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美国1982年7月16日发射的陆地卫星-4目前己出现了多种问题:太阳电池板电线的断裂使能量损失了50％;主题测绘仪停止向地面发送数据,以及多用途卫星舱里的指令和数据处理主机发生故障。所有这些问题迫使NASA准备紧急发射地面的备份星——陆地卫星-D′,以维持美国的民用遥感能力。同时,为了挽救陆地卫星-4,还准备用航天飞机去回收和修理这颗在轨卫星。陆地卫星-4的太阳电池阵是由四块太阳板组成的。板翼展开后的
Landsat-4, launched by the United States on July 16, 1982, now has a number of problems: the breaking of the solar panel wires has caused a 50% loss of energy; the theme plotter stops sending data to the surface, and the multipurpose satellite cabin Instruction and data processing host has failed. All of these issues have forced NASA to prepare for an emergency launch of the terrestrial backup satellite, Landsat-D, in order to sustain the civilian remote sensing capabilities of the United States. At the same time, in order to save the land satellites -4, also prepared to use space shuttle to recover and repair the orbiting satellite. Landsat -4 solar array is composed of four solar panels. After the expansion of the wing