A quality of Radio mobile communications with vessels, aircraft and land vehicles is not always
good at their place. However, using satellite we can get precise communication services and exact positioning services wherever mobiles exist, because the radio wave coverage area is greatly spreaded.

In fields of Satellite communication of next generation, more convenient and closer system which unite fixed satellite communicaions, mobile satellite communications and personal satellite communicaions is desired we are developping new systems that easy direct communicaions between a small handy station and mobile station is available, or that such higher frequency as Ka and millimeter wave band is used.

A communication in the univers is very important as a technique which support human space activity in 21th century. we are also developping a new system that data transmission and multimedia transmission is available in the univers.