<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<meta name="Generator" content="Microsoft Word 14 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";
mso-fareast-language:EN-US;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p.MsoPlainText, li.MsoPlainText, div.MsoPlainText
{mso-style-priority:99;
mso-style-link:"Plain Text Char";
margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";
mso-fareast-language:EN-US;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri","sans-serif";
color:windowtext;}
span.PlainTextChar
{mso-style-name:"Plain Text Char";
mso-style-priority:99;
mso-style-link:"Plain Text";
font-family:"Calibri","sans-serif";}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri","sans-serif";
mso-fareast-language:EN-US;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="EN-GB" link="blue" vlink="purple">
<div class="WordSection1">
<p class="MsoNormal">With apologies for cross posting, please consider submitting an abstract for the following session at the European Geosciences Union General Assembly, Vienna, 2012:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoPlainText">EGU General Assembly -- Vienna, Austria, 22 - 27 April 2012<o:p></o:p></p>
<p class="MsoNormal"> <a href="http://meetings.copernicus.org/egu2012/">
http://meetings.copernicus.org/egu2012/</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Submit an abstract via this link:<o:p></o:p></p>
<p class="MsoNormal"><a href="http://meetingorganizer.copernicus.org/EGU2012/session/9724">http://meetingorganizer.copernicus.org/EGU2012/session/9724</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">G2.4<o:p></o:p></p>
<p class="MsoNormal">Space vehicle dynamics as applied to precise orbit determination and validation: pushing the edge of the envelope<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Convener: Marek Ziebart <o:p></o:p></p>
<p class="MsoNormal">Co-Convener: Urs Hugentobler <o:p></o:p></p>
<p class="MsoNormal">Abstract Submission<o:p></o:p></p>
<p class="MsoNormal">Convener Login<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The accuracy of satellite precise orbit determination underpins fundamentally many applications of geodesy to earth and other planetary science. Our current principal challenge is to determine orbits at the centimetre, or even sub-centimetre,
level. New constellations of GNSS are being launched offering new technical hurdles and opportunities; improved gravity field models are available through the extended analysis of GRACE data and new LEO position-critical missions (e.g. Jason-2, GOCE, CRYOSAT-2)
are currently on orbit. Reprocessing campaigns and improved observable modelling offer outstanding experimental data to test approaches to orbit determination. However, time series analysis of estimated tracking station coordinates indicates significant energy
in observable residuals at draconitic and beta-prime (solar) related periods. Modelling of satellite surface forces is still problematic. Many issues need to be explored by the community but at the same time we have strong indication of emerging techniques
and models that stand to improve orbit determination against a range of metrics.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">In particular we encourage contributions to the session that make accessible the technical challenges of orbit determination and modelling to the wider community, quantifying the nature of the impact of dynamics errors on geodetic parameters
and the terrestrial reference frame.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">This session solicits contributions in the following areas: (1) precise orbit determination and validation; (2) impacts of new gravity field models on orbit determination; (3) satellite surface force modelling; (4) advances in 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 from improved force modelling/orbit determination
methods; (7) relevant improvements in observable modelling for all tracking systems, e.g. SLR, DORIS, GNSS and their impact upon orbit determination; (8) the impact of improved clock modelling methods/space clocks on precise orbit determination; (9) advances
in understanding and modelling satellite attitude behaviour; (10) orbit determination for other solar system missions; (11) insights into GPS long term orbit behaviour through the IGS re-processing campaigns; (12) insights into LEO long term orbit behaviour
through the Jason/TOPEX reprocessing campaigns<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We look forward to seeing you in Vienna,<o:p></o:p></p>
<p class="MsoNormal">Marek and Urs<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Marek Ziebart<o:p></o:p></p>
<p class="MsoNormal">Professor of Space Geodesy<o:p></o:p></p>
<p class="MsoNormal">Director, Space Geodesy and Navigation Laboratory <o:p></o:p></p>
<p class="MsoNormal">Vice Dean for Research, Faculty of Engineering Sciences<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">University College London,<o:p></o:p></p>
<p class="MsoNormal">Department of Civil, Environmental and Geomatic Engineering Gower Street, London, WC1E 6BT<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">EMAIL: <a href="mailto:marek@cege.ucl.ac.uk"><span style="color:blue">marek@cege.ucl.ac.uk</span></a><o:p></o:p></p>
<p class="MsoNormal">TEL: +44 (0) 20 7679 1359 (Direct Dial)<o:p></o:p></p>
<p class="MsoNormal">INTERNAL: 31359<o:p></o:p></p>
<p class="MsoNormal">FAX: +44 (0) 20 7679 3042<o:p></o:p></p>
<p class="MsoNormal">SKYPE: marek.ziebart<o:p></o:p></p>
<p class="MsoNormal">WEB: <a href="http://www.cege.ucl.ac.uk/"><span style="color:blue">http://www.cege.ucl.ac.uk/</span></a><o:p></o:p></p>
<p class="MsoNormal">OFFICE: Room 118, 1st floor, Chadwick Building<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">“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 that makes him a professional. “<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><i><span style="mso-fareast-language:EN-GB">Charles Franklin Kettering (1876-1958) U. S. Engineer and Inventor.</span></i><span style="mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</body>
</html>