Geostationary RFI in AMSR-E

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Presentation transcript:

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

Geostationary RFI @ 10.7 GHz

Geostationary RFI @ 10.7 GHz

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 ►

DirecTV: Frequencies, Power Maps Not available

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

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

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

Excellent Agreement with AMSR-E Observations 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

AMSR-E: Frequency and bandwidth (GHz) 6.925 10.65 18.7 23.8 36.5 89.0 bandwidth (GHz) .350 .100 .200 .400 1.000 3.000 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

Lower power, not near 10.65 GHz

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

www.remss.com/RFI

<- 18.7 GHz | 10.65 GHz ->

<- 18.7 GHz | | 10.65 GHz ->

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

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

extent not so bad, but trend…? 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

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