Studying the vertical structure of cloud is essenti al to make better atmospheric modelings for simulations of the global warming. Cloud observation requires very high sensitivity for radar. Although pulse radar is the mainstream of MMCR (Millimeter Wave Cloud Radar), FMCW radar has some advantages. FMCW signal has high spatial and time resolution, and enables high durability and cost-performance because all of the components are designed with semiconductor devices. The bistatic FMCW Millimeter Wave Cloud Radar created by Engineering of Radio Physics Laboratory at Graduate School of Chiba University is designed to have 20km detection range of reflectivity and doppler velocity. Using this radar, we observed on a research vessel "MIRAI" in large region on the Pacific Ocean and the Arctic Ocean. These long-term observations and other observatin on the ground show good sensitivity of the radar and suggests the possibility ofFMCW cloud radar.
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