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Report for WP 3300

Report for WP 3300. WP 3300. WP 3300 Mission Concepts – Space Segment Contents. Payload Aspects: Geostationary Instruments (Inputs from WP 3100) Low Earth Orbit Instruments (Inputs from WP 3200) Mission Aspects: Alternative Mission Concepts - Options for LEO/MEO Constellations.

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Report for WP 3300

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  1. Report for WP 3300 WP 3300 Capacity Final Presentation, 02.06.2005, Estec, Noordwijk

  2. WP 3300 Mission Concepts – Space SegmentContents • Payload Aspects: • Geostationary Instruments(Inputs from WP 3100) • Low Earth Orbit Instruments(Inputs from WP 3200) • Mission Aspects:Alternative Mission Concepts - Options for LEO/MEO Constellations Capacity Final Presentation, 02.06.2005, Estec, Noordwijk

  3. Report for WP 3300 WP 3300 Payload Aspects Capacity Final Presentation, 02.06.2005, Estec, Noordwijk

  4. WP 3300 Payload: Status/Overview • Based on the inputs of WP 3100 for geostationary and of WP 3200 for low earth orbit applications first assessments to show feasibility are performed. • Most of the defined mission requirements are reviewed and iterated with WP3100 and WP 3200. • The requirements are analysed by showing similarity to already existing investigations, mainly derived from the MTG, GeoTrope and Azechem studies. • For specific aspects first mathematical simulations are performed to outline e.g. radiometric instrument performance. • Budgets for mass, power and data rate are derived. • A first rating may be performed based on instrument mass and power budgets. Capacity Final Presentation, 02.06.2005, Estec, Noordwijk

  5. WP 3300 Geo Mission (inputs from WP 3100):Common Aspects • Compared to the Full Disk Coverage required for MTG (see GeoTROPE red) for CAPACITY the local coverage is limited to Europe (see GeoTROPE blue). Combined with the observation time of 1 hour this is a strong relaxation for Capacity instruments. Capacity Final Presentation, 02.06.2005, Estec, Noordwijk

  6. WP 3300 Geo Mission (inputs from WP 3100):UV-VIS-NIR-SWIR Spectrometer • Status • Inputs from WP 3100 discussed and compared to MTG-UVS • Relaxations to MTG requirements identified • But optional design driving SWIR-channel required • First sizing based on radiometric model performed • Design outline • E-W single axis scanning imaging spectrometer • Aperture diameter between 70 mm and 120 mm (SWIR) • 4 dispersive spectrometers (UV, VIS, NIR and SWIR) • Passive cooling of detectors • Interface Budgets • Mass: 150 kg • Power: 150 W • Data Rate: 5.5 Mbpsec Capacity Final Presentation, 02.06.2005, Estec, Noordwijk

  7. WP 3300 Geo Mission (inputs from WP 3100):IR Spectrometer • Status • Inputs from WP 3100 discussed and compared to MTG-IRS • Both enhancements and relaxations to MTG requirements identified • Especially spectral resolution is design driving • First sizing based on radiometric model performed • Design outline • E/W and S/N dual axis scanning imaging spectrometer • Fourier Transform Spectrometer (FTS) preferred • MTG versus Capacity penalty score results infactor between 0.1 and 5.8 times MTG • Active thermal cooling of detectors needed • Interface Budgets • Mass: 250 kg • Power: 250 W • Data Rate: 15 Mbpsec, FFT processing performed on board Capacity Final Presentation, 02.06.2005, Estec, Noordwijk

  8. WP 3300 LEO Mission (inputs from WP 3200):Mission Options • Based on WP 3200 two different optional sun-synchronous LEO-missions are recommended • For ozone layer and climate observations a LEO-Limb mission which is operated complementary to METOP with improved vertical resolution with • Infrared Sounder Option • or mm Sounder Option or • a LEO-Nadir mission to improve the revisit time for air quality and the observation of diurnal variations for climate applications in an orbit complementary to parallel observations by other missions, e.g. with 11:30 or 15:30 local time with an • UV-VIS-NIR Sounder. Capacity Final Presentation, 02.06.2005, Estec, Noordwijk

  9. WP 3300 LEO Mission (inputs from WP 3200):LEO- Limb Option: IR Sounder • Status • Inputs from WP 3200 discussed and compared to AMIPAS • AMIPAS matches very well into the CAPACITY specifications • First sizing based on radiometric model as performed for AMIPAS • Design outline • elevation single axis scanning imaging spectrometer • Aperture diameter of 70 mm • Michelson Interferometer • Active cooling of detectors • Interface Budgets • Mass: 170 kg • Power: 180 W • Data Rate: 4 Mbps after lossless compression Capacity Final Presentation, 02.06.2005, Estec, Noordwijk

  10. WP 3300 LEO Mission (inputs from WP 3200):LEO- Limb Option: mm Sounder • Status • Inputs from WP 3200 reviewed and compared to MASTER • First sizing based on MASTER • Design outline • elevation single axis scanning antenna • 2 m x 1 m offset Cassegrain antenna • Signal down converted and amplified by a set of heteorodyne radiometers followedby spectrometers • Active cooling of the frontend mixers • Interface Budgets • Mass: 280 kg • Power: 300 W • Data Rate: 120 kbps Capacity Final Presentation, 02.06.2005, Estec, Noordwijk

  11. WP 3300 LEO Mission (inputs from WP 3200):LEO- Nadir Option: UV-VIS-NIR Sounder • Status • Inputs from WP 3200 reviewed and compared to OMI and SCIAMACHY • Design outline • Nadir imaging spectrometer • Aperture diameter in the order of 30 mm • 3 dispersive spectrometers is minimum • Passive cooling of detectors • Interface Budgets • Mass: 65 - 200 kg • Power: 70 - 150 W • Data Rate: TBD Mbpsec Capacity Final Presentation, 02.06.2005, Estec, Noordwijk

  12. WP 3300 Payload Conclusions • A first rating for the development effort of the instruments is based on instrument mass and power budgets. Capacity Final Presentation, 02.06.2005, Estec, Noordwijk

  13. Report for WP 3300 WP 3300 Mission Aspects Capacity Final Presentation, 02.06.2005, Estec, Noordwijk

  14. WP 3300Mission Aspects • One of the new driving observation requirements is the strongly reduced revisit time, e.g. between 0.5 and 2 hours for air quality observations. • If no full global coverage is required, e.g. over Europe only, geostationary observations are most efficient. • But additional observations are needed globally, so a scenario of two complementary missions, one geostationary and one low earth orbit, is baseline. • Optionally scenarios are constellation of 3 Satellites • in a sun-synchronous low/medium earth orbit (LEO/MEO) to achieve full global coverage • in a lower inclined low earth orbit (LEO) to improve the revisit time over Europe with reduced global coverage • Three mission scenarios are analyzed • Sun-Synchronous Option 1 with c.a. 2 hours revisit time • Sun-Synchronous Option 2 with c.a. 4 hours revisit time • 125 deg inclined Orbit with c.a. 2 hours revisit time Capacity Final Presentation, 02.06.2005, Estec, Noordwijk

  15. WP 3300Mission Aspects: OMI Observation Geometry For the assessment of the local coverage the OMI observation geometry has been taken as reference • +/- 57 deg Nadir viewing angle • 705 km altitude • => swath of 2600 km • => min. LOS/horizon angle of 21 deg Capacity Final Presentation, 02.06.2005, Estec, Noordwijk

  16. WP 3300Mission Aspects: Capacity Observation Geometry Capacity Final Presentation, 02.06.2005, Estec, Noordwijk

  17. 4mm shielding WP 3300Mission Aspects: Radiation Environment Capacity 2 hours Capacity 4 hours Envisat Capacity Final Presentation, 02.06.2005, Estec, Noordwijk

  18. WP 3300Mission Aspects: 894 km sun-synchronous orbit Capacity Final Presentation, 02.06.2005, Estec, Noordwijk

  19. WP 3300Mission Aspects: 894 km sun-synchronous orbit • Orbit altitude optimized for coverage of Europe (Latitude > 30 deg) with 2 successive orbit periods => 3.4 h revisit time Capacity Final Presentation, 02.06.2005, Estec, Noordwijk

  20. WP 3300Mission Aspects: 894 km sun-synchronous orbit Capacity Final Presentation, 02.06.2005, Estec, Noordwijk

  21. WP 3300Mission Aspects: 894 km low inclination orbit • Applying a low inclination orbit an local observation of Europe with an increased revisit frequency is feasible • These orbits are not sun-synchronous • => variation of local time over orbit • => strong variation of observation geometry over orbit • => impacts on satellite design, especially power system Capacity Final Presentation, 02.06.2005, Estec, Noordwijk

  22. WP 3300Mission Aspects: 894 km low inclination orbit Capacity Final Presentation, 02.06.2005, Estec, Noordwijk

  23. WP 3300Mission Aspects: 894 km low inclination orbit • Orbit altitude optimized for coverage of Europe (Latitude > 30 deg) with each orbit period => 1.7 h revisit time Capacity Final Presentation, 02.06.2005, Estec, Noordwijk

  24. WP 3300Mission Aspects: 894 km low inclination orbit Capacity Final Presentation, 02.06.2005, Estec, Noordwijk

  25. WP 3300Mission Aspects: Conclusions for Constellation • The revisit time can be strongly reduced by using a constellation of 3 satellites • The orbit selection is limited by the useful viewing angles for Nadir observations and the earth radiation environment • An orbit of 3090 km altitude allows a 2.55 hours revisit time in a sun-synchronous orbit, but for this altitude the total radiation dose can not be handled. • So a constellation of 3 satellites with ca. 894 km orbit altitudes is recommended • Sun-synchronous option • to achieve global earth coverage with 2 successive orbits • with a revisit time of < 3.4 hours over Europe. • Low inclination option • to achieve nearly global earth coverage • with a revisit time of < 1.8 hours over Europe. Capacity Final Presentation, 02.06.2005, Estec, Noordwijk

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