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小卫星中最不引人注意的皮型卫星(Picosat),1999年重新被定义为立方体星(CubeSat),即质量为1kg、体积约为10cm×10cm×10cm的正立方体星。由若干颗立方体星可以组成纳型卫星(Nanosat)。近几年来,这2种卫星得到飞速发展,并且在分布式空间系统中获得了非常成功的应用。例如:采用50～100颗立方体星,每颗质量8kg,可以实现全球覆盖,同时还可以获得高空间分辨率(2～3m)和高时间分辨率(重访时间15～45min),其经济成本仅为1亿多美元,相当于目前1颗对地观测大卫星的价钱。
The most unobtrusive Picosat among the small satellites was redefined in 1999 as the CubeSat, a cube of stars with a mass of 1 kg and a volume of about 10 cm x 10 cm x 10 cm. Nanosat can be composed of several cubic stars. In recent years, these two kinds of satellites have witnessed rapid development and have achieved very successful applications in distributed space systems. For example, using 50-100 cubic stars each with a mass of 8kg can achieve global coverage while achieving high spatial resolution (2-3m) and high temporal resolution (15-45min revisit time), and its economic cost Only more than 100 million U.S. dollars, which is equivalent to the current price of a large earth observation satellite.