Low-Cost GNSS-R Altimetry on a UAV for Water-Level Measurements at Arbitrary Times and Locations. - Kaoru Ichikawa; Takuji Ebinuma; Masanori Konda; Kei Yufu (Sensors, 2019)

Sea Surface Height Measurements Using UAV Altimeters with Nadir LiDAR or Low-Cost GNSS Reflectometry. - Kaoru Ichikawa; Jyoushiro Noda; Ryosuke Sakemi; Kei Yufu; Akihiko Morimoto; Hidejiro Onishi; Tanuspong Pokavanich (Remote. Sens., 2024)