High-precision Acoustic Position Recognition, Time Synchronization, Selective Flickerless Visible Light Communication

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High-precision Acoustic Position Recognition, Time Synchronization, Selective Flickerless Visible Light Communication

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High-precision Acoustic Position Recognition, Time Synchronization, Selective Flickerless Visible Light Communication

Masanori Sugimoto Professor

Faculty of Information Science and Technology

Hokkaido University Researcher Directory

Submillimeter-order position measurement and its deployment

By integrating ranging technology that is more accurate than conventional methods by double digits and original time-synchronization technology using illumination, we can quickly and accurately estimate the 3D position and velocity of mobile terminals and robots. The system also realizes selective flickerless visible light communication and position-dependent information distribution to specific moving objects.

Content of research

To accurately obtain the position of a user in a room or a moving object in real time, we have proposed a high-precision time reference point setting method called the phase-matching method (ranging error of 0.03 mm). Based on this technology, we have developed a smartphone users’ gesture recognition system and a robot tracking system. We have also achieved microsecond-order time synchronization using a camera-equipped mobile terminal and an original algorithm. The integration of LED modulation and terminal location information will allow us to distribute location-dependent information and conduct flickerless visible light communication using indoor lighting.

Gesture recognition by smartphones
Visible light communication with indoor lighting and robot position estimation
Robot tracking system

Potential for social implementation

・Robot navigation, precision measurement, motion capture system, smartphone indoor position recognition, gesture interface, synchronization between multiple cameras, visible light communication

Appealing points to industry and local governments

We have conducted research and development from the theory through the application and implementation, including joint research with companies. It is expected to apply the proposed technology to precision manipulation for industrial robots, the synchronization of multiple cameras to construct multi-view 3D images, and high-speed visible light communication. We aim to realize higher performance technology by challenging interesting real-world issues, including security applications.