A Double Image Acquisition System with Visible and UV LEDs for Citrus Fruit. - Mitsutaka Kurita; Naoshi Kondo; Hiroshi Shimizu; Peter Ling; Paolo D. Falzea; Tomoo Shiigi; Kazunori Ninomiya; Takahisa Nishizu; Kazuya Yamamoto (J. Robotics Mechatronics, 2009)

Sound-Based Ranging System in Greenhouse Environment with Multipath Effect Compensation Using Artificial Neural Network. - Slamet Widodo; Tomoo Shiigi; Naing Min Than; Yuichi Ogawa; Naoshi Kondo (ICONIP (4), 2012)

Moving Object Localization Using Sound-Based Positioning System with Doppler Shift Compensation. - Slamet Widodo; Tomoo Shiigi; Naoki Hayashi; Hideo Kikuchi; Keigo Yanagida; Yoshiaki Nakatsuchi; Yuichi Ogawa; Naoshi Kondo (Robotics, 2013)

Indoor Navigation System by Combining Ultrasonic Wave TOA and Inertial Measurement. - Romprakhun Tientadakul; Hiroaki Nakanishi; Tomoo Shiigi; Zichen Huang; Lok Wai Jacky Tsay; Naoshi Kondo (SICE, 2020)

A Noise Tolerant Spread Spectrum Sound-Based Local Positioning System for Operating a Quadcopter in a Greenhouse. - Zichen Huang; Lok Wai Jacky Tsay; Tomoo Shiigi; Xunyue Zhao; Hiroaki Nakanishi; Tetsuhito Suzuki; Yuichi Ogawa; Naoshi Kondo (Sensors, 2020)

A sound-based positioning system with centimeter accuracy for mobile robots in a greenhouse using frequency shift compensation. - Zichen Huang; Tomoo Shiigi; Lok Wai Jacky Tsay; Hiroaki Nakanishi; Tetsuhito Suzuki; Yuichi Ogawa; Naoshi Kondo (Comput. Electron. Agric., 2021)

Spread Spectrum Sound with TDMA and INS Hybrid Navigation System for Indoor Environment. - Romprakhun Tientadakul; Hiroaki Nakanishi; Tomoo Shiigi; Zichen Huang; Lok Wai Jacky Tsay; Naoshi Kondo (J. Robotics Mechatronics, 2021)