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Managing Geostationary RFI in AMSR-E Data Streams

Explore impacts, implications, and future trends of geostationary RFI in AMSR-E data streams. Discusses satellite positions, power maps, and strategies for minimizing interference. Find out more here!

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Managing Geostationary RFI in AMSR-E Data Streams

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  1. Geostationary RFI in AMSR-E Marty Brewer Frank Wentz, and Peter Ashcroft Remote Sensing Systems, Santa Rosa, CA • Older News Hotbird and Astra 10.65 GHz RFI Europe • Old News DirecTV 18.7 GHz RFI America (USA) • News Atlantic Bird 4A 10.65 GHz RFI Europe • Future ? ? ? Joint AMSR Science Team Meeting - Arlington, VA, June 26-27, 2009

  2. Geostationary RFI @ 10.7 GHz

  3. Geostationary RFI @ 10.7 GHz

  4. Geostationary RFI @ 10.7 GHz ◄ Astra: 19.2° East Longitude ( RFI from 19° not obvious in eastern Mediterranean; highly consistent with power images shown here. ) ▼ Hotbird: 13.0° East Longitude Astra: 19.2° E ▲ Hotbird: 13.0° E ►

  5. DirecTV: Frequencies, Power Maps Not available

  6. DiercTV Dish Size / Power Map http://satellitetv.digitalinsurrection.com/directv/directv.php

  7. Geostationary RFI: Implications • Implemented L2A Version B05 (August, 2005) • Glint Angles computed to 13.0° E and 19.2° E (at geostationary altitude) • L2A V10 (April, 2009) : 99.2° W and 102.8° W for data after July, 2007

  8. RFI in Mediterranean Hotbird / Astra Atlantic Bird 4A + ~10K RFI in AMSR-E 10.65 GHz V

  9. Atlantic Bird 4A Market Excellent Agreement with AMSR-E Observations ▼ Little or no RFI in far Western Mediterranean ▼ Intense RFI in Middle and Eastern Mediterranean

  10. AMSR-E: Frequency and bandwidth 18.7 18.6 – 18.8 ??? - DirecTV-10 @ 102.8 °W ??? - DirecTV-11 @ 99.2 °W 10.65 10.60 – 10.70 10.710 V - Eutelsat W2A @ 10.0°E 10.714 H - Astra 1KR @ 19.2°E 10.719 V - Hot Bird 9 @ 13.0°E 10.719 V - Atlantic Bird 4A at 7.2°W http://weather.msfc.nasa.gov/AMSR/instrument_descrip.html - http://www.lyngsat.com

  11. Lower power, not near 10.65 GHz

  12. Ascending passes AMSR-E L2A:Geostationary_Satellite_Glint_Angle • AMSR-E: No RFI detected in ascending passes • WindSat: 10.7 GHz RFI near Brazil

  13. www.remss.com/RFI

  14. <- 18.7 GHz | 10.65 GHz ->

  15. <- 18.7 GHz | | 10.65 GHz ->

  16. Options: Add to existing glint field: - hard to distinguish in Atlantic Add new glint field: - change and reprocess L2A “Static” “track/path” file(s): - bigger change, no L2A updates

  17. Satellite TV – Out at sea? “fully stabilized marine satellite TV systems, brings you digital satellite TV entertainment, including HDTV, whether you’re at anchor or offshore” NOT Seen in AMSR-E

  18. Into the Future: extent not so bad, but trend…? • Take / Buy back frequencies near protected bandwidth • Broadcast compression can do more with less • Cluster geostationary satellites to minimize impact • Currently seem spaced evenly over globe • Yaw to face poles (4x/day; 160 times more often than TRMM) • Forward and rear look (like WindSat) • Keep observation bandwidth narrow • example: WindSat wider than AMSR-E @ 18.7 GHz • Avoid trending wider; evaluate making narrower • Deal with it

  19. Geostationary RFI in AMSR-E Marty Brewer Frank Wentz, and Peter Ashcroft Remote Sensing Systems, Santa Rosa, CA • Older News Hotbird and Astra 10.65 GHz RFI Europe • Old News DirecTV 18.7 GHz RFI America (USA) • News Atlantic Bird 4A 10.65 GHz RFI Europe • Future ? ? ? Joint AMSR Science Team Meeting - Arlington, VA, June 26-27, 2009

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