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天舟一号与天宫二号实施推进剂在轨补加示意图(图片来源于搜狐网)
实现全自主超快速交会对接
交会对接试验相信大家都已不再陌生,早在2011年11月3日凌晨1时35分,天宫一号目标飞行器就已与神舟八号飞船顺利完成我国的首次交会对接。但是,在天舟一号上天前,我国掌握的交会对接技术需要耗时长达两天时间,天舟一号将首次使用自主交会对接技术,可以将以前的两天时间缩短为6个小时,大大减少了过程中的资源消耗,比如轨道资源等。也会进一步提高飞行器在轨飞行的可靠性以及航天员的舒适度,更大程度地保障未来空间站的安全。值得一提的是,自主快速交会对接,需要超远程精确控制能力,可以说,快速交会对接的实现,比针尖对麦芒都更加困难。
天舟一号与天宫二号进行三次对接
实现主动离轨受控陨落
在天舟一号圆满完成自己的各项任务后,它在回来的路上还肩负着最后一项神秘使命。我们知道,一般卫星完成使命后,随着推进剂消耗殆尽,卫星失去动力,运行轨道将会慢慢降低,直到落入大气层被烧毁,在这个过程中,会产生一部分轨道碎片(太空垃圾),包括航天器表面脱落的材料,遗漏出来的液体固体等。这些太空垃圾有可能成为未来航天器的杀手,据统计,与大于10厘米的太空垃圾碰撞或可“杀死”航天器。天舟一号在降落的过程中,将全程经由地面飞行控制人员控制,主动离开既定轨道,坠落在预定的安全海域。天舟一号的受控降落,不仅减少了离轨过程中的不确定因素,而且还避免自身成为太空垃圾,可以为打造洁净安全的太空环境尽了自己最后的一份力。
中国航天事业自1956年创建以来,从无到有,从小到大,从弱到强,经过几代航天人艰苦卓绝的奋斗,我国走出了一条自力更生、自主创新的发展道路。今年的4月24日,中国航天事业发展将迎来61周年的纪念日,同时这也是第二个“中国航天日”。即将出征的“天舟一号”货运飞船是给第二个“中国航天日”最好的献礼。
责任编辑:孙启浩 CN037
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