System Design of Cloud Profiling Radar for Earthcare

European and Japanese space agencies plan to launch a satellite called EarthCARE (Earth Clouds, Aerosols and Radiation Explorer). The Cloud Profiling Radar (CPR), which will be the first millimeter-wave Doppler radar in space, is installed on this satellite as a main sensor to observe clouds. This paper describes the outline of the system design of EarthCARE CPR.