Improved landing radio altimeter for unmanned aerial vehicles based on an antenna array. - Ronaldo S. Ferreira; Marco A. M. Marinho; Kefei Liu 001; João Paulo Carvalho Lustosa da Costa; Arthur V. Amaral; Hing-Cheung So (ICUMT, 2012)

Antenna Array Based Positioning Scheme for Unmanned Aerial Vehicles. - Marco A. M. Marinho; Ronaldo S. Ferreira Jr.; João Paulo Carvalho Lustosa da Costa; Edison Pignaton de Freitas; Felix Antreich; Kefei Liu 001; Hing-Cheung So; Rafael Timóteo de Sousa Júnior; Ricardo Zelenovsky (WSA, 2013)