定点滞空飛行船を用いたデジタル放送実験

概要

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A broadcasting system using a stratospheric platform, which is an air vehicle capable of remaining stationary at an altitude of 20km, has been studied. Advantages of such a system are that it has a wider line-of-site area than a terrestrial system and a shorter propagation distance than a satellite system. However, such air vehicles have not been realized yet. An experiment in which a broadcasting signal is transmitted from a stationary airship at an altitude of 4km is presented. The service area was defined as an area where the angle of elevation to the airship exceeded 10 degrees. A helical antenna was developed to provide higher gain in the oblique direction to distribute power uniformly. Received power was measured and reception using off-the-shelf receivers was verified in two flight tests. Stable reception was confirmed at several receiving points in the service area despite instability immediately below the airship.
社団法人映像情報メディア学会の論文
2007-04-01