A Study on Propagation Characteristics of Spread Spectrum Sound Waves Using a Band-Limited Ultrasonic Transducer. - Akio Yamane; Taketoshi Iyota; Yongwoon Choi; Yuzuru Kubota; Kazuhiro Watanabe (J. Robotics Mechatronics, 2004)

Measurement accuracy on indoor positioning system using spread spectrum ultrasonic waves. - Akimasa Suzuki; Taketoshi Iyota; Yongwoon Choi; Yuzuru Kubota; Kazuhiro Watanabe; Akio Yamane (ICARA, 2009)

Verification of CDMA and accuracy on echo ranging system using spread spectrum ultrasonic signals. - Nobuo Ito; Akimasa Suzuki; Taketoshi Iyota (ICARA, 2011)

Indoor positioning for moving objects using a hardware device with spread spectrum ultrasonic waves. - Yuya Itagaki; Akimasa Suzuki; Taketoshi Iyota (IPIN, 2012)

An information addition technique for indoor self-localization systems using SS ultrasonic waves. - Hiromichi Yoshiga; Akimasa Suzuki; Taketoshi Iyota (IPIN, 2012)

Code division positioning by continuous signals using spread spectrum ultrasonic waves. - Ken Kumakura; Akimasa Suzuki; Taketoshi Iyota (IPIN, 2013)

Accuracy of distance measurements using signal tracking of spread-spectrum ultrasonic waves with CDMA. - Akimasa Suzuki; Ken Kumakura; Yongwoon Choi; Taketoshi Iyota (IPIN, 2014)