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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 ? ? ?