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日本邮政省和科学技术厅经过几年的合作研究,现已就建立一个发射到地球上空约20km的无人驾驶飞机通信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,日本的无线电通信是靠微波中继站或低轨道通信卫星进行转播的,而拟开发的新型通信系统,其高度处于微波站和通信卫星(运行轨道在地球上空80～200km)之间,传输距离比微波站的远,而成本要比通信卫星的低。该系统将在10年内研制完成,总投资约150亿日元,旨在为21世纪提供一种新型的通信系统。
After several years of collaborative research, Japan’s Ministry of Post and the Office of Science and Technology have prepared a feasibility study on the establishment of a stratospheric radio broadcasting system for launching a drones communications base about 20 km above the Earth. At present, Japan’s radio communications are relayed by microwave relay stations or low-orbit communications satellites. The proposed new communication system, which is highly situated between microwave stations and communications satellites (orbital orbits 80-80 km above the Earth), has a transmission distance Far away from the microwave station and at a lower cost than the communications satellite. The system will be developed within 10 years with a total investment of about 15 billion yen to provide a new type of communication system for the 21st century.