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The Hydrosphere State (HYDROS) MissionThe Hydrosphere State (HYDROS) Mission has been selected for the National Aeronautics and Space Administration (NASA) Earth System Science Pathfinder (ESSP) program. The objectives of HYDROS are to provide frequent, global measurements of surface soil moisture and surface freeze/thaw state. In order to adequately measure these geophysical parameters, a system capable of simultaneously measuring L-Band radiometer brightness temperatures at 40 km resolution and L-Band radar backscatter at 3 km resolution over a very wide swath is required. In addition, these science requirements must be satisfied under the stringent cost-cap imposed on all ESSP missions. As a solution to this challenging set of requirements, a relatively large, six meter, conically-scanning reflector antenna architecture was selected for the mission design. The HYDROS instrument will fly on a General Dynamics SA-200HP spacecraft bus. Although large deployable mesh antennas have been used in communication applications, this will mark the first time such technology is applied in a rotating configuration for high-resolution remote sensing.
Document ID
20070031784
Acquisition Source
Jet Propulsion Laboratory
Document Type
Preprint (Draft being sent to journal)
External Source(s)
Authors
Spence, Michael W.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Njoku, Eni
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Kim, Yunjin
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Entekhabi, Dara
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Doiron, Terence
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Piepmeier, Jeffrey
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Girard, Ralph
(Canadian Space Agency Saint Hubert, Quebec, Canada)
Date Acquired
August 23, 2013
Publication Date
September 28, 2004
Subject Category
Geophysics
Report/Patent Number
AIAA Paper 2004-5956
Distribution Limits
Public
Copyright
Other
Keywords
radar
Hydrosphere State Mission (HYDROS)
hydrology

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