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The HYDROS Radiometer/Radar InstrumentThe science objectives of the HYDROS mission are to provide frequent, global measurements of surface soil moisture and surface freeze/thaw state. In order to adequately measure these geophysical quantities, the key instrument requirements were determined by the HYDROS science team to be: 1) Dual-polarization L-Band passive radiometer measurements at 40 km resolution, 2) Dual-polarization L-Band active radar measurements at 3 km resolution, and 3) A wide swath to insure global three day refresh time for these measurements (1000 km swath at the selected orbit altitude of 670 km). As a solution to this challenging set of instrument requirements, a relatively large, 6 meter, conically-scanning reflector antenna architecture was selected for the instrument design. The deployable mesh antenna is shared by both the radiometer and radar electronics by employing a single L-Band feed.
Document ID
20080017926
Acquisition Source
Jet Propulsion Laboratory
Document Type
Conference Paper
External Source(s)
hdl:2014/40736
Authors
Spencer, 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)
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 24, 2013
Publication Date
September 20, 2004
Subject Category
Geophysics
Distribution Limits
Public
Copyright
Other
Keywords
freeze thaw
soil moisture
radiometer
radar

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