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Hiroaki Togashi Last modified date:2017.05.30

Graduate School
Undergraduate School

Academic Degree
Field of Specialization
Activity recognition, Localization, Intelligent Transportation System
Outline Activities
Researches on localization system and sensing system utilizing wireless backhaul network
Research Interests
  • Researches on localization system and sensing system utilizing wireless backhaul network
    keyword : Sensing system, localization, wireless backhaul
Academic Activities
1. GPS (Global Positioning System) is widely used to estimate positon of objects. However, it cannot accurately estimate which road the vehicle is running such as grade separated crossing, and it cannot estimate vehicular position in tunnel. This paper presents a new position estimation algorithm for moving vehicles based on RFIDs (Radio Frequency IDentifications) placed on roadsides and lane boundaries, and multiple on-car RFID receiver antennas, aiming to overcome these problems. This algorithm employs two novel ideas: (1) compute pair-wise positions of on-car antennas using the RSSI (Received Signal Strength Indication) of all pairs of received RFID signals, and (2) use a dynamic weighting function to assign higher weights to the positions estimated based on RFIDs closer to the receiver antennas. The results obtained from our field experiments indicate that the proposed method achieved 0.7-meter localization accuracy for the position estimation when RFIDs were placed at 0.5-meter intervals and a vehicle has 8-antennas. Analysis of localization accuracy in road-width direction revealed that the proposed method allows a moving vehicle to recognize which lane it is in. This result also indicates that the proposed method reduced error in estimating position to 31-70%, compared to existing methods. .
1. Hiroaki Togashi, Wireless Backhaul-based Sensor Network and its Applications, 2017.03.27.
2. Hiroaki Togashi, Yuki Yamaguchi, Ryuta Abe, Junpei Shimamura, Hiroshi Furukawa, Network-based positioning and pedestrian flow measurement system utilizing densely placed wireless access points, SEVENTH INTERNATIONAL CONFERENCE ON INDOOR POSITIONING AND INDOOR NAVIGATION (IPIN 2016), 2016.11.05.
3. Hiroaki Togashi, Yasuaki Koga, Hiroshi Furukawa, "Criminal Fishing System Based on Wireless Local Area Network Access Points", 2016 IEEE International Conference on Multisensor Fusion and Integration for Intelligent Systems, 2016.09.20.
Membership in Academic Society
  • Information processing Society of Japan