The aeronautical satellite communications system has recently been used at the international level, superseding the current HF communications system. This system has the characteristics of good communication quality and the capability for both data and voice communications. Toshiba has developed modems for satellite communications which demodulate the burst signal under the large Doppler shift and fading phenomena that are peculiar to high-speed mobile communications, in conditions of a low carrier-to-noise-density (C/No) ratio. Toshiba has also delivered aeronautical satellite communications systems incorporating these modems, both domestically and internationally. In the field of aeronautical satellite communications systems, there are strong expectations for the development of application systems including a new-generation air traffic control system.
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