geostationary rfi in amsr-e marty brewer frank wentz, and peter ashcroft
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Geostationary RFI in AMSR-E Marty Brewer Frank Wentz, and Peter Ashcroft Remote Sensing Systems, Santa Rosa, CA. Older NewsHotbird and Astra10.65 GHz RFIEurope Old NewsDirecTV18.7 GHz RFIAmerica (USA) NewsAtlantic Bird 4A 10.65 GHz RFI Europe Future???. - PowerPoint PPT PresentationTRANSCRIPT
Geostationary RFI in AMSR-E
Marty BrewerFrank Wentz, and Peter Ashcroft
Remote Sensing Systems, Santa Rosa, CA
Joint AMSR Science Team Meeting - Arlington, VA, June 26-27, 2009
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 ? ? ?
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 ►
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
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
Frequency(GHz)
6.925 10.65 18.7 23.8 36.5 89.0
bandwidth (GHz)
.350 .100 .200 .400 1.000 3.000
10.6510.60 – 10.70
http://weather.msfc.nasa.gov/AMSR/instrument_descrip.html - http://www.lyngsat.com
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
18.718.6 – 18.8
??? - DirecTV-10 @ 102.8 °W??? - DirecTV-11 @ 99.2 °W
AMSR-E: Frequency and bandwidth
Ascending passes
AMSR-E L2A:Geostationary_Satellite_Glint_Angle
• AMSR-E: No RFI detected in ascending passes• WindSat: 10.7 GHz RFI near Brazil
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
“fully stabilized marine satellite TV systems, brings you digital satellite TV entertainment, including HDTV, whether you’re at anchor or offshore”
Satellite TV – Out at sea?
NOT Seen in AMSR-E
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 BrewerFrank Wentz, and Peter Ashcroft
Remote Sensing Systems, Santa Rosa, CA
Joint AMSR Science Team Meeting - Arlington, VA, June 26-27, 2009
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 ? ? ?