RTTOV-gb is a version of RTTOV developed at CETEMPS for simulating ground-based upward-looking microwave radiometer radiances. The package may be obtained by adding RTTOV-gb to your list of software preferences once you have registered and logged in.
The RTTOV-gb software is NOT maintained or supported by the NWP SAF.
The official RTTOV-gb web page provides resources including coefficient files for RTTOV-gb users. The web page provides an email address which should be used to request new RTTOV-gb coefficient files, report bugs, and obtain support in running RTTOV-gb.