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Geophysical Relationship between Cygnss GNSS-R Bistatic Reflectivity and Smap Microwave Radiometry Brightness Temperature Over Land Surfaces
- Source :
- IGARSS
- Publication Year :
- 2018
- Publisher :
- IEEE, 2018.
-
Abstract
- This work presents an assessment on the correlation between CyGNSS-derived Global Navigation Satellite Systems Reflectometry (GNSS-R) bistatic reflectivity Γ rl and SMAP-derived brightness temperature T B , over land surfaces. This parametric-study is performed as a function of Soil Moisture Content (SMC), and vegetation opacity τ. Several target areas are selected to evaluate potential differentiated geophysical effects on “active” (as many transmitters as navigation satellites are in view), and passive approaches. Although microwave radiometry has potentially a better sensitivity to SMC, the spatial resolution is poor ~ 40 km. On the other hand, GNSS-R bistatic coherent radar footprint is limited by half of the first Fresnel zone which provides about ~ 150 m of spatial resolution (depending on the geometry). The synergetic combination of both techniques could provide advantages with respect to active monostatic Synthetic Aperture Radar (SAR).
- Subjects :
- Synthetic aperture radar
Fresnel zone
010504 meteorology & atmospheric sciences
0211 other engineering and technologies
02 engineering and technology
01 natural sciences
vegetation opacity
law.invention
CyGNSS
Soil Moisture Content (SMC)
law
multi-static radar
Radar
021101 geological & geomatics engineering
0105 earth and related environmental sciences
Radiometer
GNSS-R
SMAP
Geophysics
land
Bistatic radar
GNSS applications
Brightness temperature
Satellite navigation
microwave radiometry
Geology
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium
- Accession number :
- edsair.doi.dedup.....6b60db2e83262b01234cd11f84b4413b