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NTT Labs has developed compact and lightweight satellite earth stations to provide communication links via specially installed public phones and Internet access points in evacuation and disaster response centers in the event of communications being disrupted by disasters and other emergencies. We developed two types' earth stations. These earth stations are compact and lightweight. They are equipped...
In maritime mobile satellite communications, mechanically controlled tracking systems are used to compensate changes of antenna orientation due to changes of a ship attitude caused by waves or winds of the sea. Orientations of antennas on a ship are limited so that transmitted electromagnetic waves are not affected by structures on the ship. Thus it is allowed to transmit waves when a clearance angle...
In maritime mobile satellite communications, received satellite signal level varies due to direction and motion of a ship. Then sometimes the communications are interrupted, because the receiving satellite signal level decreases when the ship's body shadows the antenna. Thus it is important to evaluate how qualities of satellite communications vary during ship operations. However, precise temporal...
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