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CMS Lannion Brittany

CMS Lannion Brittany. PASSIVE MICROWAVE PROTECTION. Guy.Rochard@meteo.fr. WMO / ITWG/ EUMETNET/ METEO-FRANCE. Figure 5-2. Sensitivity of brightness temperature to geophysical parameters over ocean surface. Sensitivity of brightness temperature

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CMS Lannion Brittany

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  1. CMS Lannion Brittany

  2. PASSIVE MICROWAVE PROTECTION Guy.Rochard@meteo.fr WMO / ITWG/ EUMETNET/METEO-FRANCE

  3. Figure 5-2 Sensitivity of brightness temperature to geophysical parameters over ocean surface

  4. Sensitivity of brightness temperature to geophysical parameters over land surfaces

  5. SECONDARY LOBE SHAPE

  6. Global composite of brightness temperature (K) from AMSU-A Channel 3

  7. O2 absorption spectrum along a vertical path around 60 GHz (multiple absorption lines) PASSIVE SENSORS REQUIREMENTS IN O 2 ABSORPTION SPECTRUM AROUND 60 GHz (U.S. standard atmosphère - Absorption model: Liebe 1993) RESONANCE FREQUENCIES (GHz) 51.5034 52.0214 Shared 52.5424 53.0669 53.5957 54.1300 54.6712 55.2214 200 55.7838 56.2648 56.3634 56.9682 Excl. 57.6125 58.3239 58.4466 59.1642 Total oxygen absorption along a vertical path (dB) 59.5910 60.3061 60.4348 61.1506 61.8002 100 62.4112 55.78 GHz 62.4863 Excl. 62.9980 59.3 GHz 63.5685 55.22 GHz 64.1278 64.6789 52.6 GHz 65.2241 65.7648 66.3021 50.2-50.4 GHz 66.8368 67.3696 67.9009 0 50 55 60 65 70 Frequency (GHz)

  8. Weigthing functions at 50 to 60 GhZ

  9. Global composite of brigthness temperature (K) measurements from AMSU-A Channel 9

  10. Water vapour absorption spectrum along a vertical path around 183 GHz

  11. The SAPHIR channels over the water vapor line O L 6 5 4 3 2 1 1 2 3 4 5 6 183,31 190 195 175 180 185 GHz

  12. Weigthing functions at 183 GhZ

  13. Global composite of brightness temperature (K) from AMSU-B Channel 3

  14. n Dn DeltaT IFOV SIZE 10-km pixels  57 GHz 0.4 GHz 0.2 K 78 km 60 km 6 x 6 144 ms 1500 K 119 GHz 0.4 GHz 0.4 K 37 km 30 km 3 x 3 72 ms 2200 K 183 GHz 0.3 GHz 0.6 K 24 km 30 km 3 x 3 72 ms 2800 K 380 GHz 0.7 GHz 0.5 K 12 km 30 km 3 x 3 72 ms 3500 K 425 GHz 0.4 GHz 0.5 K 10 km 30 km 3 x 3 72 ms 2700 K 380 GHz 2 GHz 1.5 K 12 km 10 km 1 6 ms 5200 K 425 GHz 1 GHz 1.5 K 10 km 10 km 1 6 ms 3700 K Ts Required system temperatures for GOMAS

  15. INTERNATIONAL TELECOMMUNICATION UNION RADIOCOMMUNICATIONSTUDY GROUPS February 2002 English only Draft Revision OfRECOMMENDATION ITU-R SA.515-3 Frequency bands and bandwidths used for satellite passive sensing (Question ITU-R 140/7 (1978-1990-1994-1997-2002) The ITU Radiocommunication Assembly, considering a) that environmental data relating to the Earth is of increasing importance;

  16. INTERNATIONAL TELECOMMUNICATION UNION RADIOCOMMUNICATIONSTUDY GROUPS February 2002 English only DRAFT REVISION oFRECOMMENDATION ITU-R SA.1028‑1 PERFORMANCE CRITERIA FOR SATELLITE PASSIVE REMOTE SENSING (Question ITU-R 140/7) (1994-1997-2002) The ITU Radiocommunication Assembly, considering a) that certain frequency bands, including some absorption bands of atmospheric gases (e.g., O2(oxygen) and H2O(water vapour)), have been allocated for spaceborne passive microwave remote sensing;

  17. INTERNATIONAL TELECOMMUNICATION UNION RADIOCOMMUNICATIONSTUDY GROUPS February 2002 English only DRAFT REVISION ofRECOMMENDATION ITU-R SA.1029‑1 PERMISSIBLEINTERFERENCE CRITERIALEVELS FOR SATELLITE PASSIVE REMOTE SENSING (Question ITU-R 140/7) (1994-1997-2002) The ITU Radiocommunication Assembly, considering a) that certain frequency bands, including some absorption bands of atmospheric gases (e.g.,O2(oxygen)and H2O(water vapour)), have been allocated for spaceborne passive microwave remote sensing;

  18. http://cimss.ssec.wisc.edu/itwg/groups/frequency/ WEB(s) sites fore more infos. http://guy.rochard.free.fr/meteo/ http://www.eumetnet.eu.org/ http://www.wmo.ch/web/www/TEM/SG-RFC/Handbook.htm http://www.itu.int/ITU-R/index.html http://sfcgonline.org/

  19. Some key problems to solve … To conclude what is needed above 275 GHz (central frequencies and bandwidths) 1) To conclude about ‘Delta T ‘ tables between WMO and ITU proposals 2) To conclude on % of data availability 3) To archive emissivity pictures of the Earth in microwaves below 50 GHz. 4)

  20. BACKGROUND: • Support ITU-Recs 515 , 1028 & 1029 • 2) Follow ITU rules (7C….WRC) • 3) Cooperate as an international scientific • working group for EESS (passive) needs

  21. NEXTSTEPS : • SPIE MEETINGS • IGARSS’ MEETINGS • ITWG MEETINGS • SFCG • ITU-R 7C • WMO FREQUENCY GROUP

  22. Petition for Protection of 23.6 – 24 GHz & other microwave bands for Passive Environmental Remote Sensing http://guy.rochard.free.fr/meteo/ http://guy.rochard.free.fr/meteo/fichiers/petition.doc Guy.Rochard@meteo.fr Common scientific position about the protection of microwave bands for Passive Environmental Remote Sensing

  23. It’s time to push more the EESS community to express and justify clearly the needs. The people contacted for « the petition » could, with other experts sharing the same views, become a working group by correspondance. However, to restart the work, a meeting in USA next spring will put those people together an really restart to work and conclude a report before WRC 07.

  24. SFCG ACTION ITEM No. 24-3-1 SUBJECT: Update of EESS Passive Band Requirements ACTION TO BE TAKEN: 1.) The responsible person and contributors will work together to convene a workshop with passive remote sensing scientists and remote sensing spectrum managers in the spring of 2005 in order to reach agreement on the frequency bands and required radiometer sensitivities 2.) SFCG members are to take the results of the workshop and provide the updated requirements for spaceborne passive sensors, along with accompanying scientific justification and technical feasibility, and input them to SFCG-25 RESPONSIBLE PERSON: Guy Rochard (ITWG) CONTRIBUTORS: D. McGinnis (NOAA) K. Maeda (JAXA) J. Zuzek (NASA) E. Marelli (ESA) M.Dreis (EUMETSAT) , R.Wolf (EUMETSAT) M.Vasiliev (RASA) Z.Sun (CMA) DUE DATE: Workshop middle of spring 2005 and inputs to SFCG by august 2005.

  25. http://www.wmo.int/web/www/TEM/SG-RFC/Handbook.htm  Chapter 5 , second part • So we have to also consider : • REC 577-5 and REC 1166 • Then extend SFCG

  26. SAR Altimeter Scatterometer Precipitation radars Cloud profile radars Viewing geometry Side-looking at 10-55 deg off nadir Nadir-looking 1) Six fan beams in azimuth2) Two conically scanning beams Nadir-looking Nadir-looking Footprint/dynamics 1) Fixed to one side2) ScanSAR Fixed at nadir 1) Fixed in azimuth2) Scanning Scanning across nadir track Fixed at nadir Antenna beam Fan beam Pencil beam 1) Fan beams2) Pencil beams Pencil beam Pencil beam Radiated peak power 1500-8000 W 20 W 100-5000 W 600 W 1000-1500 W Waveform Linear FM pulses Linear FM pulses Interrupted CW orShort Pulses Short pulses Short pulses Bandwidth 20-300 MHz 320 MHz 5 - 80 kHz 14 MHz 300 kHz Duty Factor 1-5 % 46 % 31 % 0.9 % 1-14 % Service Area Land/coastal/Ocean Ocean/Ice Ocean/Ice/Land Land/Ocean Land/Ocean EESS (active)

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