ERS and ENVISAT missions status

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1 FRINGE 2005 Workshop ERS and ENVISAT missions status Wolfgang Lengert ERS Mission Manager

2 ERS-2 mission 14 years of ERS-1/2 data in the archive (suitable for applications requiring long term series products) ERS-2 achieved 10 years in orbit in April 2005 (was designed for 3 years nominal lifetime) Some problems with the platform (gyroscope in 2001, tape recorder in 2003) but all instruments still functioning well engineering solutions have been developed: - new 'gyro-less' working mode - set up of a station network for Low Bit Rate data recovery Operations funding expected until 2008

3 ERS-1 and ERS-2 missions phases summary Commissioning Ice Roll-tilt (experimental) Multi-disciplinary 2 nd ice Geodetic Shifted Geodetic 2 nd Multi-disciplinary More than 13 years 35 days repeat cycle With 4 years in relaxed attitude control Tandem Commissioning Back-up Tandem Multi-disciplinary

4 ERS satellite and payload status Mission elements Service Module Propulsion and Hydrazine Payload Equipment Bay SAR Image Mode SAR Wave Mode Expected evolution Good Fair Comments Relaxed attitude control +- 2deg, all other subsystems with full redundancy. SPOT-1 platform flown for 17 years before de-orbiting. Only 1/3 of hydrazine has been consumed within 10 years Tape Recorders Failed, Real time mission only with some 40% global coverage. Transmission Tube redundancy available. Scatterometer Fair Sub System on redundant side RA & MWR ATSR GOME PRARE Good Good Scan Mirror problem has been overcome by patches on ground Callibration lamp problem has been overcome by patches on ground Reduced surface transponders covering North & South Poles and Europe only; no redundancy

5 ENVISAT mission Largest European satellite & largest worldwide EO satellite: - unique combination of 9 instruments addressing land, ocean, ice and atmosphere studies, - instruments working nominally, except for MIPAS (discontinuous operations). Satellite OK with mid-term operations capabilities: - 65 % of hydrazine available, - the on-board hydrazine is the main limiting factor for the mission lifetime 78 different types of data products 250 Gigabytes of data products generated per day Operations funding expected until 2010

6 Envisat satellite and payload status Mission elements Service Module Propulsion and Hydrazine Payload Equipment Bay ASAR MERIS AATSR RA-2 MWR DORIS SCIAMACHY MIPAS GOMOS Expected evolution Fair Fair Good Good Fair Bad Fair Comments Main limiting factor of the mission Sub-system on redundant side Instrument on redundant side Progressive mechanical degradation in non redundant part Instrument on redundant side

7 Envisat hydrazine consumption Hydrazine consumption Preliminary prediction Based on current orbit control (+/- 1km), prediction with 3 scenarios: optimistic, typical, worse case 100% 90% Hydrazine available onboard 80% 70% 60% 50% 40% 30% Performances better than expected so far today FRINGE 03 recommendation to decrease deadband to +/- 500 m cannot be implemented in order to preserve satellite lifetime optimistic 20% 10% typical worse case 0% Mar-2002 Jul-2003 Nov-2004 Apr-2006 Aug-2007 Jan-2009 May-2010

8 ERS-2 ERS-2 SAR SAR instrument instrument use use ERS-2 SAR current use: some 4 minutes/orbit Tromso Prince-Albert Kiruna Fairbanks West-Freugh Norman Gatineau Kanthy Mansisk Neustrelitz Fucino Matera Tel-Aviv Lybia Miami Maspalomas Chetumal Hyderabad Beijing Bangkok Hatoyama Kumamot o Singapore Cotopaxi Cuiaba ERS-1/2 SAR data repatriation from Foreign Stations to Europe Pare-Pare Malindi Alice-Springs Johannesburg Cordoba O Higgins Syowa Hobart MacMurdo

9 Envisat ASAR instrument use ASAR Envisat ASAR current use: some 17 minutes/orbit min. / orbit (7000 km) Multiplication by two of ASAR data acquisition between 2003 and % in Image mode (i.e. 6 min./orbit) 5% in Alternating Polarisation mode 60% in Wide Swath mode Average minutes / orbit January February 8 min. / orbit (3200 km) March April May June July August September October November FRINGE 03 recommendation to increase amount of data collected through Background Regional Mission: implemented December January February March April May June July August September October November December January February March Worldwide acquisition thanks to on-board recorders and to ESA data relay satellite Artemis (60% of ASAR High Bit Rate data transmitted through Artemis). Remaining acquisitions in Low Bit Rate: Global Monitoring Mode over land and sea ice, Wave Mode over oceans. April May June July August September October

10 Archived SAR data Status of the SAR archives ERS SAR archive: Acquired ERS-1 SAR scenes: 1.6 Mio Bytes ~ 1 PByte Acquired ERS-2 SAR scenes: 1.9 Mio Archived SAR scenes in ESA archive: 1.8 Mio (including overlap) ERS Tandem data have been repatriated (~ scenes) Repatriation of ERS data archived in Foreign stations is ongoing Envisat ASAR archive: 850 Mkm 2 per month 6 TBytes/month

11 ESA Earth Observation Data Policy Data policy defined by ESA Member States: to stimulate a balanced development of Science, Public Utility and Commercial Applications, consistent with the mission objectives, to maximize the beneficial use of data from ESA EO satellites. Project purpose Distribution responsible Data costs Category 1 use Research, Applications Development esa using ESA facilities/stations costs of reproduction Category 2 use Operational & Commercial SAR Utilisation SAR data data available available in in Cat.1 Cat.1 or or Cat.2 Cat.2 competing Distributing Entities using ESA facilities and/or agreements with non-esa stations defined by competing Distributing Entities

12 Prices for Category 1 use ERS & ENVISAT archived SAR product: cost per product = 25 (price was above 100 until 2003) Instrument programming fee for Cat.1 use: ENVISAT ASAR: First 60 sec (400 km) = 80 ; following 15 sec (100 km) = 15 ERS-2 SAR: First 60 sec (400 km) = 60 ; following 15 sec (100 km) = 10 If new acquisition requests coincides with background acquisitions no programming fee is applied