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published in(发表于) 2013/12/6 12:19:50
Chang-third today “in recent moon the brakes“， 14th month form a soft landing-Chang， third-brake

Reporter (reporter Porto Recanati) today to become immortal, the third at the close after a 5-day flight to the Moon, will conduct the first important action-brake in recent months, making it captured by the gravitational field of the Moon, enter 100x100 km lunar orbit, becomes a satellite around the moon.

According to Wu Weiren, Chief Designer of China's lunar exploration engineering introduction to become immortal, after the third near the Moon, in recent months the first braking, which is commonly known as "brake", just like driving a car to brake, to stop living. It can be captured by the Lunar gravity field, making Chang, third real satellites flying around the moon. Compared with Chang, first and second, to become immortal, the third in recent months, the brakes are different. First of all, Chang e, third is using a newly developed a variable thrust engine to the brakes and, secondly, Chang e, third once and designed a lunar probe 100x100 km circular orbit, there is difficult. Past goddess, first is to turn into elliptical orbit, orbit into a circular orbit. And this time Chang, third because of restrictions on energy, in particular the propellant is limited, therefore designed this ring Moon orbital flight programme.

Xichang satellite launch Center measurement and control data experts, senior engineers Che Zhuming describes, if the "brake" was late, the satellite hit the Moon and "brake" early satellites will drift off into space. "Brake" success depends critically on the location of the satellites and the velocity vector is correct.

From now on, Chang, third in the rings orbit the Moon is 4 days, then again on December 10 for orbit into elliptical orbits of 100x15 km. Then run 4 days later, on December 14 in the month table a soft landing.

Reporters learned from the Defense Science and Industry Council yesterday, by Yu Change the third spacecraft flight in good condition, originally scheduled for yesterday's mid-course corrections were canceled for the third time. Beijing Aerospace command and control center successfully completed on December 2 and 3rd, respectively first and second mid-course corrections, second first used for mid-course corrections to 7,500 n motor for accurate calibration. In view of the launch of Chang e, third longest three b rocket into orbit with high precision, the previous two mid-course corrections are also very accurate, you can meet the requirements of braking and subsequent orbit control in recent months, while Chang ' e third flight control programme has a good adaptability, through researching, are no longer conducted for mid-course corrections.

(Original title: Chang, third day "in recent months, the brakes")

　　本报讯(记者 雷嘉) 今天，嫦娥三号在经过5天的飞行后接近月球，将进行第一次重要动作——近月刹车，使其被月球的引力场捕获，进入100×100千米的环月圆轨道，成为一颗绕月卫星。

　　据中国探月工程总设计师吴伟仁介绍，嫦娥三号接近月球后，首先要进行近月制动，也就是俗称的“刹车”，就像开汽车一样要刹车，要刹得住。这样才能被月球引力场捕获，使嫦娥三号成为真正绕月飞行的卫星。与嫦娥一号、二号相比，嫦娥三号的近月刹车有所不同。首先，嫦娥三号使用的是新研制的一种变推力发动机来刹车；其次，嫦娥三号一次性地把环月探测设计成一个100×100千米的圆轨道，这里面还是有难度的。过去嫦娥一号是先变成椭圆轨道，再变轨进入圆轨道。而这次嫦娥三号因为能源受到限制，特别是推进剂受到限制，因此设计了这种环月圆轨道飞行方案。

　　西昌卫星发射中心测控数据专家、高级工程师车著明介绍，如果“刹车”晚了，卫星就要撞到月球上去；而“刹车”早了卫星则会飘向太空。“刹车”是否成功，关键取决于卫星当时的位置和速度矢量是否正确。

　　从今天开始，嫦娥三号将在环月圆轨道运行4天，后于12月10日再次变轨，进入100×15千米的椭圆轨道。再运行4天后，于12月14日在月表软着陆。

　　记者昨天从国防科工局获悉，由于嫦娥三号探测器飞行状态良好，原定于昨天进行的第三次中途修正被取消。北京航天飞行控制中心分别于12月2日和3日顺利完成第一次、第二次中途修正，第二次中途修正还对首次使用的7500牛发动机进行了精准标定。鉴于发射嫦娥三号的长三乙运载火箭入轨精度较高，前两次中途修正也非常精准，可以满足近月制动和后续轨道控制的要求，同时，嫦娥三号飞行控制方案具有较好的适应性，经研究决定，不再进行第三次中途修正。

(原标题：嫦娥三号今天将“近月刹车”)

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