9705
000193229 856__ $$uurn:doi:10.13168/AGG.2015.0048
000193229 85642 $$uhttps://www.rvvi.cz/riv?s=rozsirene-vyhledavani&ss=detail&n=0&h=RIV%2F00025615%3A_____%2F16%3AN0000053%21RIV17-GA0-00025615
000193229 910__ $$aABC039$$b49273
000193229 980__ $$aclanky_vugtk
000193229 985__ $$akosteleckyjan
000193229 985__ $$aanotace
000193229 985__ $$ariv
000193229 985__ $$afiller
000193229 985__ $$astepanek
000193229 999C1 $$9CURATOR$$aGC15-24730J - Zdokonalení analýzy dat systému DORIS a kombinace s dalšími technikami kosmické geodézie (2015 - 2017)