SSU > Stratospheric Sounding Unit

 (MI_Instrument) uuid: 8293FAD4B89475F2E040AC8C5AB4576F
    citation:  (CI_Citation)
        title:  NOAA Polar Orbiter Data User's Guide, Section 4.2, SSU Data
        date:  (CI_Date)
            date:  1998-11
            dateType:  (CI_DateTypeCode) publication
        edition:  revision
        identifier:  (MD_Identifier)
            code:  gov.noaa.ngdc.fgdccitation:25179
        citedResponsibleParty:  (CI_ResponsibleParty)
            individualName:  Kidwell, Katherine B. (comp. and ed.)
            role:  (CI_RoleCode) originator
        citedResponsibleParty:  (CI_ResponsibleParty)
            individualName:  DOC/NOAA/NESDIS/NCDC > National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce
            role:  (CI_RoleCode) publisher
    identifier:  (MD_Identifier)
        code:  SSU > Stratospheric Sounding Unit
    type:  sounder
    description:  Instrument Type: sounder, Operational Mode: crosstrack, Collection Type: step-scan, Other Information: The SSU consists of a single primary telescope with a 10 degree IFOV which is step-scanned perpendicular to the satellite subpoint track. Each scan line is composed of eight individual 4.0 second steps and requires a total of 32 seconds, including time for the mirror retrace. The 10 degree IFOV gives a resolution of 147 km at the satellite subpoint and the stepping produces an underlap between adjacent scan lines of approximately 62 km at nadir. A calibration sequence is initiated every 256 seconds (8 scans) during which the radiometer is in turn, stepped to a position to view unobstructed space and an internal blackbody at a known temperature.