Location Awareness System for Drones Flying Beyond Visual Line of Sight Exploiting the 400 MHz Frequency Band. - Nei Kato; Yoshihiro Kamisawa; Akifumi Kitashima; Yuichi Kawamoto; Akira Aneha; Yuichi Yaguchi; Ryu Miura; Hideki Nakamura; Michihiro Kobayashi; Toshihiko Henmi; Osamu Akimoto (IEEE Wirel. Commun., 2019)