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Signals of Opportunity P-band Investigation (SNOOPI): Mission Overview and Progress Update
Presenter/PI: James L. Garrison1
Team Members: Rashmi Shah2, Jeffrey Piepmeier3, Manuel A. Vega3, Seho Kim1, Roger Banting3, Juan C. Raymond3,Benjamin Nold1, David A. Spencer1, Kameron Larsen2, R. Bindlish3
1 Purdue University2Jet Propulsion Laboratory, California Institute of Technology3NASA Goddard Space Flight CenterProgram: InVEST-17
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Problem to Solve• Root Zone Soil Moisture (RZSM):
• Water content in 0-1 m of soil• Depth of absorption by plants• Current: L-band Active/Passive Microwave
• Sensitive to only top 0-5 cm• RZSM through model assimilation
• Snow Water Equivalent• Critical role in hydrology and water management• Current: estimates from multi-frequency microwave
• Model spreads of -50% to 250%, - common in mid-latitude regions
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100 cm
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Solution: Signals of Opportunity (SoOp)
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SNOOPI Technical Objectives • Demonstrate signal coherence & link budget at orbital
altitudes• Quantify RFI from space (broad field of view, global
distribution of measurements)• Validated model prediction and instrument tracking for
orbital delay and Doppler
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SNOOPI System Design
July 8, 20203X2 U Cubesat bus
255 MHz Antennas
370 MHz Antennas
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Technical Details: Instrument Development
Low Noise Front End (LNFE) NASA GSFC
Digital Back End (DBE) JPL
Antennas (GOMSPACE)
• Hardware Built• Testing underway
• Functional and performance testing underway
• SW/FW architecture defined
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Technical Details: Mission Design
Science operations Center (SOC) Purdue
SMAP Cal/Val Matchups (15 sites)• SP within 9 km of site mid-point• Direct & reflected visible in same spotbeam• Calibration water body in same spotbeam• Ground not frozen (SMAP Enhanced L3 Freeze/Thaw)Snow Arcs• 30 sec min. 80% snow covered• Snow climatology from MODIS/Terra Monthly L3 Global
Product (MOD10CM)Generation of Representative CONUS “map”
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Technical Details: Mission DesignSMAP Cal/Val Site Matchup: ISS Orbit,1 year.
REMEDHUS(41.29°, -5.46°)
Little River(31.67°, -83.6°)
Walnut Gulch (31.75°, -110.03°)
5 arcs 12 arcs 9 arcs
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Technical Details: Mission DesignSMAP Cal/Val Site Matchup: Modeling Orbital Decay
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Technical Details: Mission DesignSnow Arc: Modeling Orbital Decay
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Technical Details: Mission DesignCONUS coverage
ISS orbit coverage
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Next Steps / Contributions• CDR: Aug 5-13/2020 (4 online sessions)• Delivery: 8/2021• CSLI Launch (earliest): 11/2021• In-orbit commissioning: 12/2021• Instrument Science Experiments 1/22-9/22
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Back Up Slides
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