Pedestrian Navigation Based on 3D Map and Mobile Interaction. - Hideaki Maehara; Koji Wakimoto; Satoshi Tanaka; Sumio Usui; Kazuo Kamata (MVA, 2002)

Nation-wide RTK-GPS based on FKP method and applications for human navigation and location based services. - Sumio Usui; Hiroshi Higuchi; Junshiro Kanda; Koji Wakimoto; Satoshi Tanaka; F. Satoh (ICME, 2004)

Network based high accuracy realtime GPS positioning for GCP correction of high resolution satellite imagery. - Hiroshi Higuchi; Masayuki Saito; Tsutomu Iwahashi; Sumio Usui (IGARSS, 2004)

Evaluation of Positioning Accuracy for the Pedestrian Navigation System. - Sumio Usui; Junichiro Tsuji; Koji Wakimoto; Satoshi Tanaka; Junshiro Kanda; Fumiaki Sato; Tadanori Mizuno (IEICE Trans. Commun., 2005)