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The Special Sensor Microwave Imager / Sounder (SSMIS) is an 24-channel, 21-frequency, linearly polarized passive microwave radiometer system. The instrument is flown on board the United States Air Force Defense Meteorological Satellite Program (DMSP) F-16, F-17 and F-18 satellites, which became operational in November 2005, March 2008 and March 2010, respectively.〔(【引用サイトリンク】url=http://www.ncdc.noaa.gov/oa/rsad/ssmi/gridded/index.php )〕 It is the successor to the Special Sensor Microwave/Imager (SSM/I). == Instrument characteristics == The SSMIS sensor is a passive conically scanning microwave radiometer that combines and extends the current imaging and sounding capabilities of three previously separate DMSP microwave sensors: the SSM/T-1 temperature sounder, the SSMI/T- 2 moisture sounder, and the SSM/I. The SSMIS instrument measures microwave energy at 24 discrete frequencies from 19 to 183 GHz with a swath width of 1700 km.〔(【引用サイトリンク】url=http://www.ncdc.noaa.gov/oa/rsad/ssmi/swath/ )〕 The first SSMIS was launched aboard the DMSP-16 satellite on 18 October 2003. Due to a manufacturing mistake, the polarization for the channels at 50.3, 52.8, 53.6, 54.4 and 55.5 of the first unit of SSMIS (the one flying on DMSP-16) was reversed. Those five channels detect the VERTICAL polarization rather than the Horizontal polarization detected by the successive units of SSMIS. .〔(between special Sensor Microwave Imager/Sounder and Special Sensor microwave Imager"; B. Yan and F. Weng; IEEE TGRS, 2008, 46, 984 )〕 Table 1: Radiometric characteristics of the SSMIS ().〔(Sensor Microwave Imager and Sounder (SSMIS) Antenna Brightness Temperature Data Record (TDR) Calibration and Validation User Manual"; NOAA/NESDIS; March, 2007 http://www.ncdc.noaa.gov/oa/rsad/ssmi/swath/star-ssmis-tdr-calval-user-manual.pdf (retrieved october 2011) ) 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「SSMIS」の詳細全文を読む スポンサード リンク
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