1. Geostationary RFI in AMSR-E
Marty Brewer
Frank Wentz, and Peter Ashcroft
Remote Sensing Systems, Santa Rosa, CA
Older News Hotbird and Astra GHz RFI Europe
Old News DirecTV GHz RFI America (USA)
News Atlantic Bird 4A 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: ° East Longitude
( RFI from 19° not obvious in eastern Mediterranean; highly consistent with power images shown here. )
▼ Hotbird: 13.0° East Longitude
Astra: ° E ▲
Hotbird: 13.0° E ►

5. DirecTV:
Frequencies,
Power Maps
Not available

6. DiercTV Dish Size / Power Map

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

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

17. 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

19. 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
??? °W
??? °W
10.65
10.60 – 10.70
V - Eutelsat 10.0°E
H - Astra 19.2°E
V - Hot Bird 13.0°E
V - Atlantic Bird 4A at 7.2°W

22. Lower power, not near 10.65 GHz

23. 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

25. < GHz | GHz ->

26. < GHz | | GHz ->

27. 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

28. 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

29. 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 18.7 GHz
Avoid trending wider; evaluate making narrower
Deal with it

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