boundary="_000_2D03E0AC5E817B4A8A7D170985576038D381B5DB3PRD0104MB167eu_" ****************************************************************************** dorismail 13-Dec-2011 17:10:47 Message No 0780 ****************************************************************************** Author: "Ziebart, Marek" Subject: Orbit dynamics session at the EGU, Vienna 2012 With apologies for cross posting, please consider submitting an abstract fo= r the following session at the European Geosciences Union General Assembly,= Vienna, 2012: EGU General Assembly -- Vienna, Austria, 22 - 27 April 2012 http://meetings.copernicus.org/egu2012/ Submit an abstract via this link: http://meetingorganizer.copernicus.org/EGU2012/session/9724 G2.4 Space vehicle dynamics as applied to precise orbit determination and valida= tion: pushing the edge of the envelope Convener: Marek Ziebart Co-Convener: Urs Hugentobler Abstract Submission Convener Login The accuracy of satellite precise orbit determination underpins fundamental= ly many applications of geodesy to earth and other planetary science. Our c= urrent principal challenge is to determine orbits at the centimetre, or eve= n sub-centimetre, level. New constellations of GNSS are being launched offe= ring new technical hurdles and opportunities; improved gravity field models= are available through the extended analysis of GRACE data and new LEO posi= tion-critical missions (e.g. Jason-2, GOCE, CRYOSAT-2) are currently on orb= it. Reprocessing campaigns and improved observable modelling offer outstand= ing experimental data to test approaches to orbit determination. However, t= ime series analysis of estimated tracking station coordinates indicates sig= nificant energy in observable residuals at draconitic and beta-prime (solar= ) related periods. Modelling of satellite surface forces is still problemat= ic. Many issues need to be explored by the community but at the same time w= e have strong indication of emerging techniques and models that stand to im= prove orbit determination against a range of metrics. In particular we encourage contributions to the session that make accessibl= e the technical challenges of orbit determination and modelling to the wide= r community, quantifying the nature of the impact of dynamics errors on geo= detic parameters and the terrestrial reference frame. This session solicits contributions in the following areas: (1) precise orb= it determination and validation; (2) impacts of new gravity field models on= orbit determination; (3) satellite surface force modelling; (4) advances i= n modelling atmospheric density and in atmospheric gravity; (5) advances in= modelling earth radiation fluxes and their interaction with space vehicles= ; (6) analysis of changes in geodetic parameters/earth models resulting fro= m improved force modelling/orbit determination methods; (7) relevant improv= ements in observable modelling for all tracking systems, e.g. SLR, DORIS, G= NSS and their impact upon orbit determination; (8) the impact of improved c= lock modelling methods/space clocks on precise orbit determination; (9) adv= ances in understanding and modelling satellite attitude behaviour; (10) orb= it determination for other solar system missions; (11) insights into GPS lo= ng term orbit behaviour through the IGS re-processing campaigns; (12) insig= hts into LEO long term orbit behaviour through the Jason/TOPEX reprocessing= campaigns We look forward to seeing you in Vienna, Marek and Urs Marek Ziebart Professor of Space Geodesy Director, Space Geodesy and Navigation Laboratory Vice Dean for Research, Faculty of Engineering Sciences University College London, Department of Civil, Environmental and Geomatic Engineering Gower Street, L= ondon, WC1E 6BT EMAIL: marek@cege.ucl.ac.uk TEL: +44 (0) 20 7679 1359 (Direct Dial) INTERNAL: 31359 FAX: +44 (0) 20 7679 3042 SKYPE: marek.ziebart WEB: http://www.cege.ucl.ac.uk/ OFFICE: Room 118, 1st floor, Chadwick Building "Every honest researcher I know admits he's just a professional amateur. He= 's doing whatever he's doing for the first time. That makes him an amateur.= He has sense enough to know that he's going to have a lot of trouble, so t= hat makes him a professional. " Charles Franklin Kettering (1876-1958) U. S. Engineer and Inventor. Please do not reply directly to this message, but send comments and suggestions to IDS.central.bureau@cls.fr