The objectives is to calculate the number of communications channels for serious-condition patients in ambulances based on daily emergency operation data. We carried out emergency image transmission using Japan's first mobile geostationary satellite, ETS-V. However, even at an elevation angle of 47 from Tokyo, signals were interfered for more than 60 of the time when traveling westwards in an urban area with buildings or trees on the south side. High Inclined Elliptic satellites such as Tundra or Quasi-Zenith satellite which enable high elevation angles to be achieved were therefore considered as one possibility. Based on the data of the Tokyo metropolitan area, six (6) channels will be needed to give a loss probability is less than 0.02. Assume 50 channels with transmission rates of 6.0 Mbps, that will be required capacity of the transponder of the HEO. The critical data will therefore be sent in real time from ambulances, enabling advance monitoring of patient conditions while in transit. Detailed digital moving images (MFEG-2). Clinical data (ECG, SaO2).
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