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GNSS-RO is a satellite remote sensing technique that uses GNSS (e.g. GPS) measurements received by a low-Earth orbiting satellites to profile the Earth's atmosphere and ionosphere with high vertical resolution and global coverage. 

Due to the success of COSMIC-1, U.S. agencies and Taiwan decided to move forward with a follow-on Global Navigation Satellite System Radio Occultation (GNSS-RO) mission called FORMOSAT-7/COSMIC-2 (COSMIC-2).

COSMIC-2 data processed operationally in near-real time are published daily by 0200 UTC the following day at https://data.cosmic.ucar.edu/gnss-ro/cosmic2/nrt/. 

FORMOSAT-3/COSMIC was launched into a circular low-Earth orbit from the Vandenberg Air Force Base April 15, 2006.

UCAR began demonstrating the potential of using radio occultation to sound Earth's atmosphere in the GPS/MET experiment from 1995 to 1997.

GNSS-R is a satellite remote sensing technique that uses surface-reflected GNSS signals (such as the widely used GPS constellation) to infer information about the Earth's surface.

The COSMIC Data Analysis and Archive Center (CDAAC) is responsible for processing the data received from satellites.