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C hina F rance O ceanography S A T elliteellite The CFOSAT project: a cooperation to assess wave directional spectra and surface winds P.Castillan (1), N. Corcoral (1), C. Tison (1), T. Amiot (1), E. Thouvenot (1), D. Hauser (2) (1) CNES, Altimetry and Radar department, France (2) OVSQ, CNRS, LATMOS-IPSL, France Patrick.castillan@cnes.fr

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2 Summary What is the CFOSAT mission? Mission objectives Description of CFOSAT Focus on the SWIM instrument

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3 The CFOSAT mission CFOSAT: an innovative China/France mission for oceanography Joint measurements of oceanic wind and waves SWIM: a wave scatterometer (new instrument) SCAT: a wind scatterometer (fan beam concept) SWIM, new spaceborne instrument with technology innovations (antenna, on-board digital processing) SCAT, new concept of wind scatterometer Access to 2D wave spectrum with high angular resolution and with global scale Joint measurements of winds and waves This mission is a world premire SWIM SCAT

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4 The CFOSAT mission CFOSAT is: a scientific mission for public services (Meteorology agencies, research centers, marine agencies, etc.) a demonstration and pre-operational mission (for Mto France, EUMETSAT, CEPMMT, etc.) In situ observations Spatial observations Models Forecast CFOSAT adds: a new component to spatial oceanography systems assimilation of CFOSAT data in meteorological models possible integration of CFOSAT wave measures in GMES/MyOcean, GlobWave.

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5 Key dates 2006 Signature of the Memorandum Of Understanding CFOSAT 2007- 2008 Phase A CFOSAT Feasibility demonstration 2009-2010 Phase B CFOSAT Preliminary design 2011-2014 Phases C/D CFOSAT Detailed design Manufacturing of flight model and qualification models 2015 Operational system in orbit Launch from China (end of 2014)

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6 Satellite control A China/France cooperation Platform CNSA/DFH SCAT CNSA/CAS (CSSAR) SWIM CNES Contract : Thales Alenia Space Stations CNSA Chinese mission center CHOGS CNSA/NSOAS Operations CNSA Operations / Mission Satellite X-band TM CNSA/CNES Contract : Thales Alenia Space X-band stations CNSA/NSOAS Launch / campaign Polar X-band stations CNES Contract : SSC French mission center FROGS CNES/IFREMER Control center CNSA Network CNSA CFOSAT system science & data Principal Investigators D.Hauser CNRS/LATMOS Liu Jianqiang - NSOAS

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7 Scientific objectives Global observation of ocean wind and waves with high temporal coverage Why? To improve wind and wave forecast and sea-state monitoring To improve the knowledge and the modeling of sea-surface processes To get a simultaneous wind and wave measures for coupling effects characterization Waves generation by local winds Free propagation (swell) Bathymetry impact Coastal wave breaking Secondary objectives (for SWIM) Land surface monitoring (soil moisture and soil roughness) Polar ice sheet characteristics

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8 CFOSAT goals Sea state conditions have great impact on: Commercial activities: marine transport and offshore activity (oil platform) Pollution transport Security at sea and in coastal areas Biology and sediment transport Sea-ice formation/destruction Gas exchange (CO2), stress over the ocean, heat fluxes Sea color (Albedo) Wind and waves measures are mandatory for weather forecast and climate survey.

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9 Scientific requirements Mission Minimum duration of 3 years Global coverage over the oceans (polar orbit) Data available in near-real time SWIM Directional wave spectra from incidences 6 to 8 To be measured in the wavelength range 70m-500m With a 10% accuracy on wavelength, 15 accuracy on wave propagation direction With a 15% accuracy on spectral level around the peak of the spectrum Significant wave height and wind speed from nadir 10% on SWH (or 50 cm whichever is better) rms

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10 Payloads SWIM Surface Waves Investigation and Monitoring Real aperture radar in Ku-band 6 incidence angles: 0, 2, 4, 6, 8 et 10 Antenna diameter: 90 cm (~2 aperture) Polarization VV Rotation speed: 5.7 rpm Power: 120 W Useful bandwidth: 320MHz Pulse duration: 50 s PRF: 2 - 7 kHz Two scientific payloads SWIM: Surface Waves Investigation and Monitoring SCAT: wind SCATterometer

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11 Payloads SCAT Wind SCATterometer Real aperture radar in Ku-band Fan beam concept Incidence angles (on ground): 20-65 Antenna size: 1.2mx0.4m Alternate polarization: HH-VV Rotation speed: 3.2 rpm Power: 120 W Useful bandwidth: 0.5 MHz Two scientific payloads SWIM: Surface Waves Investigation and Monitoring SCAT: wind SCATterometer CSSAR/CAS

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12 Satellite Mass and dimensions Mass ~600 kg Primary structure ~1.5mx1.5mx1.5m Orbit Sun synchronous Local time at descending node AM 7:00 Altitude at the equator 519 km Cycle duration 13 days

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13 CFOSAT Movie

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14 Ground system IWWOC Waves & Wind Mission Center Brest CWWIC Instruments Mission Center Toulouse Control center S-band network Xian Sanya Chinese Mission Center Beijing Mudanjiang Beijing Kiruna Inuvik Users Worldwide

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