ERS|ERS Precise Orbit Determination: Orbits ERSPreciseOrbitDetermination:Orbits

http://www.deos.tudelft.nl/ers/precorbs/orbits/

The followings links provide you access to the latest ERS and Envisat orbits from DEOS.
Historical DGM-E04 orbits for ERS-1 and ERS-2 ...

ERS-1 precise (DGM-E04) orbits: These ERS-1 orbits are based on SLR and OPR-2 altimeter crossovers and normal points. They are available for quite some time now.
ERS-1 fast-delivery (DGM-E04) orbits: These ERS-1 orbits are based on SLR normal points and were made available with a latency of about a week.
ERS-2 precise (DGM-E04) orbits: These ERS-2 orbits are based on SLR and OPR-2 altimeter crossovers and normal points. The orbit files were made available with a latency of about six months.
ERS-2 preliminary (DGM-E04) orbits: These ERS-2 orbits are based on SLR and OPR-1 altimeter crossovers and normal points. The orbit files were made available with a latency of about a month.
ERS-2 fast-delivery (DGM-E04) orbits: These ERS-2 orbits are based on SLR and fast-delivery altimeter crossovers and normal points. The orbit files were made available with a latency of about a week. They were updated on Tuesday and Friday afternoon and mirrored on both FTP sites.

New EIGEN-GRACE01S and EIGEN-CG03C orbits for ERS-2 and Envisat ...

ERS-2 orbits for InSAR support (EIGEN-GRACE01S orbits): These ERS-2 orbits are currently based on SLR data only, after the failure of the last on-board tape recorder and the end of the global ERS-2 altimetry dataset in June 2003. Enhanced gravitational and non-gravitational force models are used to maintain the best attainable orbit accuracy. Orbits with these models have been back-processed to cycle 70, corresponding to December 2001/January 2002. The orbit files are available with a latency of 1 to 3 months.
Envisat precise orbits (EIGEN-CG03C orbits): These Envisat orbits are based on SLR and DORIS data. The orbit files are available with a latency of 1 to 3 months, depending on the availability of DORIS tracking data.

Note that the EIGEN-GRACE01S orbits for Envisat processed after the summer of 2006 contained a bug in the processing, causing them to be slightly less accurate (< 2 cm RMS error), and systematically too high by about 5 mm, from cycle 30 onwards. All users of these Envisat orbits, especially altimetry users, are recommended to replace all their EIGEN-GRACE01S orbits with the new EIGEN-CG03C orbits.
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This page was created by Remko Scharroo, remko.scharroo@noaa.gov
It is currently maintained by Eelco Doornbos, e.n.doornbos@tudelft.nl