Acronyms ADC A nalog-to- D igital C onverter AIRS A tmospheric I nfra r ed S ounder AMSU A dvanced M icrowave S ounding U nit ATBD A lgorithm T heoretical B asis D ocument ATMS A dvanced T echnology M icrowave S ounder CCA C ircuit C ard A ssembly DN D ata N umber DPLX D i pl e x er EDR E nvironmental D ata R ecord EOS E arth O bserving S ystem EU E ngineering U nit EUMETSAT E uropean O rganization for the E xploitation of M eteorological S atellites GEO GEO location HAMSR H igh A ltitude M MIC S ounding R adiometer HIRS H igh resolution I nfrared R adiation S ounder HKPG H ouse K ee P in G IF I ntermediate F requency IMAS I ntegrated M ultispectral A tmospheric S ounder IMF I nstantaneous M easurement F requency IDPS I nterface D ata P rocessing S egment IR I nfra r ed LO L ocal O scillator LNR L ow- N oise R eceiver MHS M icrowave H umidity S ounder MMIC M onolithic M icrowave I ntegrated C ircuit MSU M icrowave S ounding U nit MUX MU ltiple X er MW M icro W ave MXR M i X e R NASA N ational A eronautics and S pace A dministration NEDT N oise- E quivalent D ifferential T emperature NGES N orthrop G rumman E lectronic S ystems NOAA N ational O ceanic and A tmospheric A dministration NPOESS N ational P olar-orbiting O perational E nvironmental S atellite S ystem NPP N POESS P reparatory P roject PLLO P hase L ocked L ocal O scillator POES P olar-orbiting O perational E nvironmental S atellite PRT P latinum R esistance T图仪质量计q quality a sessment qc q otaly c introl rdr rd a a a a rf ecord rf rf r adio fre ffe rfe r adimeter f ront e nd s s urface s urface a coustict w ave