This thesis analyses the reflectivity measurements acquired by the Cloud Profiling Radar (CPR) onboard the EarthCARE satellite, operated by the European Space Agency (ESA) in collaboration with the Japan Aerospace Exploration Agency (JAXA), and those provided by the Multi-Parameter Phased Array Weather Radar (MP-PAWR), located in the Osaka region, Japan. The main objective is to quantitatively evaluate the level of agreement between the two data sources, identifying the main sources of discrepancy due to instrumental, geometric, and physical factors, and to assess the ability of the phased array radar to accurately represent the vertical structure of clouds and precipitation compared to a spaceborne reference system.