Development of In-vehicle high reliability medical sensor system using ultra wideband impulse radio

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K14991
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 21020:Communication and network engineering-related
• Research Institution: Kagawa University
• Principal Investigator: Li Kun 香川大学, 創造工学部, 助教 (10806483)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 広帯域インパルス / 電磁界解析 / 伝搬モデル / 人体影響

Outline of Final Research Achievements

To develop an intra-vehicle medical wireless system for providing driver health emergency services using ultra-wideband signals, a numerical algorithm for electromagnetic field analysis with high accuracy was constructed for pulse propagation including the frequency dispersion characteristics of the human tissue. An in-vehicle propagation measurement using prototyped ultra-wideband antenna has been carried out considering the shadowing effect of the human body with a typical driving posture. When the receiving antenna attached to various parts of the human body such as the head, chest, wrists, and feet, a relatively large delay diffusion due to the polarization mismatch with the transmitting antenna installed in the car housing is confirmed. The spread of the power delay decreased monotonically as the result of the position of the receiving antenna changing from the upper body to the lower body, corresponding well with the analytical results using the developed numerical algorithm.

Free Research Field

通信・ネットワーク工学

Academic Significance and Societal Importance of the Research Achievements

高速鉄道車両や航空機における屋内無線LANシステムを評価する際、レイトレーシング法と有限時間領域差分法が挙げられる。しかし、幾何光学近似法の解析精度や、時間領域解析法の計算規模などの問題点が存在する。本研究では，これまでの手法とは大きく異なり，電磁界・伝搬アルゴリズムを融合する高精度な時間領域の解析手法を用い，生体組織の周波数分散特性を考慮した汎用性が高い車内無線伝搬パラメータについて検討した。さらに、実車内環境におけるUWB伝搬実験の実施によって解析アルゴリズムの妥当性検証を行うことによって、極端な電波利用環境における新たな医療センサシステムの構築に資することが期待できる。