Arctic Weather Satellite microwave radiometer

The Arctic Weather Satellite is conceived as a constellation of small polar-orbiting satellites, each carrying a single instrument: a microwave radiometer. As a first step, ESA is developing a prototype satellite. The cross-track scanning microwave radiometer consists of a rotating antenna focusing the incoming radiation onto four feedhorns (one for each group of channels) and four receivers, covering the frequency range 50–325 GHz.