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PPT : CLP Measurement Technologies Passive Microwave

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Cold Land Passive MW Concepts
* Real aperture
o Dual frequency, dual polarization, conical scanning
o 6-m deployable reflector, multiple feedhorns
o Reflector emissivity and spin rate are concern
* 1-D STAR
o Dual frequency, dual (or single) polarization
o 6-m deployable cylindrical reflector
o Nearly constant 50o incidence angle
*2-D STAR
o Single frequency, single polarization
o Three 3-m deployable arms each with 250 elements
o Multiple incidence angles (nadir to >50 degrees)

Red = catchments with <100 pixels at indicated spatial resolution preliminary

Study Approach- Key Parameters
* Three strawman passive concepts were chosen by the CLPWG at the Ann Arbor Meeting (Nov 2002)
* Each is paired with a driving remote sensing science parameter, which directs our investigation

CLP Measurement – Passive Microwave

Technology Development Issues for Real Aperture Concept
* Issues
o Balance and Power Transfer Assembly (BAPTA)
o Active system would be de-spun ( e.g. inside BAPTA)
o Momentum compensation
o Deployment / alignment , thermal stability
* Notes
o “conventional“ concept
o Largest rotating reflector system ever flown for MW instrument
o Lifetime issues with mechanism, will drive spacecraft design

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