[M-SD35] Future Missions of Satellite Earth Observation

[MSD35-P01] Technology Demonstration of Next-generation Spaceborne Precipitation Radar
-Application to Scanning Doppler Radar-

*Nobuhiro Takahashi¹, Daisuke Joudoi², Kenji Nakamura³, Tomoo Ushio⁴, Kousuke Yamamoto², Moeka Yamaji², Takuji Kubota², Hidekazu Masuda², Kaya Kanemaru⁵ (1.Institute for Space-Earth Environmental Research, Nagoya University, 2.Japan Aerospace Exploration Agency, 3.Dokkyo University, 4.Osaka University, 5.National Institute of Information and Communications Technology)

Keywords:Precipitation observation, Geostationary satellite, Doppler radar

The purpose of this proposal is to demonstrate the technology for future precipitation radar observations from geostationary orbit, as in the previous solicitation. The prototype of the antenna deployment mechanism has been fabricated and its performance has been verified through ground tests. Furthermore, DELIGHT (deployable LIGHtweight planar antenna technology demonstration) is planned as a mission to demonstrate the antenna deployment mechanism on orbit, using the HTV-X1. Nadir Doppler velocity measurements have been planned for EarthCARE/CPR and PMM/KuDPR. In particular, KuDPR will introduce DPCA (displaced phase center antenna) technology, which uses two antennas in the direction of the satellite's movement, to reduce Doppler velocity errors due to the high-speed of satellite motion. Therefore, the development of technology to acquire Doppler velocity not only in the nadir direction but also in the horizontal direction is expected in the future. In addition, we will also study the cost reduction of the antenna.