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

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 MapsNot 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

+ ~10K RFI in AMSR-E 10.65 GHz V

Atlantic Bird 4A Hotbird / Astra

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

Lower power, not near 10.65 GHz

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

“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 ? ? ?