Download - Remote Sensing with Signals of Opportunity
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Remote Sensing with Signals of Opportunity
James L GarrisonSchool of Aeronautics and Astronautics
School of Electrical and Computer Engineering (by courtesy)Division of Environmental and Ecological Engineering
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Objective: Demonstrate land and ocean remote sensing using communication satellite signals
• Heritage – demonstration using navigation (GNSS) signals in L-band
• Recent results – ocean wind sensing with XM radio (S-band signals)• Future/Ongoing: Direct Broadcast (Ku-band) for high-
resolution ocean winds, UHF for deep-penetration soil moisture
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Remote sensing with GNSS Reflections
Soil Tg
Vegetation canopy
PT
PRa GPT
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Remote sensing with GNSS Reflections
(From Chapron and Ruffini, GNSS-R workshop, Barcelona. Photo taken at Le Conquet, Brittany)
Receiver
glistening zone
glistening zone
Fundamental Physics:Rougher surface =
larger distribution in path delays
This phenomenon can easily be observed at sunset:
(water is calm inside the red ellipse)
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XM Radio Bistatic Radar• Ambiguity function – key feature to perform “range-
Doppler mapping”
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Spring 2011 Goal• Research UHF satellite availability and antenna options• Collect raw samples of Ku-band and UHF signals • Generate ambiguity function from raw data –
demonstrating ability to detect and process reflected signal.