| Date: | 2009-03-09 16:08:00 | |
| Sender: | Frank Lemoine (NASA GSFC), Pascale Ferrage (CNES) <slrmail@dgfi3.dgfi.badw-muenchen.de> | |
| Subject: | [SLR-Mail] No. 1759: DORIS Constellation Status and Future Missions Including SLR | |
| Author: | Frank Lemoine | |
| Content: | ******************************************************************************** SLR Electronic Mail 2009-03-09 16:08:00 UTC Message No. 1759 ******************************************************************************** Author: Frank Lemoine (NASA GSFC), Pascale Ferrage (CNES) Subject: DORIS Constellation Status and Future Missions Including SLR Dear Colleagues, The purpose of this message is to summarize the current status of the DORIS on-orbit constellation as of February 2009 as well as plans for the future. The missions that include a laser retroreflector array (LRA) ar= e marked with an asterisk. A whole sequence of ocean radar altimeter missions are planned that will include SLR, DORIS and GPS tracking. This message is not meant to exhaustively summarize future missions that might include SLR. For that summary, please see the ILRS website at the URL= : http://ilrs.gsfc.nasa.gov/satellite_missions/list_of_satellites/index.html You will find a detailled description of the the DORIS and DORIS+SLR(+GPS) missions on the official web site AVISO : http://www.aviso.oceanobs.com/en/doris/doris-missions/index.html, with a synthetic illustration on http://www.aviso.oceanobs.com/en/doris/doris-applications/index.html CURRENT ON-ORBIT CONSTELLATION =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D Currently six DORIS contributor satellites are in flight, and their measurements are available at the IDS data centers. (1)=A0 SPOT-2: (CNES) was launched in 1990, with the first DORIS receiver for a 6-month experiment. More than 18 years after the launch, this receive= r is still fully operational. It will be will be de-orbited in June 2009 (maneuvers will be performed in order to lower the orbit so that the spacecraft will re-enter the Earth´s atmosphere within 25 years). =A0 URL:=A0 http://smsc.cnes.fr/SPOT/ (2) SPOT-4 (CNES) was launched in 1998, and is expected to continue until 2012. =A0 URL: http://smsc.cnes.fr/SPOT/ ***(3)=A0 JASON-1, the CNES/NASA TOPEX follow-on mission was launched on December 7, 2001 with a miniaturized second generation DORIS receiver, a GPS receiver and LRA. Due to the South Atlantic Anomaly (SAA) effect on the Jason1 on-board Ultra Stable Oscillators (USO),a correction model has been developed (J.M. Lemoine and H. Capdeville, J. Geodesy, 2006)=A0 and is available on IDS website http://ftp.cls.fr/pub/ids/satellites/CORRECTIVE_MODEL_JASON1/ =A0 Mission URL: http://topex-www.jpl.nasa.gov/mission/jason-1.html ***(4) ENVISAT, (ESA) was launched on March 1, 2002 with a second generation DORIS receiver and a laser retroreflector array (LRA). =A0Mission URL: http://envisat.esa.int/ (5)=A0 SPOT-5 (CNES) was launched on May 4, 2002 with a miniaturized second generation DORIS receiver. The mission should be extended to 2015. Mission URL: http://smsc.cnes.fr/SPOT/ ***(6) OSTM/JASON-2 (CNES/NASA/EUMETSAT/NOAA) - The TOPEX/Poseidon and Jason-1 follow-on ocean observation mission was launched on June 20 2008. JASON-2 includes the new DGXX DORIS receiver (7-channels: beacons simultaneous tracking capability has been increased to seven beacons, USO new generation allowing a better frequency stability while crossing SAA, a better quality of medium orbit ephemeris production), and LRA and GPS as tracking systems. Mission URLs:=A0=20 http://www.osd.noaa.gov/ostm/=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0= =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 http://sealevel.jpl.nasa.gov/mission/ostm.html http://smsc.cnes.fr/JASON2/ >From June 2008 to end of January 2009, the both satellites Jason-1 and OSTM/Jason-2 were on the same orbit with one minute shift. Then, thanks to five orbit change manoeuvers peformed between January 26th 2009 and February 14th 2009, Jason-1 is now located in an interleaved orbit with respect to Jason-2, with a time lag of approximately 5 days. This new tandem configuration better data acquisition for real-time applications in oceanography. CONFIRMED=A0 FUTURE DORIS MISSIONS: =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D The future DORIS missions are numerous and should guarantee a constellation with at least four DORIS contributor satellites through 2020: ***(1)=A0 CRYOSAT-2 (ESA): is to be launched in November 2009 with on board= a DORIS DGXX Receiver + LRA,=A0 (3.5 years as nominal lifetime) =A0=A0=A0=A0=A0 URL: http://www.esa.int/esaLP/LPcryosat.html ***(2)=A0 HY2A (China Academy of Space), is to be launched in June 2010, wi= th on board a DORIS DGXX + LRA + GPS (nominal life time of 3 years) URL: http://www.aviso.oceanobs.com/fr/missions/missions-futures/hy-2/index.ht ml ***(3) SARAL/ALTIKA (ISRO/CNES) is to be launched from mid-2010, with a DORIS DGXX + LRA (nominal lifetime of 5 years) =A0=A0(ISRO =3D Indian Space Research Organization, www.isro.org) Mission URL´s=A0=20 http://www.cnes.fr/web/CNES-en/5894-altika.php http://www.aviso.oceanobs.com/en/missions/future-missions/saral/index.ht ml ***(4) SENTINEL3A (GMES/ESA) is planned for November 2012 (DORIS DGXX + LRA + GPS) (nominal lifetime of 7 years), Then sentinel 3B is planned for+ 2017 Mission URL´s:=A0=20 http://www.esa.int/esaCP/SEMYZS3XQEF_index_0.html http://www.aviso.oceanobs.com/en/missions/future-missions/sentinel-3/ind ex.html PROPOSED FUTURE MISSIONS,=A0 OR MISSIONS AWAITING APPROVAL ------------------------------------------------------------------------ ***(1) JASON3 (Eumetsat/NOAA/CNES) pending approval before end of 2009, is foreseen from mid 2013 (DORIS DGXX + LRA + GPS) ***(2) SWOT (Surface Water Ocean Topography)=A0 Mission is foreseen for end of 2016 (DGXX + GPS + LRA) Mission URL´s:=20 http://bprc.osu.edu/water/index.php http://www.aviso.oceanobs.com/en/missions/future-missions/swot/index.htm l ***(3) HY2 Missions and DORIS on board=A0 are pending approval:=A0 HY2B 201= 2, HY2C 2015, HY2D 2019: DORIS + GPS + LRA. ***(4) Sentinel 3C, D with DORIS+GPS+LRA from 2021: to be confirmed. ---1149172827-1540560652-1236611280=:5226-- From: slrmail@dgfi3.dgfi.badw-muenchen.de ******************************************************************************** |