[Wrf-users] wrf-3dvar for radiance

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Hi,everybody 
I am a graduate student of Nanjing Institute of Meteorology in China ,Recently ,my
tutor want me to do some 
researches about direct assimilation of satellite radiance by using of some
numerical model ,I know the WRF model 
gains many distinct achievements include 3d-var's study, So I want to know whether
 WRF 3d-var model can assimilate 
directly the satellite radiance ? whether its 3d-var model include the RTTOV part?
If it does ,How can I carry my work 
on? if it doesnot, which 3d-var model should I use to finish my study about direct
assimilation of satellite radiance ?