ERS and Envisat Precise Orbit Determination: Status

Status

New ERS-2 orbits processed with the EIGEN-GRACE01S gravity field and other updated force models are available from 2002 unwards, including SLR-only orbits after June 2003.

Precise Envisat orbits processed with SLR and DORIS data and the EIGEN-GRACE01S gravity field are available since the start of the DORIS data availability.

What's new

• ERS-2 and Envisat EIGEN-GRACE01S orbits, which have been available by ftp for some time now, have now also been linked from this website.
  

• Changes made to getorb package for compatibility with Red Hat 7.0.
  Download getorb_2.1.5 now.

• Extra utilities included in the getorb package (version 2.1.4).
  Go for the download now.
• New on-line utilities.
  Interpolate orbits and do date conversions on-line.
• Precise ERS-2 orbits are available till [an error occurred while processing this directive].
  Go for the download now.

• Precise ERS-2 orbits are available till 14 October 1999 (end of Cycle 46). Earlier released versions for Cycles 43 and 44 have been updated.
  
• Preliminary ERS-2 orbits are available till 4 February 2000 (early Cycle 50).
  

• Fast-delivery orbits for ERS-1 (since July 1999) are available.
  
• Precise ERS-2 orbits are available till 5 August 1999 (end of Cycle 44).
  
• Preliminary ERS-2 orbits are available till 31 October 1999 (mid Cycle 47).
  
• All orbits have been moved back to the RADS server
  ftp://dutlru2.lr.tudelft.nl/pub/orbits/

• Precise ERS-2 orbits for Cycles 39-41 (1 January to 22 April 1999).
• All orbits are now stored on both FTP sites arc by arc. This makes updating more easy and if you want to mirror the sites yourself, you have short download times.

• Precise ERS-2 orbits for Cycles 35-38 (20 August 1998 to 7 January 1999).
• Precise ERS-1 orbits for Mission Phases A and B (30 July 1991 to 11 April 1992). Note that these orbits have a lesser precision than others because of the limited amount of tracking.

• Precise ERS-2 orbits for Cycle 34 (16 July to 20 August 1998).

• Precise ERS-2 orbits for Cycles 31-33 (27 March to 16 July 1998).

• Precise ERS-2 orbits for Cycles 29-30 (20 January to 27 March 1998).
• SLR tracking to ERS-1 has commenced again.

• Precise ERS-2 orbits for Cycles 27-28 (11 November 1997 to 22 January 1998).

• Precise ERS-2 orbits for Cycles 23-26 (23 June to 13 November 1997).

• Precise ERS-2 orbits for Cycles 17-22 (27 November 1996 to 25 June 1997).
• Preliminary orbits now also available at a few weeks delay, based on SLR and OPR-1 derived altimeter crossovers. Read how to download these orbits now.
• A full FTP site has now been provided at DEOS. Read how to download or go directly to ftp://dutlru2.lr.tudelft.nl/pub/orbits/
• Regular updates of sea level anomalies in the Central Pacific displaying the effect on sea level of the 1997/1998 El Niño. These results are based on the ESA OPR-1 altimeter data enhanced with Delft ERS-2 Preliminary orbits.

• Study results presented in HTML form: Effect of orbit precision on ERS Sea State Bias models

• ERS-2 orbits beyond the Tandem Mission are available till 27 Novermber 1996 (up to and including Cycle 16). This covers all available ERS-2 OPR altimeter products to date. Download them now.
• The Web Pages have a new layout. Hopefully this makes the information
• The tar files in which the ERS-1 and ERS-2 orbit files where distributed before are repackaged to archives of 4 MBytes maximum. This has, however, no impact on the orbits itself.

NEW since 1 April 1997

• Over 4 years of ERS-1 orbits (April 1992 - May 1996) are now available, consistently produced with the DGM-E04 gravity field model. This completes the production of all ERS-1 orbits. Download.
• Orbits for the ERS tandem mission have been completed until the end of the ERS-1 mission. The orbit determination for the two satellites is combined during this period, using SLR, single and dual satellite crossovers as tracking data. Precise orbits for ERS-2 are available for the period May 1995 - May 1996. Download.

This page was created by Remko Scharroo, remko.scharroo@noaa.gov It is currently maintained by Eelco Doornbos, e.n.doornbos@tudelft.nl