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日本邮政省和科学技术厅经过几年的合作研究,现已就建立一个以发射到地球上空约20km的无人驾驶飞机为基地的平流层无线电转播系统,编制出可行性研究报告。目前,日本的无线电通信主要是靠微波中继站或低轨道通信卫星(运行轨道在地球上空80～200km)进行转播的,而拟开发的新型通信系统,其高度处于微波站和通信卫星之间,传输距离比微波站的远,而成本要比通信卫星低。该系统将在10年内研制完成,总投资约150亿日
After several years of collaborative research, Japan’s Ministry of Post and the Office of Science and Technology have now prepared a feasibility study on the establishment of a stratospheric radio broadcasting system based on unmanned aerial vehicles that fly to about 20 km above the Earth. At present, Japan’s radio communications are mainly relayed by microwave relay stations or low-orbit communications satellites (orbits of orbit over 80-200 km above the Earth). However, the proposed new type of communications system, which is highly developed between microwave stations and communications satellites, transmits Distance than the microwave station, and the cost is lower than the communications satellite. The system will be developed within 10 years with a total investment of about 15 billion days