GPM GMI update Chris Kidd. RFI issues Two main sources: Reflection from broadcast satellites -...
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![Page 1: GPM GMI update Chris Kidd. RFI issues Two main sources: Reflection from broadcast satellites - affects 18.7 GHz primarily to varying degrees - can be.](https://reader035.fdocuments.us/reader035/viewer/2022062518/56649e355503460f94b24a7f/html5/thumbnails/1.jpg)
GPM GMI update
Chris Kidd
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RFI issues
Two main sources:• Reflection from broadcast satellites - affects 18.7 GHz primarily to varying degrees - can be predicted to some extent• Surface emissions - spurious emissions from surface emitters - affects primarily 6.9 and 10.7 GHz, but also 18.7GHz
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20140305-S061920
V10 H10
V18 H18
secondary RFI – sidelobe/2nd satellite
Strong RFIover ice
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20140307-S060554
V10 H10
V18 H18
Strong RFIfrom ice (?)
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20140309-S0055206
V10 H10
V18 H18
subtle RFI – H channel only
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Broadcast RFI• Ice appears to provide a very good reflector of 18.7
GHz RFI (ice structure?)• Water surfaces more variable – presumably due to
wave orientation• Some land surfaces also reflect – more subtle
• Possible to forward-calculate satellite-surface-satellite path to identify regions of possible RFI
• Obvious RFI is good – subtle RFI is bad.
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Surface RFIPrimarily at 10GHz• Initial study by the Office of Communication, Ofcom,
(UK), found that at 10.67 GHz licenses had been issued within ITC regulations (low-power (mW) motion detection systems).
18 GHz sources• Some broadcast bands, but usually satellite-ground,
occasionally associated with ship-based radars. Mobile phones are <3 GHz, possibly communication links at 18 GHz (Spanish?).
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V10 H10
V18 H18
20140308-S234218
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V10 H10
V18 H18
20140309-S224904
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20140309-S224904
V18
Kartoum
El Obeid
Abu Zabad
Shendi
Wad Medani
Atbara
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GMI quicklook images:
• Daily global asc/desc image• TRMM false-colour scheme• 1/8 degree resolution (2880x1440)
ftp://meso-a.gsfc.nasa.gov/kidd/GMIql
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quick-look_GMI_20140517_dsc.jpg
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16 May 2014
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SSMIS F16 15:00 GMI 15:30 Radar 15:30
MHS N18 16:00 MHS N18 MSPPS 16:00 SSMIS F17 16:00
Precip retrievals 7 April 2014
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Constellation x-track – ideal (!)
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My Best Guess as of 5/9/14GMI Calibration Error over Ocean
Standard10V 3.0K Windsat10H 1.6K "18V 2.5K "18H 0.0K "23V 0.2K "36V -1.3K "36H -1.3K "89V 3.8K Metop A or B89H 4.2K "166V -3.4K "166H -1.4K "±3 --2.0K "±7 -2.9K "
Tom Wilheit 2014
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GMI vs TMI
GMI - TMI double differences
Ver 10v 10h 18v 18h 23v 36v 36h 89v 89h --- --- --- --- --- --- --- --- --- --- V01D 4.3 3.1 3.3 2.7 1.9 2.3 1.2 1.0 1.0 V02A 4.2 3.2 3.1 2.8 1.7 2.1 1.2 0.8 0.9
Rachael Kroodsma (NASA PPS)
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Solar intrusion (V)
Tom Wilheit 2014
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Solar intrusion (H)
Tom Wilheit 2014
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Additional slides…
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20140308-S051249
V10 H10
V18 H18
Strong RFInot ice (?)
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20140311-S040553
V10 H10
V18 H18
Very subtle RFI – V&H channel
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Kidd, 2006
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Kidd, 2006
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20140310-S045852
V10 H10
V18 H18
Strong RFIfrom ice (?)