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Hurricane Observation Capability of Future Hurricane Imaging Radiometer (HIRAD)

Hurricane Observation Capability of Future Hurricane Imaging Radiometer (HIRAD). Timothy L. Miller 1 , R. Atlas 2 , P. G. Black 3 , R. E. Hood 5 , M. W. James 1 , J. W. Johnson 6 , L. Jones 6 , C. S. Ruf 7 , E. W. Uhlhorn 2 , and Salem Al-Nimri 6 1 NASA/MSFC, Huntsville, AL

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Hurricane Observation Capability of Future Hurricane Imaging Radiometer (HIRAD)

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  1. Hurricane Observation Capability of Future Hurricane Imaging Radiometer (HIRAD) • Timothy L. Miller1, R. Atlas2, P. G. Black3, R. E. Hood5, M. W. James1, J. W. Johnson6, L. Jones6, C. S. Ruf7, E. W. Uhlhorn2, and Salem Al-Nimri6 • 1NASA/MSFC, Huntsville, AL • 2NOAA/AOML, Miami, FL • 3SAIC Inc., Naval Research Laboratory, Monterey, CA • 4USRA, Marshall Space Flight Ctr, Huntsville, AL • 5NOAA, Boulder, CO • 6University of Central Florida, Orlando, FL • 7University of Michigan, Ann Arbor, MI Presented to Interdepartmental Hurricane Conference, March 2009

  2. Univ. of Michigan NASA Univ. of Alabama/Huntsville NOAA Univ. of Central Florida Hurricane Imaging Radiometer (HIRAD) • HIRAD utilizes NASA Instrument Incubator Technology: • Provides unique observations of sea surface wind, temp and rain • Advances understanding / prediction of hurricane intensity • Expands Stepped Frequency Microwave Radiometer capabilities • Uses synthetic thinned array, RFI mitigation technology of Lightweight Rain Radiometer Existing 1980s Technology Simulated Observations Advanced Technology HIRAD in development Government, Academic Team • Timothy Miller, PI, NASA/MSFC Earth Science • Eric Uhlhorn, co-PI, NOAA AOML/Hurricane Research Division • Robbie Hood, NOAA UAV Program Mgr, co-I and former PI • Linwood Jones, University of Central Florida • Christopher Ruf, University of Michigan • NASA/UAH Engineering & Spacecraft Project Management • Peter Black, NRL/SAIC • Robert Atlas, NOAA/AOML 2000 km Swath 70 km • Passive Microwave C-Band Radiometer • Freq: 4, 5, 6 & 6.6 GHz, Version 1 H-pol for ocean wind speed, Version 2 fully polarimetric for ocean wind vectors • 20 km Aircraft Altitude Performance Characteristics • EIA: 0°- 60°, Spatial Resolution: 2-5 km, Swath: ~70 km • Observational Goals: • Wind Speed 10 - >85 m/s Rain Rate 0 - > 100 mm/hr

  3. What is HIRAD?(Hurricane Imaging Radiometer) • Passive C-band radiometer • Objective: To measure strong ocean surface winds through heavy rain from air or space-based platform • With cross-track resolution in addition to along-track • Swath width ~60o (~3 x altitude) • Winds dynamic range: 10 – 100 m/s, through rain up to ~100 mm/hr • Would complement scatterometers and lidars • Technology heritage: • SFMR (Stepped-Frequency Microwave Radiometer) currently flying on reconnaissance aircraft (no cross-track resolution) • NASA Instrument Incubator: Thinned array antenna, along-track real aperture, synthetic cross-track aperture • Status: • Brassboard (bench lab) version of single-polarization (wind speed only) instrument successfully tested in anechoic chamber last August • Single-polarization aircraft instrument to be completed Sept. 2009 • Partnership: • Project leadership, PI, and engineering at NASA/MSFC • Technology, engineering, and science lead partners: NOAA/HRD (Uhlhorn), Univ. Central Florida (Linwood Jones), Univ. Michigan (Chris Ruf), Univ. Alabama Huntsville (project & engineering support)

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