@prefix ns0: <http://gcmd.gsfc.nasa.gov/kms#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

<https://gcmd.earthdata.nasa.gov/kms/concept/8be17733-c145-421c-b402-bf3fd0797e15>
  ns0:altLabel [ ] ;
  skos:definition """The Advanced Microwave Sounding Unit-B (AMSU-B) is a 5 channel microwave radiometer. The purpose of the instrument is to receive and measure radiation from a number of different layers of the atmosphere in order to obtain global data on humidity profiles. It works in conjunction with the AMSU-A instruments to provide a 20 channel microwave radiometer.

AMSU-B is a cross-track, line scanned instrument designed to measure scene radiances in 5 channels. At each channel frequency, the antenna beam width is a constant 1.1 degrees (at the half power point). Ninety contiguous scene resolution cells are sampled in a continuous fashion, each scan covering 50 degrees on each side of the sub satellite path. These scan patterns and geometric resolution translate to a 16.3 km diameter cell at nadir at a nominal altitude of 850 km.

The AMSU-B instrument consists of a scanning parabolic reflector antenna which is rotated once every 8/3 seconds and focuses incoming radiation into a quasi-optic system which then separates the frequencies of interest into three separate feed horns of the receiver assembly. The receiver subsystem provides further demultiplexing of the 183 GHz signal in order to selectively acquire three defined double sided bands around the 183 GHz signal. 


Group: Instrument_Details
   Entry_ID: AMSU-B
   Group: Instrument_Identification
      Instrument_Category: Earth Remote Sensing Instruments
      Instrument_Class: Passive Remote Sensing
      Instrument_Type: Profilers/Sounders
      Short_Name: AMSU-B
      Long_Name: ADVANCED MICROWAVE SOUNDING UNIT B (AMSU-B)
   End_Group
   Group: Instrument_Associated_Sensors
      Short_Name: AMSU-B
   End_Group
   Group: Associated_Platforms
      Short_Name: NOAA-17
      Short_Name: NOAA-16
      Short_Name: NOAA-15
   End_Group
   Group: Spectral_Frequency_Information
      Wavelength_Keyword: Microwave
      Number_Channels: 5
      Spectral_Frequency_Resolution: 1.1 degree
   End_Group
   Online_Resource: http://www2.ncdc.noaa.gov/docs/klm/html/c3/sec3-4.htm
   Creation_Date: 2008-03-18
End_Group"""@en ;
  skos:prefLabel "AMSU-B"@en ;
  skos:inScheme <https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/instruments> ;
  skos:broader <https://gcmd.earthdata.nasa.gov/kms/concept/4190ebdc-e89a-4f3f-bc74-b2af4c68d009> ;
  a skos:Concept .

<https://gcmd.earthdata.nasa.gov/kms/concept/4190ebdc-e89a-4f3f-bc74-b2af4c68d009>
  skos:prefLabel "Profilers/Sounders"@en ;
  a skos:Concept ;
  skos:narrower <https://gcmd.earthdata.nasa.gov/kms/concept/8be17733-c145-421c-b402-bf3fd0797e15> .