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目前使用的通信卫星距地面36000公里左右,虽然覆盖面积大,但卫星造价高,发射和能源供给成本都很高。相反,小卫星造价低,易发射,可以在离地面较近的低轨道工作,有效解决静止卫星轨道的利用率问题。 美国最大的移动电话公司和美国软件公司最近协商,成立一个共同开发全球低轨道卫星通信网公司,总投资90亿美元,计划到2000年,在全球低轨道上部署840颗小型卫星,以构成全球最现代化的卫星通信网。 该计划中的全球卫星通信网是将小型通信卫星送入距离地球640多公里的低地球轨道上,每40颗卫星
The communications satellites currently used are about 36,000 kilometers away from the ground. Although the coverage area is large, the cost of satellites is high, and the cost of launching and energy supply is high. In contrast, small satellites are cost-effective and easy to launch and can operate on low orbits that are close to the ground to effectively address the utilization of geostationary orbit. The largest US mobile phone company recently negotiated with US software companies to set up a joint venture to develop a global low-orbit satellite communications network with a total investment of 9 billion U.S. dollars. It plans to deploy 840 small satellites on the global low-orbit by the year 2000 to form a global The most modern satellite communication network. The planned global satellite communications network sends small communications satellites into low Earth orbit, over 640 kilometers away from Earth, with every 40 satellites