Received: from cluster-jaune.cls.fr (cl1-jaune.cls.fr [91.207.20.90]) by sympa-ext.cls.fr (8.13.1/8.13.1) with ESMTP id q4PG0jSO014041 for ; Fri, 25 May 2012 16:00:45 GMT Received: by cluster-jaune.cls.fr (Postfix) id 0EACEE8BD1; Fri, 25 May 2012 16:00:45 +0000 (GMT) Delivered-To: ids.analysis.forum@cls.fr Received: from cluster-d.mailcontrol.com (cluster-d.mailcontrol.com [85.115.60.190]) by cluster-jaune.cls.fr (Postfix) with ESMTP id 16C83E8A5F; Fri, 25 May 2012 16:00:44 +0000 (GMT) Received: from gfz-potsdam.de (gfz-potsdam.de [139.17.3.251]) by rly05d.srv.mailcontrol.com (MailControl) with ESMTP id q4PG0eE8005606; Fri, 25 May 2012 17:00:41 +0100 Received: from [129.247.240.235] (account rudenko@gfz-potsdam.de HELO [129.247.240.235]) by cgp2.gfz-potsdam.de (CommuniGate Pro SMTP 5.4.2) with ESMTPSA id 8492602; Fri, 25 May 2012 18:00:39 +0200 Message-ID: <4FBFACA6.7030507@gfz-potsdam.de> Date: Fri, 25 May 2012 18:00:38 +0200 From: Sergei Rudenko User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:12.0) Gecko/20120427 Thunderbird/12.0.1 MIME-Version: 1.0 To: "ids.analysis.forum@cls.fr" Cc: "ids.awg@cls.fr" , Pascal Willis , Carey Noll , "Frank G. Lemoine" , Bruno Garayt , Pascale Ferrage , John Ries , Laurent Soudarin , Chopo Ma , =?ISO-8859-1?Q?Tilo_Sch=F6ne?= , Sergei Rudenko References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Mailcontrol-Inbound: URSqnwAX9OErYq1Wgw6D1z3ikSv5casJWNkuoo60Zso= X-Spam-Score: 2.2 X-Scanned-By: MailControl 7.7.2 (www.mailcontrol.com) on 10.68.0.115 X-Validation-by: lsoudarin@cls.fr Subject: [ids.analysis.forum] GFZ SLCCI precise orbits of altimetry satellites ERS-1, ERS-2 and Envisat in ITRF2008 Dear colleagues, I would like to inform you that new precise orbits of altimetry satellites ERS-1 (August 1, 1991 - July 5, 1996), ERS-2 (May 16, 1995 - February 27, 2006) and Envisat (April 12, 2002 - January 3, 2011) were derived at the time spans given at Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences within the Sea Level project of the European Space Agency (ESA) Climate Change Initiative using "Earth Parameter and Orbit System - Orbit Computation (EPOS-OC)" software and the Altimeter Database and processing System (ADS, http://adsc.gfz-potsdam.de/ads/) developed at GFZ. The orbits were computed in the same (ITRF2008) terrestrial reference frame for all satellites using common, most precise models and standards available and described below. The ERS-1 orbit is computed using satellite laser ranging (SLR) and altimeter crossover data, while the ERS-2 orbit is derived using additionally Precise Range And Range-rate Equipment (PRARE) measurements. The Envisat orbit is based on Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS) and SLR observations. The orbit files are available in the Extended Standard Product 3 Orbit Format (SP3-c, ftp://igscb.jpl.nasa.gov/igscb/data/format/sp3c.txt) via ftp at ftp://slcci:slcci@ftp.esa-sealevel-cci.org/Data/WP2200/GFZ_SLCCI_ER1_V2/ for ERS-1 orbit, ftp://slcci:slcci@ftp.esa-sealevel-cci.org/Data/WP2200/GFZ_SLCCI_ER2_V2/ for ERS-2 orbit, ftp://slcci:slcci@ftp.esa-sealevel-cci.org/Data/WP2200/GFZ_SLCCI_ENV/ for Envisat orbit, Files are gzip-compressed. File names are given as sate_YYYYMMDD_SP3C.gz, where "sate" is the abbreviation (ERS1, ERS2, ENVI) of the satellite name, YYYY stands for 4-digit year, MM stands for month and DD stands for day of the beginning of the file. To reference these orbits in publications please use (for the moment) the following citation: Rudenko, S., Schoene, T., Esselborn, S. and Storr, H. Computation and evaluation of new consistent orbits of Envisat, ERS-1 and ERS-2 in the ITRF2008 reference frame, Geophysical Research Abstracts, Vol. 14, EGU2012-5894-1, 2012. The list of the main models used to compute these orbits follows. Terrestrial Reference Frame ITRF2008 (Altamimi et al., 2011), SLRF2008 (Pavlis, 2009) and DPOD2008 (Willis, 2011) are used for stations missing in ITRF2008 Polar motion and UT1 IERS EOP 08 C04 (IAU2000A) series with IERS daily and sub-daily corrections Precession and Nutation model IERS Conventions (2010) Gravity field (static) EIGEN-GL04S-ANNUAL (Lemoine et al., 2007) Gravity field (time varying) Annual and semi-annual variation up to degree and order 50 from EIGEN-GL04S-ANNUAL gravity field model (Lemoine et al., 2007) Solid Earth tides IERS Conventions (2010) Pole tide IERS Conventions (2010) Ocean tides EOT10A (Savcenko and Bosch, 2010), all constituents up to degree and order 50 Atmospheric tides Biancale and Bode (2006) Atmospheric gravity ECMWF 6-hourly fields up to degree and order 50 (Flechtner, 2007) Third bodies Sun, Moon, Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto (DE-421) (Folkner et al., 2009) More details will be given in a peer-reviewed paper under preparation. Use of data from the International Laser Ranging Service, the International DORIS Service, the International Earth Rotation and Reference Systems Service is acknowledged. Radar Altimetry data were provided by ESA for ERS-1, ERS-2 and Envisat. I would like to acknowledge the contributions of the colleagues Tilo Schoene, Helmut Storr and Jean-Claude Raimondo, as well as useful discussions with the colleagues of GFZ Section 1.2 "Geomonitoring and Gravity Field". This research was performed within the ESA Climate Change Initiative Sea Level project that is gratefully acknowledged. In case of questions please contact Sergei Rudenko or Tilo Schoene: rudenko@gfz-potsdam.de tschoene@gfz-potsdam.de With kind regards, Sergei Rudenko (On behalf of the co-authors) --- Dr. Sergei Rudenko Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences Department 1: Geodesy and Remote Sensing Section 1.2: Global Geomonitoring and Gravity Field Telegrafenberg D-14473 Potsdam Germany E-mail: rudenko@gfz-potsdam.de Phone: +49-8153-281578 Fax: +49-8153-281735 http://www.gfz-potsdam.de/portal/-?$part=GFZ&$event=profile&username=rudenko