Teijiro Sakamoto

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A wireless network using high altitude platforms located in the stratosphere is attracting interests as a new network infrastructure. This paper provides the design concept and basic performance of the prototype of onboard digital beamforming (DBF) antenna in Ka band, which achieves quick-response and robust space division multiple access (SDMA) schemes.(More)
The modelling and the control of the web handling systems have been studied for a long time; the correct modelling is necessary in order to design a better control system or to experimentally identify the plant parameters. On the web dynamics itself, lumped parametric expressions may be used to designate a web section between two adjacent drive rolls, and(More)
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