英语翻译神州七号为什么选择夜间发射?“神舟七号”飞船的发射窗口之所以选择在夜晚而不是白天,最重要的原因是便于飞船发射升空
英语翻译
神州七号为什么选择夜间发射?
“神舟七号”飞船的发射窗口之所以选择在夜晚而不是白天,最重要的原因是便于飞船发射升空时,地面的光学跟踪测量设备易于捕捉到跟踪目标.道理很简单,在漆黑的夜空中,喷射着火焰向太空飞行的载有飞船的火箭非常显眼和突出.
另外还和发射窗口的宽窄有关.据有关专家介绍,航天发射是一项极其复杂和庞大的系统工程,飞船发射时机的选择要考虑到各种各样可能影响到发射的因素,其中,气象因素往往是最关键最直接的决定性因素.在综合考虑判断的基础上,最终确定下来的一天中的某一个时间段会作为飞船发射的时机,这个时间段被称为“发射窗口”.
在九月底之前发射,能够保证阳面出舱,返回时候天还不太黑.按照九月二十五日至三十日这个计划窗口,如果发射时间选择在晚上九时十分左右,可以保证航天员出舱活动在阳照面,返回大概是下午五时四十分,天还不太黑.这样能够保证航天员返回更加安全,也是以人为本的体现.而进入十月份特别是十月中旬以后,发射窗口很窄,不利于发射和回收.此外,秋分前后,太阳活动比较剧烈,对飞船的测控通信也有不利影响.
“神舟”一、二、三、四号飞船的发射时间选择在夜间,主要是因为飞船升空后光学仪器易于跟踪测控.而“神州”五号六号载人飞船的发射时间选择在白天,主要是保证降落时也在白天,便于在紧急状态下航天员逃生和进行地面搜救.看来,神州七号是一个例外.
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神州七号为什么选择夜间发射?
“神舟七号”飞船的发射窗口之所以选择在夜晚而不是白天,最重要的原因是便于飞船发射升空时,地面的光学跟踪测量设备易于捕捉到跟踪目标.道理很简单,在漆黑的夜空中,喷射着火焰向太空飞行的载有飞船的火箭非常显眼和突出.
另外还和发射窗口的宽窄有关.据有关专家介绍,航天发射是一项极其复杂和庞大的系统工程,飞船发射时机的选择要考虑到各种各样可能影响到发射的因素,其中,气象因素往往是最关键最直接的决定性因素.在综合考虑判断的基础上,最终确定下来的一天中的某一个时间段会作为飞船发射的时机,这个时间段被称为“发射窗口”.
在九月底之前发射,能够保证阳面出舱,返回时候天还不太黑.按照九月二十五日至三十日这个计划窗口,如果发射时间选择在晚上九时十分左右,可以保证航天员出舱活动在阳照面,返回大概是下午五时四十分,天还不太黑.这样能够保证航天员返回更加安全,也是以人为本的体现.而进入十月份特别是十月中旬以后,发射窗口很窄,不利于发射和回收.此外,秋分前后,太阳活动比较剧烈,对飞船的测控通信也有不利影响.
“神舟”一、二、三、四号飞船的发射时间选择在夜间,主要是因为飞船升空后光学仪器易于跟踪测控.而“神州”五号六号载人飞船的发射时间选择在白天,主要是保证降落时也在白天,便于在紧急状态下航天员逃生和进行地面搜救.看来,神州七号是一个例外.
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Why Shenzhou VII chose to launch at night?
The most important reason for Shenzhou VII's launch window was chosen at night rather than the daytime is for ground optical tracking equipments easier to capture and track the target.The principle is simple,a backfired rocket which with a spacecraft may be very conspicuous and prominent in the dark sky.
Otherwise,it also relate with the winth of the launch window.According to experts,spaceflight is an extremely large and complex systems engineering.The choice of spacecraft's launch time must considering a wide variety of factors witch may possibly impact on the launch.Thereinto,meteorological factor always be the most crucial and most direct and decisive factor.Base on integrative consideration,a certain period of time in one day will finally fixed for spacecraft's launch time,know as the "launch window".
Launch before the end of September can guarantee to get out the cabin on the sun side and it may not so dark when get back.According to this planed window which from Sep.25 to Sep.30,if the launch time was chosen at about 9:10pm can guarantee cosmonauts' out-cabin activity at the sunshine side,and the time for get back is around 5:40pm when is not too dark.This can guarantee cosmonauts' return more safe which is the embodiment of people foremost.And turns into October especially after mid-October,the launch window may be very narrow and not suit for launch and callback.Moreover,around the autumnal equinox,when the sun's activity became acuity,also has disbennifit for spacecraft's monitoring and control communications.
Shenzhou I,II,III,IV's launch time chose nighttimes mainly for optical tracking equipments easier to track and control.And Shenzhou V,VI's launch time chose daytimes mainly for guarantee there were also daytime when landing,for the best to cosmonauts' escape and ground search and rescue.As it appears,Shenzhou VII is an exception.
The most important reason for Shenzhou VII's launch window was chosen at night rather than the daytime is for ground optical tracking equipments easier to capture and track the target.The principle is simple,a backfired rocket which with a spacecraft may be very conspicuous and prominent in the dark sky.
Otherwise,it also relate with the winth of the launch window.According to experts,spaceflight is an extremely large and complex systems engineering.The choice of spacecraft's launch time must considering a wide variety of factors witch may possibly impact on the launch.Thereinto,meteorological factor always be the most crucial and most direct and decisive factor.Base on integrative consideration,a certain period of time in one day will finally fixed for spacecraft's launch time,know as the "launch window".
Launch before the end of September can guarantee to get out the cabin on the sun side and it may not so dark when get back.According to this planed window which from Sep.25 to Sep.30,if the launch time was chosen at about 9:10pm can guarantee cosmonauts' out-cabin activity at the sunshine side,and the time for get back is around 5:40pm when is not too dark.This can guarantee cosmonauts' return more safe which is the embodiment of people foremost.And turns into October especially after mid-October,the launch window may be very narrow and not suit for launch and callback.Moreover,around the autumnal equinox,when the sun's activity became acuity,also has disbennifit for spacecraft's monitoring and control communications.
Shenzhou I,II,III,IV's launch time chose nighttimes mainly for optical tracking equipments easier to track and control.And Shenzhou V,VI's launch time chose daytimes mainly for guarantee there were also daytime when landing,for the best to cosmonauts' escape and ground search and rescue.As it appears,Shenzhou VII is an exception.
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